Chemistry Letters p. 1325 - 1328 (1982)
Update date:2022-09-26
Topics:
Hasegawa, Masaki
Katsuki, Hirokazu
Yonezawa, Noriyuki
Yoshida, Tsuyoshi
Ikebe, Yutaka
The lacton-opening reaction of syn head-to-head coumarin dimer with amines gave c-3,c-4-bis(2-hydroxyphenyl)-r-1,c-2-cyclobutanedicarboxamides and/or -dicarboximides.The product ratio of the amide to the imide varied with the reaction temperature and the amount of amine used.Thermal reaction of these lactone-opened derivatives proceeded in two ways depending on the nature of amine moiety to give either the original coumarin dimer or 2,2'-dihydroxystilbene and the maleimide derivative.
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