Wahe H.; Mbafor J.; Nkengfack A.; Fomum Z.; Cherkasov R.; Sterner O.; Doepp D.
(2003)
Conjugate addition of the imino nitrogen of 2-aminobenzothiazoles 1 to the alkyne β-carbon atom of acetylenic acids 2 followed by ring closure gives rise to novel 2H-pyrimido[2,1-b]-benzothiazol-2-ones in good yield.