双官能N,N- '二氧化物催化剂已经被开发用于α的高度对映选择性的硅氰化反应,α二烷氧基酮。此过程中,通过催化的原位制备的脯氨酸衍生Ñ,Ñ '二氧化物2b中,所产生的相应的氰醇三甲基甲硅烷基醚以优良产率(高达99%)的高对映选择性(高达93%ee)的。根据线性效应,1 H NMR谱图,分离的氰醇以及催化剂的NH和N-氧化物部分的作用,提出了合理的机理。
双官能N,N- '二氧化物催化剂已经被开发用于α的高度对映选择性的硅氰化反应,α二烷氧基酮。此过程中,通过催化的原位制备的脯氨酸衍生Ñ,Ñ '二氧化物2b中,所产生的相应的氰醇三甲基甲硅烷基醚以优良产率(高达99%)的高对映选择性(高达93%ee)的。根据线性效应,1 H NMR谱图,分离的氰醇以及催化剂的NH和N-氧化物部分的作用,提出了合理的机理。
An organophosphine‐catalyzed enantioselective cyanosilylation of carbonyl compounds has been disclosed for the first time. This process, the dual‐reagent catalysis serves as a powerful tool, affording the desired cyanohydrin trimethylsilyl ethers in excellent yields (up to 99 %) and good‐to‐excellent enantioselectivities (up to 94 % ee).
Asymmetric Direct Aldol Reaction of Functionalized Ketones Catalyzed by Amine Organocatalysts Based on Bispidine
作者:Jie Liu、Zhigang Yang、Zhen Wang、Fei Wang、Xiaohong Chen、Xiaohua Liu、Xiaoming Feng、Zhishan Su、Changwei Hu
DOI:10.1021/ja800839w
日期:2008.4.1
Organocatalysts containing primary-secondary aminebased on bispidine and amino acid have been designed to catalyze the asymmetric direct aldol reaction of functionalized ketones including alpha-keto phosphonates, alpha-keto esters, as well as alpha,alpha-dialkoxy ketones as aldol reaction acceptors. The corresponding products with chiral tertiary alcohols were obtained in moderate to high yields (up