The π-allyilanthanoidatecomplex (1), which was prepared in situ from tetra-allyltin, the lanthanoid trichloride, and n-butyl-lithium in tetrahydrofuran (THF), reacts smoothly with α,β-unsaturatedcarbonylcompounds (3)–(11) with a high degree of 1,2-regioselectivity to give 3-hydroxy-1, 5-dienes (12)–(20) in good to excellent yields.
Highly Regioselective Allylation of α-Enones and Epoxides with Lithium Tetraallyllanthanoid Ate Complex
作者:Shin-ichi Fukuzawa、Shizuyoshi Sakai
DOI:10.1246/bcsj.65.3308
日期:1992.12
be involved in this carbonyl allylation reaction with 1. Allylative ring opening of styrene oxide with 1 occurs at the more subsituted carbon (α-attack) in higher selectivity (α : β = 85 : 15) than with allyllithium and allylmagnesium bromide in diethyl ether. The complex 1 reacts with 3,4-epoxy-1-butene (35) in diethyl ether predominantly at the most substituted carbon of the oxirane to give 3-hydroxymethyl-1