Asymmetric Aza-Mannich Reactions of Sulfinimines: Scope and Application to the Total Synthesis of a Bromopyrrole Alkaloid
作者:James C. Lanter、Hongfeng Chen、Xuqing Zhang、Zhihua Sui
DOI:10.1021/ol0525258
日期:2005.12.1
[reaction: see text] An asymmetric intermolecular aza variant of the Mannich reaction is reported utilizing chiral sulfinimine anions as the nucleophile and N-sulfonyl aldimines as the electrophilic component. A wide range of nucleophiles and electrophiles are tolerated by the reaction conditions, delivering the condensation products in good to excellent yield with a high degree of stereocontrol. Application
the highly diastereoselective synthesis of chiral homoallylic amines by Zn-mediated allylation of chiral N-tert-butanesulfinyl imines at room temperature was developed. By simply tuning the reaction conditions, the method allows the achievement of a highly remarkable opposite stereocontrol, affording the desired stereochemical outcome in good yield and with excellent diastereoselectivity (up to 98%
Efficient Synthesis of α-Quaternary α-Hydroxy-β-amino Esters via Silyl Glyoxylate-Mediated Three-Component Reactions
作者:Jiu-Long Jiang、Ming Yao、Chong-Dao Lu
DOI:10.1021/ol403388w
日期:2014.1.3
An efficient method has been developed for the enantioselective synthesis of fully protected alpha-quaternary alpha-hydroxy-beta-amino esters via the coupling of three components: aryl Grignard reagents (or methyllithium), silyl glyoxylate, and N-tert-butanesulfinyl imines. This protocol enables successive formation of two C-C bonds and two adjacent chiral carbons with high stereocontrol in a one-pot operation.