One-pot asymmetric synthesis of tert-butanesulfinyl-protected amines from ketones by the in situ reduction of tert-butanesulfinyl ketimines
作者:George Borg、Derek A. Cogan、Jonathan A. Ellman
DOI:10.1016/s0040-4039(99)01351-9
日期:1999.9
A one-pot method for the asymmetricsynthesis of tert-butanesulfinyl-protected amines is described. The ketones bd2 are condensed with (R)-tert-butanesulfinamide bd1 and the tert-butanesulfinyl imine intermediates reduced in situ with NaBH4 to afford the sulfinamides bd4 in 66–86% yield and with drs from 90:10 to 97:3 for both aryl alkyl and dialkylketones. Ti(OEt)4 serves as both a water scavenger
Asymmetric synthesis of chiral amines by highly diastereoselective 1,2-additions of organometallic reagents to N-tert-butanesulfinyl imines
作者:Derek A. Cogan、Guangcheng Liu、Jonathan Ellman
DOI:10.1016/s0040-4020(99)00451-2
日期:1999.7
High yielding and highly diastereoselective methods for 1,2-additions of organometallic reagents to N-tert-butanesulfinyl aldimines (2) and N-tert-butanesulfinyl ketimines (3) are described. The additions of alkyl, aryl, alkenyl, and allyl carbanions to a diverse set of imines with different steric and electronic properties are demonstrated. Acidic methanolysis of the sulfinamide products (4 and 6)