Kulkarni; Joshi, Journal of the Indian Chemical Society, 1957, vol. 34, p. 217,224
作者:Kulkarni、Joshi
DOI:——
日期:——
Regio- and stereoselective oxidation of flavan-3-ol- 4-arylflavan-3-ol- and biflavanoid derivatives with 2,3-dichloro-56-dicyano-1,4-benzoquinone (DDQ)
作者:Jacobus A. Steenkamp、C.Hendrik L. Mouton、Daneel Ferreira
DOI:10.1016/s0040-4020(01)82322-x
日期:1991.8
The phenolic methyl ethers of flavan-3-ols, 4-beta-arylflavan-3-ols, and (-)-fisetinidol-(4-beta,8)-(+)-catechin biflavanoids are susceptible to regio- and stereoselective methoxylation at C-4 in moderate yields with DDQ in CHCl3-MeOH solution. The observed asymmetric induction with exclusive formation of 2,4-trans products is compatible with the intermediacy of a diastereogenic donor-acceptor interaction, DDQ acting as the acceptor and oxidant. The 4-funtionalized analogues are of both synthetic and degradative significance in condensed tannin chemistry.
Oyamada, Justus Liebigs Annalen der Chemie, 1939, vol. 538, p. 44,52