Chiral synthesis via organoboranes. 20. Conversion of boronic esters of essentially 100% optical purity to B-alkyl-9-borabicyclo[3.3.1]nonanes of very high optical purity. Synthesis of optically active homologated esters, nitriles, and ketones
作者:Herbert C. Brown、Navalkishore N. Joshi、Chongsuh Pyun、Bakthan Singaram
DOI:10.1021/ja00187a030
日期:1989.3
Acyclic Stereoselective Boron Alkylation Reactions for the Asymmetric Synthesis of β-Substituted α-Amino Acid Derivatives
作者:Martin J. O'Donnell、Jeremy T. Cooper、Mary M. Mader
DOI:10.1021/ja0298794
日期:2003.3.1
Optically active syn- or anti-β-substituted-α-amino acidderivatives are prepared in 94 to ≥99% ee and 66−98% ds by reaction of the Schiff base acetate of glycine tert-butyl ester with chiral, nonracemic B-alkyl-9-BBN derivatives in the presence of the Cinchona alkaloid, cinchonidine (CdOH) or cinchonine (CnOH), base, and lithium chloride.