Asymmetric Intramolecular Michael Addition of α-Sulfinyl Vinylic Carbanion to Enoates
作者:Naoyoshi Maezaki、Hiroaki Sawamoto、Sachiko Yuyama、Ryoko Yoshigami、Tomoko Suzuki、Mayuko Izumi、Hirofumi Ohishi、Tetsuaki Tanaka
DOI:10.1021/jo0492923
日期:2004.9.1
The first example of an asymmetric intramolecular Michael addition reaction with use of α-lithiated vinylic sulfoxide as a Michael donor is reported. Michael addition of the α-lithiated vinylic sulfoxide to (Z)-enoates proceeds with high diastereoselectivity to give the adducts with (R)-configuration at the β-position of the ester in the five-membered-ring formation. The selectivity was reversed in
报道了使用α-锂化的乙烯基亚砜作为迈克尔供体的不对称分子内迈克尔加成反应的第一个例子。将α-锂化的乙烯基亚砜迈克尔加成到(Z)-烯酸酯上,具有高的非对映选择性,从而在五元环形成中在酯的β-位得到具有(R)-构型的加合物。在六元环形成中,选择性相反。使所得的酯烯醇化物与烷基卤化物或苯甲醛以高非对映选择性反应。