Heterocycles p. 613 - 622 (1994)
Update date:2022-08-24
Topics:
Harayama, Takashi
Katsuno, Keiko
Nishioka, Hiromi
Fujii, Masako
Nishita, Yoshitaka
et al.
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 C4 and C6 on 1 facilitated the formation of 3.
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