Enantioselective Allylation of <i>β</i><i>,</i><i>γ</i>-Unsaturated Aldehydes Generated via Lewis Acid Induced Rearrangement of 2-Vinyloxiranes
作者:Mark Lautens、Matthew L. Maddess、Effiette L. O. Sauer、Stéphane G. Ouellet
DOI:10.1021/ol016946a
日期:2002.1.1
[reaction: see text] 2-Vinyloxiranes have been found to be excellent surrogates to beta,gamma-unsaturated aldehydes. These valuable electrophiles, generated in situ by treatment of a 2-vinyloxirane with a catalytic amount of Sc(OTf)(3), are effectively trapped by the chiral allylating agents based on alpha-pinene, affording bishomoallylic alcohols in high yield and excellent selectivity.
[反应:见正文]已发现2-乙烯基氧杂环戊烷是β,γ-不饱和醛的优良替代物。这些有价值的亲电试剂是通过催化量的Sc(OTf)(3)处理2-乙烯基环氧乙烷而原位生成的,它们被基于α-pine烯的手性烯丙基化剂有效地捕获,从而以高收率和优异的选择性提供了双烯丙基烯丙醇。 。