Stereospecific conversion of (1R*,3S*)- and (1R*,3R*)-3-cyclohexyl-1-phenylpropane-1,3-diol into the corresponding 2,4-disubstituted oxetanes
作者:Tajassus Aftab、Christabel Carter、Martin Christlieb、Jennifer Hart、Adam Nelson
DOI:10.1039/a909163g
日期:——
Conversion of two diastereoisomeric 1,3-diols (3-cyclohexyl-1-phenylpropane-1,3-diol) into orthoesters was followed by treatment with acetyl bromide. The 1,3-bromo acetates (acetic acid 3-bromo-1-cyclohexyl-3-phenylpropyl esters) were obtained with complete inversion of configuration at a benzylic site. Methanolysis of the bromo acetates, followed by ring-closure, resulted in a second inversion of configuration at a benzylic site to give the corresponding oxetanes with overall retention of configuration.
将两个非对映异构体1,3-二醇(3-环己基-1-苯基丙烯-1,3-二醇)转化为邻醇酯,随后用溴乙酸酯处理。在苯基取代位点实现了完全的构型反转,得到了1,3-溴乙酸酯(乙酸3-溴-1-环己基-3-苯基丙基酯)。对溴乙酸酯进行甲醇解后,再进行环闭合,导致在苯基取代位点发生第二次构型反转,最终得到相应的氧环丁烷,并整体保留了构型。