Abstract

A series of novel azetidinones 5a-i have been synthesized by cyclocondensation of various Schiff bases of coumarin with chloro acetyl chloride in presence of triethyl amine. The reaction of 4-hydroxy coumarin with POCl3 yielded 4-chloro coumarin 2 and 4-chloro-3, 4', 3', 4

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