Asymmetric synthesis. Part VI. Reactions of 3,3,5-trimethylcyclohexanone with Grignard reagents and configurational interrelationships of 1-alkyl(alkenyl and alkynyl)-3,3,5-trimethylcyclohexanols and compounds derived from 1-hydroxy-3,3,5-trimethylcyclohexanecarbonitriles
作者:S. R. Landor、P. W. O'Connor、A. R. Tatchell、I. Blair
DOI:10.1039/p19730000473
日期:——
The reactions of 3,3,5-trimethylcyclohexanone (I) with methyl-, ethyl-, vinyl-, allyl-, prop-2-ynyl-, isopropyl-, and t-butyl-magnesium halides and with methyl-, ethyl-, isopropyl-, and t-butyl-lithium gave one product in each case. Chemical correlations and n.m.r. data showed that all had the same relative configuration (trans-1 -OH,5-Me). The epimeric cyanohydrins from 3,3,5-trimethylcyclohexanone
3,3,5-三甲基环己酮(I)与甲基,乙基,乙烯基,烯丙基,丙-2-炔基,异丙基和叔丁基镁卤化物的反应,以及与甲基,乙基-每种情况下,异丙基锂,异丙基锂和叔丁基锂得到一种产物。化学相关性和nmr数据表明,它们都具有相同的相对构型(反式-1 -OH,5-Me)。来自3,3,5-三甲基环己酮的差向异构体氰醇提供了生成差向异构体1-羟基-3,3,5-三甲基环己烷甲酸甲酯的途径;报道了与1-烷基类似物的构型相互关系。与先前的报告相反,酮(I)与二甲基氧代砜亚甲基化物和二甲基亚砜基亚甲基的反应产生相同的环氧乙烷,还原后得到反式-化合物。1,1,3-三甲基-5-亚甲基环己烷的环氧化反应和生成的环氧乙烷的还原得到难以捉摸的1,3,3-顺式-5-四甲基环己醇,该结构由环氧乙烷前体的NMR数据证实。