Diastereoselective reduction and carboncarbon bond formation of α-keto esters/amides with SmI2
摘要:
The stereoselective reduction of alpha -keto esters/alpha -keto amides, which have various chiral auxiliaries using SmI2, is examined. 2(S)-Methoxymethylpyrrolidine, 1,1,2(S)- and 1,1,2(R)-triphenylethanediol were found to be suitable chiral auxiliaries that produced the corresponding alpha -hydroxy ester and amide in good diastereoselectivity with satisfactory yields. Allylation, the Reformatsky-type reaction, and the ketyl-alkene coupling reaction with the 1,1,2(R)-triphenylethanediol and 2(S)-methoxymethylpyrrolidine, derivative of the alpha -keto ester/amide proceeded smoothly with high diastereoselectivity. (C) 2001 Elsevier Science Ltd. All rights reserved.
Highly Diastereoselective Reduction of New Chiral α-Ketoamides
作者:Il Suk Byun、Yong Hae Kim
DOI:10.1080/00397919508015873
日期:1995.7
Both pyruvamide and benzoylformamide having (S)-2-methoxymethylindoline as a chiral auxiliary were reduced with various reducing agents in high stereoselectivities (up to dr = 99 : 1).