Incorporation of deuterium-labelled analogs of isopentenyl diphosphate for the elucidation of the stereochemistry of rubber biosynthesis
作者:Andrew A. Scholte、John C. Vederas
DOI:10.1039/b515750a
日期:——
prepared to investigate the detailed stereochemical course of addition of C5 units during rubber biosynthesis in Hevea brasiliensis and Parthenium argentatum. These analogs were incorporated into the cis-polyisoprene chain by rubber transferase in rubber particles, and the stereochemistry was determined by 2H-NMR analysis of the polymer or of levulinic acid derivatives obtained from its ozonolytic degradation
制备了一系列六个氘标记的异戊基二磷酸酯(IPP)的类似物,以研究巴西橡胶树和阿根廷银橡胶中橡胶生物合成过程中添加C5单元的详细立体化学过程。这些类似物通过橡胶颗粒中的橡胶转移酶掺入顺式聚异戊二烯链中,并通过2H-NMR分析该聚合物或由其臭氧分解得到的乙酰丙酸衍生物,确定立体化学。结果表明橡胶链伸长发生在IPP的pro-S氢丢失,向IPP的表面添加烯丙基二磷酸酯以及在带有二磷酸酯的碳上的立体化学反转。