4,5-Didehydro-9-demethyl-9-halo-5,6-dihydroretinals and Their 9-Cyclopropyl and 9-Isopropyl Derivatives− Simple Preparation ofα-Ionone Derivatives and Pure (all-E)-, (9Z)- and (11Z)-α-Retinals
作者:Yajie Wang、Johan Lugtenburg
DOI:10.1002/ejoc.200400201
日期:2004.8
mixture of (9Z) and (all-E) isomers by 1,4-nucleophilic addition reactions. The pure (all-E) and (9Z) isomers could be separated by simple column chromatography. The corresponding [(9Z)- and (all-E)-9-demethyl-9-fluoro-α-ionylidene]acetaldehydes could also be obtained in pure form by simple column chromatography. These α-ionylidene systems could be easily converted either into the (all-E)-4,5-dideh
α-紫罗兰酮及其几种化学改性衍生物已通过 Wadsworth-Emmons 程序使用亚氨基膦酸盐阴离子试剂以高产率和完全异构纯度制备。以 α-紫罗兰酮为原料,可制备 5-(2',6',6'-trimethylcyclo-2'-hexen-1'-yl)-4-penten-2-yn-1-al - 锅程序。相应的(9-Cl-、9-Br-和9-I-α-亚亚乙基)乙醛体系可以在(9Z)和(全-E)异构体的定量混合物中通过1,4-亲核反应一步获得。加成反应。纯(全 E)和(9Z)异构体可以通过简单的柱色谱分离。相应的 [(9Z)- 和 (all-E)-9-demethyl-9-fluoro-α-ionylidene] 乙醛也可以通过简单的柱色谱以纯形式获得。这些 α-亚离子系统可以很容易地转化为 (all-E)-4,5-didehydro-9-demethyl-9-halo-5,6-dihydroretinals