S<sub>N</sub>2′ Reaction of Organozinc Reagents Activated by Catalytic<i>t</i>Bu-P4 Base in the Presence of LiCl
作者:Koji Kobayashi、Masahiro Ueno、Hiroshi Naka、Yoshinori Kondo
DOI:10.1002/chem.200900556
日期:2009.9.28
The tBu‐P4 base was found to be an excellent catalyst for the activation of organozinc reagents. The base was used to promote the SN2′ reaction of α,β‐unsaturated esters bearing a γ‐chloride in the reactions with various organozinc reagents in the presence of LiCl. The reactions proceeded in high yield with excellent chemo‐and regioselectivity. The role of LiCl appears to be the activation of the γ‐chloride
所述吨卜-P4基被认为是对有机锌试剂的激活的良好催化剂。该碱用于在LiCl存在下与各种有机锌试剂反应中促进带有γ氯化物的α,β-不饱和酯的S N 2'反应。反应以高收率进行,具有出色的化学和区域选择性。LiCl的作用似乎是α,β-不饱和酯的γ-氯化物的活化,这已通过NMR光谱学研究证实。