Asymmetric Synthesis of Amines by the Knochel-Type MgCl<sub>2</sub>-Enhanced Addition of Benzyl Zinc Reagents to <i>N</i>-<i>tert</i>-Butanesulfinyl Aldimines
作者:Andrew W. Buesking、Tyler D. Baguley、Jonathan A. Ellman
DOI:10.1021/ol103002t
日期:2011.3.4
The MgCl2-enhanced addition of benzyl zinc reagents to N-tert-butanesulfinyl imines proceeds readily at room temperature to afford the N-tert-butanesulfinyl-protected amine products in good yields and diastereomeric ratios. This method is functional group tolerant in both the imine substrate and benzyl zinc coupling partner. Moreover, benzyl zinc reagentaddition to the N-tert-butanesulfinyl imine
The Reformatskyreaction of ethyl bromodifluoroacetate to α-oxygenated sulfinylimines is described. Using Honda–Reformatsky conditions, the reaction proceeds with double diastereodifferentiation, with the configuration of the sulfinyl group determining the stereochemical course of the reaction. Excellent diastereoselectivities (>94:6) are obtained for the matched cases. In contrast, reaction with sulfinylimines