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S. T. Tu, Y. Gao, C. Guo, D. Shi and Z. Lu, “A Conven- ient Synthesis of 2-Amino-5,6,7,8-tetrahydro-5-oxo-4- aryl-7,7-dimethyl-4H-benzo-[b]-pyran-3-carbonitrile under Microwave Irradiation,” Synthetic Communications, Vol. 32, No. 14, 2002, pp. 2137-2141. Hdoi:10.1081/SCC-120005420

has been cited by the following article:

• TITLE: KF-Al2O3 as an Efficient and Recyclable Basic Catalyst for the Synthesis of 4H-Pyran-3-carboxylates and 5-Acetyl-4H-pyrans

  AUTHORS: Iadeishisha Kharbangar, Md. Rumum Rohman, Hormi Mecadon, Bekington Myrboh

  KEYWORDS: 4H-Pyran derivatives; Ethanol; KF-Al2O3; Room Temperature; Three-Component

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.2 No.3, September 28, 2012

  ABSTRACT: KF-Al2O3 as a recyclable basic catalyst for the three-component synthesis of 4H-pyran derivatives by the reaction of aldehydes, malononitrile and active methylene dicarbonyl compounds in ethanol at room temperature is described. The protocol is environmentally benign and offers rapid access to a wide array of 4H-pyran heterocycles in good to excellent yields.