Synthesis of modified proanthocyanidins: easy and general introduction of a hydroxy group at C-6 of catechin; efficient synthesis of elephantorrhizol
作者:François-Didier Boyer、Nour-Eddine Es-Safi、Josiane Beauhaire、Christine Le Guernevé、Paul-Henri Ducrot
DOI:10.1016/j.bmcl.2004.11.061
日期:2005.2
A general procedure for the oxidation of catechin derivatives is described, leading to the introduction of a new hydroxy group at C-6. This procedure has been applied for the synthesis of elephantorrhizol, a natural flavan-3-ol exhibiting a fully substituted cycle A.
Hydroxylation of Ring A of Flavan-3-ols: Influence of the Ring A Substitution Pattern on the Oxidative Rearrangement of 6-Hydroxyflavan-3-ols
作者:Paul-Henri Ducrot、François-Didier Boyer、Josiane Beauhaire、Marie Martin
DOI:10.1055/s-2006-950224
日期:——
procedure for the oxidation of catechin derivatives is described, leading to the introduction of a new hydroxyl group at C-6. This procedure has been used for the synthesis of a number of 6-hydroxy flavan-3-ols, including elephantorrhizol, a natural flavan-3-ol exhibiting a fully substituted A ring. The substitution at C-8, albeit of poor influence on the course of this oxidation reaction, has been
描述了儿茶素衍生物氧化的一般程序,导致在 C-6 处引入新的羟基。该程序已用于合成许多 6-羟基黄烷-3-醇,包括大象根,一种具有完全取代的 A 环的天然黄烷-3-醇。C-8 位点的取代虽然对该氧化反应的过程影响不大,但已被证明对于 6-羟基-黄烷-3-醇的进一步自发氧化和重排成对苯醌具有优势。整个过程允许制备源自儿茶素的 6-烷基取代的苯醌。