Regioselectivity and Deuterium Isotope Effects in Geraniol Hydroxylation by the Cytochrome P-450 Monooxygenase fromCatharanthus roseus (L.) G. DON
作者:Heinz Fretz、Wolf-Dietrich Woggon
DOI:10.1002/hlca.19860690822
日期:1986.12.10
The hydroxylation of geraniol (8) by cytochrome P-450 (P-450Cath.) from the subtropical plant Catharanthus roseus (L.) G. DON was optimised to give 8-hydroxygeraniol (9) as the single product in 35% yield. Incubations of different 13C- and 2H-labelled geraniols revealed that H-abstraction is completely regioselective in favour of the CH3 group trans to the chain at C(6) of 8. An intramolecular isotope
亚热带植物长春花(L.)G. DON的细胞色素P-450(P-450蛋白酶)对香叶醇(8)的羟基化反应进行了优化,以35%的收率得到了8-羟基香叶醇(9)作为单一产品。 。不同的温育13 C-和2 H-标记geraniols表明H-抽象是有利于CH完全区域选择性3组反式到链上的C(6)8。分子内同位素效应k H / k D= 8.0被确定,表明H提取是主要的速率贡献步骤之一;然而,在低转换k H / k D = 0.50时,分子间同位素效应却出乎意料地相反,表明该序列中第一个不可逆的,对同位素敏感的反应之前存在速率分布步骤。