Regio- and Stereoselectivity of the Intramolecular C–H Insertion by Cyclopropylidenes Bearing a Remote Oxido Substituent
作者:Toshiro Harada、Yasunari Yamaura、Akira Oku
DOI:10.1246/bcsj.60.1715
日期:1987.5
(ω-Oxidoalkyl)cyclopropylidenes generated from (2,2-dibromo-1-methylcyclopropyl)-CH2–X–(CH2)n–OH (X=CH2 or O, n=1, 2) by the reaction with methyllithium underwent a regioselective intramolecular insertion into the C–H bond at the δ position to the carbenic carbon. The activation effect of the oxido substituent on the reactivity of C–H bonds is discussed on the basis of (1) the ratio of the insertion products
由 (2,2-二溴-1-甲基环丙基)-CH2-X-(CH2)n-OH (X=CH2 或 O, n=1, 2) 与甲基锂反应生成的 (ω-氧化烷基) 环亚丙基区域选择性分子内插入碳碳的 δ 位置的 C-H 键。基于(1)插入产物与重排产物丙二烯醇的比率,和(2)本插入反应的内立体选择性,讨论了氧化取代基对 C-H 键反应性的活化作用。