Heterocycles

A convenient synthesis of a simple coumarin from salicylaldehyde and wittig reagent (I): a synthesis of methoxy-and hydroxycoumarins

T Harayama, K Katsuno, H Nishioka, M Fujii, Y Nishita…

Index: Heterocycles, , vol. 39, # 2 p. 613 - 622

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Citation Number: 29

Abstract

Reaction of methoxy- and hydroxysalicylaldehydes (1) with phosphorane in diethylaniline under reflux gave only coumarins (3) in high yields except for 3-methoxysalicylaldehyde (1b). It was clarified that methoxy group(s) at C ₄ and C ₆ on 1 facilitated the ...