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C. K. Chan, J. C. N. Ma and T. C. W. Mak, “Synthesis and X-ray structure of methyl 2-oxopyrimido[2,1-b]ben- zothiazole-4-carboxylate from condensation of 2-aminobenzothiazole and dimethyl but-2-ynedioate,” Journal of the Chemical Society, Perkin Transactions 2, No. 8, 1977, pp. 1070-1074.

has been cited by the following article:

• TITLE: A New and Efficient Method for the Synthesis of Pyrimido[2,1-b]Benzothiazole Derivatives

  AUTHORS: Fatemeh Chadegani, Fatemeh Darviche, Saeed Balalaie

  KEYWORDS: 4H-Pyrimido [2, 1-b] Benzothiazole; Tandem Knoevenagel-Michael Reaction; One-Pot Reaction; Green Chemistry

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.2 No.1, March 15, 2012

  ABSTRACT: The one-pot three-component reaction of 2-aminobenzothiazole, benzaldehyde derivatives and β-ketoester, β-diketone or malonate derivatives in solvent-free conditions provides the corresponding pyrimido [2,1-b] benzothiazole derivatives at 60?C in 60% - 72% yields without using any catalyst in an optimistic time.