Diastereoselective aldol condensation with 2-(β-ethoxycarbonyl)oxazolidine derived from norephedrine. A chiral masked synthon of ethyl formylacetate
摘要:
Deprotonation of chiral masked synthetic equivalents of ethyl glyoxalate, derived from norephedrine, with a novel base formed by addition of tert-BuLi to tert-butyl formate. and subsequent reaction with aromatic aldehydes yields P-hydroxy esters in good yield and moderate to excellent diastereomeric excesses. Reductive transformation of the condensation products, and elimination of the chiral appendage leads to enantiomerically pure 2-aminomethyl-1,3-propanediol derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved.
Diastereoselective aldol condensation with 2-(β-ethoxycarbonyl)oxazolidine derived from norephedrine. A chiral masked synthon of ethyl formylacetate
摘要:
Deprotonation of chiral masked synthetic equivalents of ethyl glyoxalate, derived from norephedrine, with a novel base formed by addition of tert-BuLi to tert-butyl formate. and subsequent reaction with aromatic aldehydes yields P-hydroxy esters in good yield and moderate to excellent diastereomeric excesses. Reductive transformation of the condensation products, and elimination of the chiral appendage leads to enantiomerically pure 2-aminomethyl-1,3-propanediol derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved.
Deprotonation of chiral masked synthetic equivalents of ethyl glyoxalate, derived from norephedrine, with a novel base formed by addition of tert-BuLi to tert-butyl formate. and subsequent reaction with aromatic aldehydes yields P-hydroxy esters in good yield and moderate to excellent diastereomeric excesses. Reductive transformation of the condensation products, and elimination of the chiral appendage leads to enantiomerically pure 2-aminomethyl-1,3-propanediol derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved.