139386-29-1Relevant articles and documents
A Convenient Synthesis of a Simple Coumarin from Salicylaldehyde and Wittig Reagent (I): A Synthesis of Methoxy- and Hydroxycoumarins
Harayama, Takashi,Katsuno, Keiko,Nishioka, Hiromi,Fujii, Masako,Nishita, Yoshitaka,et al.
, p. 613 - 622 (2007/10/02)
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.