The Exceptional Chelating Ability of Dimethylaluminum Chloride and Methylaluminum Dichloride. The Merged Stereochemical Impact of α- and β-Stereocenters in Chelate-Controlled Carbonyl Addition Reactions with Enolsilane and Hydride Nucleophiles
作者:David A. Evans、Brett D. Allison、Michael G. Yang、Craig E. Masse
DOI:10.1021/ja011337j
日期:2001.11.1
beta-disubstituted aldehydes concludes that the syn aldehyde diastereomer possesses the arrangement of stereocenters wherein the alpha- and beta-substituents impart a reinforcing facial bias upon the aldehyde carbonyl. Aldol reactions of syn aldehydes were thus observed to proceed with uniformly excellent diastereofacial selectivity. Aldol reactions of the corresponding anti aldehydes containing opposing
A process for formation of a compound of formula (I) or a pharmaceutically acceptable salt thereof, (A chemical formula should be inserted here—please see paper copy enclosed herewith) I via a Heck reaction is described. Intermediates useful in the process and processes for making said intermediates are also described.