Asymmetric, catalytic, vinylogous aldol reactions using pyrrole-based dienoxy silanes. Enantioselective synthesis of α,β-unsaturated γ-butyrolactam synthons
作者:Claudio Curti、Andrea Sartori、Lucia Battistini、Gloria Rassu、Franca Zanardi、Giovanni Casiraghi
DOI:10.1016/j.tetlet.2009.02.181
日期:2009.7
A practical, catalytic and enantioselective vinylogous Mukaiyama aldol reaction between 2-silyloxypyrrole donors and aromatic or heteroaromatic aldehyde acceptors is described. Using an enantiopure bisphosphoramide catalyst in conjunction with SiCl4, a variety of α,β-unsaturated-δ-hydroxylated γ-butyrolactam compounds were synthesized in high yields and with good to excellent levels of site-, diastereo-
描述了2-甲硅烷氧基吡咯供体与芳族或杂芳族醛受体之间的实际的,催化的和对映选择性的乙烯基Mukaiyama aldol反应。使用对映体纯的双磷酰胺催化剂与SiCl 4结合,可以高收率合成各种α,β-不饱和-δ-羟基化的γ-丁内酰胺化合物,并且对位,非对映体和对映体的选择性都非常好。