Chemical and Pharmaceutical Bulletin p. 3100 - 3102 (1991)
Update date:2022-07-29
Topics:
Ishii
Kaneko
Miyazaki
Harayama
Reaction of salicylaldehydes (1) with carbethoxymethylenephosphorane in diethylaniline under reflux gave coumarins (3) in excellent yields. Methoxy substituent at C'4 on salicylaldehyde (1) facilitated the formation of coumarin from trans-cinnamate (2), which is first prepared by reaction of 1 with Wittig reagent.
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