Chemical and Pharmaceutical Bulletin p. 2170 - 2173 (1994)
Update date:2022-08-15
Topics:
Harayama
Nakatsuka
Nishioka
Murakami
Hayashida
Ishii
Reaction of salicylaldehydes (1) with carbethoxymethylenetriphenylphosphorane in diethylaniline under reflux gave coumarins (3) in moderate to high yield except 3-methoxycarbonylsalicylaldehyde (1e). The substituent effects are discussed. A substituent at C6 on 1 usually facilitated the formation of the coumarin ring regardless of its electronic character.
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Doi:10.1021/jo991984h
(2000)Doi:10.1039/j29700000535
(1970)Doi:10.1016/S0040-4039(01)88450-1
(1969)Doi:10.1007/BF02673875
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(1970)
