A cross-linked polystyrene supported hindered lithium amide as a deprotonation reagent for α-methylation of lactic acid
作者:Kohtaro Watanabe、Yoshito Andou、Yoshihito Shirai、Haruo Nishida
DOI:10.1016/j.tetlet.2013.06.019
日期:2013.8
of interest as an upgraded feedstock recyclable material derived from poly(l-lactic acid). To achieve more efficient process of PTMG production from lactic acid, hindered lithium amide supported by cross-linked polystyrene as a deprotonation reagent was prepared from commercially available Merrifield resin, 2,2,6,6-tetramethyl-4-pipedinol, and n-butyllithium. A polymer-supported lithium 2,2,6,6-tetr
聚(四甲基乙交酯)[PTMG]作为衍生自聚(1-乳酸)的升级的原料可回收材料,目前引起了广泛的关注。从乳酸实现PTMG生产更有效的方法,受阻通过交联聚苯乙烯作为去质子试剂支持氨基化锂是从市售-Merrifield树脂,2,2,6,6-四甲基-4- pipedinol,和制备Ñ -丁基锂。发现聚合物负载的2,2,6,6-四甲基哌啶锂/甲基碘系统是乳酸衍生物α-甲基化反应的有效条件,在室温下可提供优异的α-甲基化产物收率(98%)温度,反应时间非常短。