IJOCInternational Journal of Organic Chemistry2161-4687Scientific Research Publishing10.4236/ijoc.2018.81006IJOC-82843ArticlesBiomedical&Life Sciences Chemistry&Materials Science Synthesis and Spectral Characterization of Novel 2-Pyrazoline and Bis-2-Pyrazoline Containing Quinoline Moiety AllaouaKedjadja1*AbdelmalekBouraiou2RachidMerdes3Unité de Recherche de Chimie de l’Environnement et Moléculaire Structurale, Université des Frères Mentouri, Route de Ain El Bey, Constantine, AlgeriaLaboratoire de chimie Appliquée, Faculté des Mathématiques et de l’Informatique et des Sciences de la Matière, Université de Guelma, Guelma, AlgeriaDépartement de Science de la Matière, Faculté des Science, Université 20 Aout 1955 Skikda, Skikda, Algeria* E-mail:kedjadjaalla@yahoo.fr(AK);1501201808011051143, December 20174, March 2018 7, March 2018© Copyright 2014 by authors and Scientific Research Publishing Inc. 2014This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

Eight new compounds containing in their structures substituted quinoline and pyrazole entity were synthesized in good to excellent yield by cyclocondensation reaction of chalcones and hydrazine hydrate. This reaction was conducted in formic acid in presence of BF3·Et2O or in acetic acid. These approaches were extended to bis-chalcones, which delivered functionalized bispyrazolines. The structures of the prepared compounds were confirmed by IR, 1HNMR, 13CNMR and mass spectral analysis.

Pyrazoline Chalcone Quinoline Cyclocondensation1. Introduction

This quinoline nucleus is an important class of heterocyclic structure found in many synthetic and natural occurring products with a wide range of pharmacological activities [1] , such as antiviral [2] , antimalarial [3] , anticancer [4] , antibacterial [5] , antifungal [6] , antiobesity [7] and anti-inflammatory [8] . These properties are well illustrated by a large number of commercially available drugs containing this heterocyclic system. The α, β-unsaturated ketones (chalcones) are found as naturally-occurring compounds and are considered to be the precursors of flavonoids and is of lavonoids. Chalcones are important targets medicinal chemistry due to their useful biological activities such as anti-inflammatory [9] [10] [11] , antimitotic [12] , anti-leishmanial [13] , anti-invasive [14] [15] , anti-tuberculosis [16] , anti-fungal [17] , anti-malarial [18] [19] , anti-tumor and anti-oxidant properties [20] , as well as their recognized synthetic utility in the preparation of pharmacologically-interesting heterocyclic systems.

In other hand, pyrazolines have also been primarily studied owing to their pharmacological activities, which include anti-tumor [21] , anti-inflammatory [22] , anti-parasitic [23] , anti-depressive, anticonvulsant [24] , antimicrobial [25] , antitubercular [26] and nitric oxide synthase inhibitors, associated with diseases such as Alzheimer, Huntington, and inflammatory arthritis [27] .

Numerous research programs have been devoted to the establishment of new synthetic methods and new heterocyclic combination because several biological active compounds contain a heterocyclic moiety as a fundamental subunit. In this context, we present in this paper an efficient and convenient protocol for the synthesis of novel 2-pyrazoline and bis-2-pyrazoline. These compounds were prepared by cyclocondensation of chalcones and bis-chalcones in presence of hydrazine hydrate. The new prepared compounds will contain both quinoline and pyrazoline moieties.

2. Experimental2.1. Material and Methods

Melting points of prepared compounds were determined in open capillary tube M.P. apparatus expressed in ˚C and were uncorrected. Chemicals and solvents were of highest purity commercially available. All IR spectra were performed on Shimadzu FT-IR-8201 PC spectrophotometer. 1H-NMR and 13C-NMR spectra were recorded on Brüker Avance 250 and 500 spectrometers. Chemical shifts are given in ppm and J values in Hertz (Hz). Mass spectra were recorded on a Shimadzu GCMS-QP2010. Low resolution mass spectra were recorded on Agilent 5975B inert Series GC/MS System. Column chromatography was performed on Merck silica gel (60, particle size 0.063 - 0.2 mm). Thin-layer chromatography (TLC) was carried out on precoated Merck silica-gel aluminium sheets 60 F254.

2.2. Synthesis2.2.1. General Procedure for the Synthesis of Quinolines (1) and Chalcones (2)

Substituted 3-Acetyl-2-methylquinoline derivatives 1a and 1b have been prepared in accordance with established methods [28] . Spectroscopic results and physical properties are in agreement with literature reports [29] [30] . Chalcones 2a and 2b prepared from the method reported in literature [30] and their structures have been confirmed by spectroscopic methods.

2.2.2. General Procedure for the Synthesis of Bis-Chalcones (3)

A solution of terephthalaldehyde (0.01 mol) and substituted quinoline1 (0.02 mol) in 20 ml of alcohol, were added slowly 0.02 mol sodium hydroxide solution. The mixture was stirred magnetically for 6 hr. Then the mixture was poured slowly into ice (200 g) and the solution was adjusted to pH ~ 2 by HCl (1 N) with constant stirring then kept in refrigerator for 12 hours. The precipitate obtained filtered, washed and recrystallized from chloroform/ethyl acetate mixture (ratio 1/1).

(2E,2’E)-1,1’-Bis(2-methyl-4-phenylquinolin-3-yl)-3,3’-(1,4-phenylene)diprop-2-en-1-one (3a): White solid, Yield = 84%, m.p > 280˚C, IR (KBr, cm−1): 1604.7 (C=O). 1H-NMR (500 MHz, CDCl3, δ ppm, JHz): 8.10 (d, J = 8.9, 2H, H-8), 7.90 - 7.20 (m, 20H, H-Ar), 7.08 (d, J = 16.2, 2H, Hβ), 6.68 (d, J = 16.2, 2H, Hα), 2.70 (s, 6H, 2CH3); 13C-NMR (125.7 MHz, CDCl3, δ ppm): 196.79 (2CO), 155.22, 146.17, 144.84, 144.64, 136.31, 134.46, 133.12, 132.57, 131.16, 130.58, 129.92, 128.98, 128.79, 128.64, 128.56, 126.01, 125.04 (C, CH), 21.05 (2CH3).

(2E,2’E)-1,1’-Bis(6-chloro-2-methyl-4-phenylquinolin-3-yl)-3,3’-(1,4-phenylene)diprop-2-en-1-one [31] (3b): Yellow needles, Yield = 75%, m.p > 280˚C, IR (KBr, cm−1): 1604.7 (C=O). 1H-NMR (500 MHz, CDCl3, δ ppm, JHz): 8.10 (d, J = 8.9, 2H, H-8), 7.90 - 7.20 (m, 18H, H-Ar), 7.10 (d, J = 16.2, 2H, Hβ), 6.68 (d, J = 16.2, 2H, Hα), 2.70 (s, 6H, 2CH3), 13C-NMR (125.7 MHz, CDCl3, δ ppm): 198.04 (2CO), 156.20, 147.10, 145.75, 145.56, 137.17, 135.31, 133.97, 133.41, 131.99, 131.40, 130.74, 129.80, 129.60, 129.45, 129.37, 126.81, 125.83 (C, CH), 21.18 (CH3).

2.2.3. General Procedure for the Synthesis of Pyrazolines (4)

A mixture of chalcones 2 (1.71 mmol), boron trifluoride diethyl etherate (3 drops) and hydrazine hydrate (1.80 mmol) in DMF (5 mL), was heated to reflux for 6 h. Formic acid (10 mL) was added to the reaction mixture and the refluxing was further continued for 2 h. After cooling, the adding of crushed ice precipitated a solid which was filtered and washed thoroughly with water and dried at ambient temperature. The residue was subjected to column chromatography (silica gel, eluent: CHCl3) to afford pure products 4.

3-(2-Methyl-4-phenylquinolin-3-yl)-5-phenyl-4,5-dihydro-1H-pyrazole-1-carbaldehyde (4a): Yellow powder, Yield = 86%, m.p. = 204˚C, IR (KBr, cm−1): 1684.1 (C=O), 1620.8 (C=N), 1582.4 (C=C). 1H-NMR (500 MHz, CDCl3, δ ppm, JHz): 8.58 (s, 1H, CHO), 7.72 (d, J = 8.3 Hz, 1H, H-8), 7.55 (d, J = 8.3 Hz, 1H, H-5), 7.40 - 7.05 (m, 10H, H-Ar), 6.85 - 6.75 (m, 2H, H-Ar), 5.29 (dd, J = 11.9 Hz, J = 5.1 Hz, 1H, H-5 pyrazoline), 3.85 (dd, J = 18.6 Hz, J = 12.0 Hz, 1H, H-4 pyrazoline), 3.16 (dd, J = 18.5 Hz, J = 5.1 Hz, 1H, H-4' pyrazoline), 2.22 (s, 3H, CH3). 13C-NMR (125.7 MHz, CDCl3, δ ppm): 162.50 (CHO), 155.25 (C=N, C2 quinoline), 146.20 (C=N, C3 pyrazoline), 144.86, 144.67, 136.33, 134.48, 133.15, 132.60, 131.19, 130.60, 129.94, 129.00, 128.81, 128.66, 128.58, 126.03, 125.06, (C, CH phenyl and quinoline, 20C), 60.40 (CH, C5 pyrazoline), 45.55 (CH2, C4 pyrazoline), 23.96 (CH3). MS (EI): m/z 391 (M+, 100), 363 (64), 339 (17), 327 (10), 312 (18), 290 (78), 270 (48), 117 (25), 103 (15), 91 (26), 77 (43), 65 (28), 51 (22).

3-(6-chloro-2-Methyl-4-phenylquinolin-3-yl)-5-phenyl-4,5-dihydro-1H-pyrazole-1-carbaldehyde (4b): Yellow powder, Yield = 92%, m.p. = 212˚C, IR (KBr, cm−1): 1684.1 (C=O), 1620.8 (C=N), 1582.4 (C=C). 1H-NMR (500 MHz, CDCl3, δ ppm, JHz): 8.60 (s, 1H, CHO), 7.72 (d, J = 8.3 Hz, 1H, H-8), 7.50 - 7.05 (m, 10H, H-Ar), 6.90 - 6.70 (m, 2H, H-Ar), 5.35 (dd, J = 11.9 Hz, J = 5.1 Hz, 1H, H-5 pyrazoline), 3.84 (dd, J = 18.6 Hz, J = 12.0 Hz, 1H, H-4 pyrazoline), 3.16 (dd, J = 18.5 Hz, J = 5.1 Hz, 1H, H-4' pyrazoline), 2.84 (s, 3H, CH3). 13C-NMR (125.7 MHz, CDCl3, δ ppm): 161.82 (CHO), 156.20 (C=N, C2quinoline), 147.10 (C=N, C3pyrazoline), 145.75, 145.56, 137.7, 135.31, 133.97, 133.41, 131.99, 131.40, 130.74, 129.80, 129.60, 129.45, 129.37, 126.81, 125.83, (C, CH phenyl and quinoline, 20C), 63.97 (CH, C5 pyrazoline), 45.83 (CH2, C4 pyrazoline), 24.11 (CH3).

2.2.4. General Procedure for the Synthesis of Pyrazolines (5)

A mixture of chalcones 2 (1.71 mmol), hydrazine hydrate (1.8 mmol) and acetic acid (10.0 mL) was heated under reflux for 6 h until complete consumption of the chalcone (TLC control). After cooling, the resulting solution was neutralized with concentrate ammonium hydroxide. Then, the adding of crushed ice to the solution precipitated a solid which was filtered and washed with water. Pure compounds 5 was obtained by crystallization from chloroform/ethyl acetate mixture (1:2).

1-[3-(2-methyl-4-phenylquinolin-3-yl)-5-(phenyl)-4,5-dihydro-1H-pyrazole-1-yl]ethanone (5a):White powder, Yield = 87%, m.p. = 212˚C, IR (KBr, cm−1): 1674.1 (C=O), 1620.1 (C=N), 1581.5 (C=C). 1H-NMR (250 MHz, CDCl3, δ ppm, JHz): 8.13 (d, J = 8.3 Hz, 1H, H-8), 7.75 (td, J = 8.3 Hz, J = 1.8 Hz, 1H, H-7), 7.53 - 7.25 (m, 10H, H-Ar), 6.90 - 6.84 (m, 2H, H-Ar), 5.35 (dd, J = 11.9 Hz, J = 5.1 Hz, 1H, H-5 pyrazoline), 3.44 (dd, J = 18.6 Hz, J = 12.0 Hz, 1H, H-4 pyrazoline), 2.82 (s, 3H, CH3), 2.53 (dd, J = 18.5 Hz, J = 5.1 Hz, 1H, H-4' pyrazoline), 2.18 (s, 3H, CH3). 13C-NMR (62.9 MHz, CDCl3, δ ppm): 172.50 (CO), 156.57 (C=N, C2 quinoline), 153.82 (C=N, C3 pyrazoline), 148.28, 147.55, 141.62, 135.77, 130.40, 130.09, 129.64, 128.87, 128.70, 128.57, 127.54, 126.58, 126.42, 125.80, 125.62, 124.74 (C, CH phenyl and quinoline, 20C), 59.69 (CH, C5 pyrazoline), 46.51 (CH2, C4 pyrazoline), 27.83 (CH3), 24.81 (CH3). MS (EI): m/z 405 (M+, 100), 390 (29), 362 (32), 322 (10), 286 (79), 221 (19), 213 (46), 198 (21), 170 (20), 142 (10), 110 (19), 70 (8), 22 (14).

1-[3-(6-chloro-2-methyl-4-phenylquinolin-3-yl)-5-(phenyl)-4,5-dihydro-1H-pyrazole-1-yl]ethanone (5b): Yellow powder, Yield = 82%, m.p. = 223˚C, IR (KBr, cm−1): 1682.4 (C=O), 1623.8 (C=N), 1585.2 (C=C). 1H-NMR (250 MHz, CDCl3, δ ppm, JHz): 8.18 (d, J = 8.3 Hz, 1H, H-8), 7.79 (dd, J = 8.3 Hz, J = 1.8 Hz, 1H, H-7), 7.50 - 7.20 (m, 9H, H-Ar), 6.90 - 6.80 (m, 2H, H-Ar), 5.32 (dd, J = 11.9 Hz, J = 5.1 Hz, 1H, H-5 pyrazoline), 3.42 (dd, J = 18.6 Hz, J = 12.0 Hz, 1H, H-4 pyrazoline), 2.80 (s, 3H, CH3), 2.51 (dd, J = 18.5 Hz, J = 5.1 Hz, 1H, H-4ʹ pyrazoline), 2.75 (s, 3H, CH3). 13C-NMR (62.9 MHz, CDCl3, δ ppm): 171.08 (CO), 155.02 (C=N, C2 quinoline), 151.65 (C=N, C3 pyrazoline), 147.78, 146.91, 145.61, 135.27, 134.14, 132.70, 131.03, 130.30, 130.10, 129.03, 128.92, 128.70, 128.48, 126.65, 126.45, 125.40 (C, CH phenyl and quinoline, 20C), 59.82 (CH, C5 pyrazoline), 46.23 (CH2, C4 pyrazoline), 28.51 (CH3), 23.99 (CH3).

2.2.5. General Procedure for the Synthesis of Bis-Pyrazolines (6)

A mixture of bis-chalcones 3 (0.96 mmol), boron trifluoride diethyl etherate (3 drops) and hydrazine hydrate (2.0 mmol) in DMF (8 mL) was refluxed for 6 h. Formic acid (12 mL) was added to the reaction mixture and the refluxing was further continued for 2 h. After cooling, the adding of crushed ice precipitated a solid which was filtered and washed thoroughly with water and dried at ambient temperature. The residue was subjected to column chromatography (silica gel, eluent: CHCl3) to afford pure products 6.

1,1'-{1,4-phenylenebis [3-(2-methyl-4-phenylquinolin-3-yl)-4,5-dihydro-1H-pyrazole-5,1-diyl]}dicarbaldehyde (6a):Yellow solid, Yield = 86%, m.p. ˃ 280˚C, IR (KBr, cm−1): 1689.5 (C=O), 1620.1 (C=N), 1581.5 (C=C). 1H-NMR (250 MHz, CDCl3, δ ppm, JHz): 8.90 (s, 2H, 2CHO), 8.66 (d, J = 8.4 Hz, 2H, H-8 quinoline), 8.28 (dd, J = 8.4 Hz, J = 1.7 Hz, 2H, H-7 quinoline), 8.07 - 7.91 (m, 10H, H-Ar), 7.87 - 7.79 (m, 4H, H-Ar), 7.24 (s, 4H, phenylene), 5.86 (dd, J = 12.0 Hz, J = 5.0 Hz, 2H, H-5 pyrazoline), 3.64 (dd, J = 18.4 Hz, J = 12.0 Hz, 2H, H-4 pyrazoline), 3.36 (s, 6H, 2CH3), 2.98 (dd, J = 18.4 Hz, J = 5.0 Hz, 2H, H-4' pyrazoline). 13C-NMR (62.9 MHz, CDCl3, δ ppm): 159.44 (2CHO), 156.55 (2C=N C2 quinoline), 154.07 (2C=N, C3 pyrazoline), 148.43, 147.52, 140.72, 135.67, 130.48, 130.02, 129.60, 128.87, 128.76, 128.65, 126.64, 126.48, 126.04, 125.80, 124.68 (C, CH phenyl and quinoline, 34C), 59.28 (2CH, C5 pyrazoline), 46.30 (2CH2, C4 pyrazoline), 24.87 (2CH3). MS (EI): m/z 704 (M+, 100), 652 (19), 648 (78), 598 (31), 556 (13), 494 (62), 445 (17), 398 (19), 358 (21), 306 (15), 256 (11), 200 (10), 173 (8), 120 (9), 38 (10).

1,1'-{1,4-phenylenebis [3-(6-chloro-2-methyl-4-phenylquinolin-3-yl)-4,5-dihydro-1H-pyrazole-5,1-diyl]}dicarbaldehyde (6b): White powder, Yield = 78%, m.p. > 280˚C, IR (KBr, cm−1): 1689.5 (C=O), 1620.1 (C=N), 1581.5 (C=C). 1H-NMR(250 MHz, CDCl3, δ ppm, JHz): 8.98 (s, 2H, 2CHO), 8.50 (d, J = 8.4 Hz, 2H, H-8 quinoline), 8.28 (dd, J = 8.4 Hz, J = 1.7 Hz, 2H, H-7 quinoline), 8.10 - 7.70 (m, 14H, H-Ar), 7.24 (s, 4H, phenylene), 5.85 (dd, J = 12.0 Hz, J = 5.0 Hz, 2H, H-5 pyrazoline), 3.65 (dd, J = 18.4 Hz, J = 12.0 Hz, 2H, H-4 pyrazoline), 3.34 (s, 6H, 2CH3), 2.96 (dd, J = 18.4 Hz, J = 5.0 Hz, 2H, H-4' pyrazoline). 13C-NMR (62.9 MHz, CDCl3, δ ppm): 160.14 (2CHO), 156.20 (2C=N, C2 quinoline), 155.61 (2C=N, C3 pyrazoline), 149.82, 147.65, 142.21, 138.93, 135.19, 132.36, 131.07, 129.99, 129.56, 128.91, 127.67, 127.50, 126.79, 125.94, 121.73 (C, CH phenyl and quinoline, 34C), 59.67 (2CH, C5 pyrazoline), 47.23 (2CH2, C4 pyrazoline), 21.73 (2CH3). HRMS (ESI) m/zcalcd for C46H34Cl2N6O2 [M+Na]+ = 795.2054, found 795.2018.

2.2.6. General Procedure for the Synthesis of Bis-Pyrazolines (7)

A mixture of bis-chalcones 3 (0.96 mmol), hydrazine hydrate (2 mmol) and acetic acid (10.0 mL) was heated under reflux for 6 h. After cooling, the resulting solution was neutralized with concentrate ammonium hydroxide. The adding of crushed ice to the solution precipitated a solid which was filtered and washed with water. Pure compounds 7 was obtained by crystallization from chloroform/ ethyl acetate mixture (1:1).

1,1'-{1,4-phenylenebis [3-(2-methyl-4-phenylquinolin-3-yl)-4,5-dihydro-1H-pyrazole-5,1-diyl]}diethanone(7a):Brown solid,Yield = 73%,m.p.˃280˚C, IR (KBr, cm−1): 1666.4 (C=O), 1620.1 (C=N), 1581.5 (C=C). 1H-NMR (500 MHz, DMSO-d6, δ ppm, JHz): 8.20 (d, J = 8.4 Hz, 2H, H-8 quinoline), 8.00 (dd, J = 8.4 Hz, J = 1.7 Hz, 2H, H-7 quinoline), 7.80 - 7.30 (m, 14H, H-Ar), 7.12 (s, 4H, phenylene), 5.70 (dd, J = 12.0 Hz, J = 5.0 Hz, 2H, H-5 pyrazoline), 3.64 (dd, J = 18.4 Hz, J = 12.0 Hz, 2H, H-4 pyrazoline), 3.30 (s, 6H, 2CH3), 2.88 (dd, J = 18.4 Hz, J = 5.0 Hz, 2H, H-4' pyrazoline), 2.50 (s, 6H, 2CH3). 13C-NMR(125.7 MHz, DMSO-d6, δ ppm): 169.40 (2CO), 159.40 (2C=N, C2 quinoline), 158.80 (2C=N, C3 pyrazoline), 144.30, 142.80, 140.70, 137.10, 132.50, 129.70, 128.80, 128.60, 126.40, 126.00, 125.80, 124.60, 123.40, 118.80 (C, CH phenyl and quinoline, 34C), 60.10 (2CH, C5 pyrazoline), 45.70 (2CH2, C4 pyrazoline), 27.30 (2CH3), 24.60 (2CH3). MS (EI): m/z 732 (M+, 100), 702 (77), 646 (32), 591 (23), 568 (72), 492 (21), 447 (20), 394 (19), 368 (12), 286 (14), 223 (12), 124 (14), 68 (19).

1,1'-{1,4-phenylenebis [3-(6-chloro-2-methyl-4-phenylquinolin-3-yl)-4,5-dihydro-1H-pyrazole-5,1-diyl]}diethanone (7b): Yellow solid, Yield = 81%, m.p. > 280˚C, IR (KBr, cm−1): 1639.4 (C=O), 1620.1 (C=N), 1566.1 (C=C). 1H-NMR(500 MHz, DMSO-d6, δ ppm, JHz): 8.20 (d, J = 8.4 Hz, 2H, H-8 quinoline), 8.08 (dd, J = 8.4 Hz, J = 1.7 Hz, 2H, H-7 quinoline), 7.80 - 7.30 (m, 10H, H-Ar), 7.12 (s, 4H, phenylene), 5.76 (dd, J = 12.0 Hz, J = 5.0 Hz, 2H, H-5 pyrazoline), 3.64 (dd, J = 18.4 Hz, J = 12.0 Hz, 2H, H-4 pyrazoline), 3.36 (s, 6H, 2CH3), 2.88 (dd, J = 18.4 Hz, J = 5.0 Hz, 2H, H-4' pyrazoline). 13C-NMR (125.7 MHz, DMSO-d6, δ ppm): 169.78 (2CO), 157.36 (2C, C2 quinoline), 155.3 (2C, C3 pyrazoline), 148.99, 146.83, 141.42, 138.16, 134.44, 131.62, 130.34, 129.57, 128.84, 128.19, 126.99, 126.79, 126.09, 125.24 (C, CH phenyl and quinoline, 34C), 60.96 (2CH, C5 pyrazoline), 46.13 (2CH2, C4 pyrazoline), 26.47 (2CH3), 21.61 (2CH3). HRMS (ESI) m/zcalcd for C48H38Cl2N6O2 [M+Na]+ = 823.2331, found 823.2348.

3. Result and Discussion

Attempts have been made for the synthesis of N-acetyl substituted pyrazoline derivatives by reaction of hydrazine with chalcones possessing quinoline group. The routes to the target compounds 2, 3, 4, 5, 6 and 7 are shown in Schemes 1-3. 3-phenyl-1-(substitutedquinolin-3-yl)-2-propen-1-one (2a-b) and (2E, 2’E)-1,1’-bis(substitutedquinolin-3-yl)-3,3’-(1,4-phenylene)diprop-2-en-1-one (3a-b) were obtained via Claisen-Schmidt condensation from benzaldehyde and terephthalaldehyde using sodium hydroxide (NaOH) as catalyst in ethanol. The result is excellent in terms of yield and product purity. Pyrazolines (4a-b and 5a-b) and bis-pyrazolines (6a-b and 7a-b) were obtained in a one-pot multicomponent reaction of chalcones2 and 3 in presence of hydrazine hydrate in

Scheme 1. Synthesis of chalcones 2 and bis-chalcones 3.

Scheme 2. Synthesis of new N-formylpyrazolines 4 and N-acetyl pyrazolines 5.

Scheme 3. Synthesis of new bis-N-formylpyrazolines 6 and bis-N-acetyl pyrazolines 7.

formic acid or acetic acid. Six hours suffice for complete conversion of the starting materials. It should be noted that BF3∙Et2O is required for the conversion of starting materials 2 and 3 to pyrazolines 4 and 6, respectively. All prepared compounds were isolated in good to excellent yields and were characterized by IR, 1HNMR, 13CNMR and mass spectral data. The method of preparation of these compounds is very straightforward and free of tedious work up as well is quite time saving.

4. Conclusion

In conclusion, we have developed an efficient and convenient protocol for the synthesis of novel 2-pyrazoline and bis-2-pyrazoline containing quinoline moiety. The reactions of chalcones and bis-chalcones with hydrazine were carried out at reflux of formic acid in presence of BF3∙Et2Oor acetic acid without the requirement for an additional catalyst and afforded the desired products from good to excellent yields and in short reaction times. This approach allows a diverse range of compounds to be prepared in good yields, the pharmacological actions of these remaining to be investigated.

Acknowledgements

We thank Ministère de 1’Enseignement Supérieur et de la Recherche Scientifique for financial support.

Cite this paper

Kedjadja, A., Bouraiou, A. and Merdes, R. (2018) Synthesis and Spectral Characterization of Novel 2-Pyrazoline and Bis-2-Pyrazoline Containing Quinoline Moiety. International Journal of Organic Chemistry, 8, 105-114. https://doi.org/10.4236/ijoc.2018.81006

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