Sc(OTf)3-Catalyzed Addition of Bromomagnesium 2-Vinyloxy Ethoxide to Various Aldehydes Leading to Protected Aldol Products
作者:Paul Knochel、Pauline Quinio、Laura Kohout、Daniela Roman、Jakob Gaar、Konstantin Karaghiosoff
DOI:10.1055/s-0035-1561934
日期:——
The addition of bromomagnesium 2-vinyloxy ethoxide to various aldehydes in the presence of 10 mol% Sc(OTf) 3 provides a broad range of functionalized protected aldol compounds. The enantioselective preparation of these aldols can be achieved via a Swern oxidation–CBS reduction sequence. Use of the dioxolane derived from 2-bromocyclohexanone provides the expected aldol product as the anti diastereoisomer
在 10 mol% Sc(OTf) 3 存在下,将溴镁 2-乙烯氧基乙醇盐添加到各种醛中,可提供范围广泛的功能化受保护羟醛化合物。这些羟醛的对映选择性制备可以通过 Swern 氧化-CBS 还原序列实现。使用衍生自 2-溴环己酮的二氧戊环可提供预期的羟醛产物作为抗非对映异构体 (dr > 99:1)。