New syntheses of optically active vitamin E side chain by chemicoenzymatic approach
作者:P. Gramatica、P. Manitto、D. Monti、G. Speranza
DOI:10.1016/s0040-4020(01)82109-8
日期:1986.1
tocopherol side chain, are described. Both reaction sequences start from (R)-citrohellol, obtained by baker's yeast reduction of geraniol. One strategy is based on the coupling between (R)-citronellyl bromide and a C5 optically active unit derived from chemical degradation of the common starting template; the other one uses an achiral isoprenic unit and a C10, building block containing two asymmetric carbon
描述了对映体纯的(3R,7R)-3,7,11-三甲基十二烷-1-醇(2a)的两个独立合成,即C 15生育酚侧链。两种反应序列均以(R)-瓜果醇为起始,其通过面包酵母的香叶醇还原而获得。一种策略是基于(R)-香茅醇溴化物与源自共同起始模板的化学降解的C 5光学活性单元之间的偶联。另一个使用非手性异戊二烯单元和一个C 10结构单元,该结构单元包含两个通过微生物反应生成的不对称碳原子。