Methyl 3-aryl-3-hydroxy-2-methylene propionates react with phenols, 2-naphtol, 1,4-dihydroxybenzene, 2,3-dihydroxynaphtalene and 2,7-dihydroxynaphtalene in the presence of silica gel-supported ZnBr2 or FeCl3 to give 3-arylidene-3,4-dihydro coumarins or 3-methylene-3,4-dihydrocoumarins.
The reaction of coumarin-3-carboxylic acid with benzylic C(sp3)-H bond was established in this paper. A series of 3-benzylcoumarin derivatives were efficiently isolated in moderated to high yield using Cu(OAc)2 as catalyst and TBPB as oxidant.
Foucaud Andre, Brine Nourdine, Synth. Commun, 24 (1994) N 20, S 2851-2861
作者:Foucaud Andre, Brine Nourdine
DOI:——
日期:——
Synthesis of 3-Arylidene-3,4-Dihydrocoumarins
作者:André Foucaud、Nourdine Brine
DOI:10.1080/00397919408010605
日期:1994.11
Methyl 3-aryl-3-hydroxy-2-methylene propionates react with phenols, 2-naphtol, 1,4-dihydroxybenzene, 2,3-dihydroxynaphtalene and 2,7-dihydroxynaphtalene in the presence of silica gel-supported ZnBr2 or FeCl3 to give 3-arylidene-3,4-dihydro coumarins or 3-methylene-3,4-dihydrocoumarins.