A facile transformation of 2-aminochromone to 4-chlorocoumarin and its reaction with ethylenediamine

…, KR Sur, C Bandyopadhyay

Index: Ghosh, Tarun; Sur, Kumar Ranabir; Bandyopadhyay, Chandrakanta Journal of Chemical Research, 2006 , # 10 p. 651 - 654

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Citation Number: 3

Abstract

2-Aminochromones 1a-c and 8a-c are converted into 4-chlorocoumarins 2a-c and 9a-c. On treatment with ethylenediamine, 2a-c produce 2, 3, 4, 5-tetrahydro-7-(2 '-hydroxyphenyl)-1, 4- diazepin-5-one 3a, b and 4-(2-aminoethyl) aminocoumarin 4b, c in ethanol; while in DMF 9a- c give the bis [4-(2-formamidoethyl) aminocoumarins 10a-c.