作者:Jens Christoffers、Thomas Werner、Wolfgang Frey、Angelika Baro
DOI:10.1002/chem.200305486
日期:2004.2.20
route to enantiomerically pure (-)-kjellmanianone is reported. The synthesis involves a cerium-catalyzed alpha-hydroxylation and an enzyme-catalyzed procedure to resolve tertiary alcohols at key stages. The intermediate beta-oxo ester was alpha-hydroxylated to give good yields of racemic kjellmanianone. The resolution of the racemic material was achieved by enzymatic saponification, followed by a chemical
报道了对映体纯的(-)-kjellmanianoneone的直接途径。该合成涉及铈催化的α-羟基化和酶催化的步骤,以解决关键阶段的叔醇。中间体β-氧代酯被α-羟基化以得到良好的外消旋凯尔曼尼酮收率。外消旋物质的拆分是通过酶促皂化作用,然后通过化学脱羧顺序完成的,得到对映体纯的(-)-kjellmanianoneone,其ee值为99%。然后溴化得到(-)-溴衍生物,其X射线结构为(-)-kjellmanianone的R构型提供了证据。