Diastereoselective syntheses of 2-amino propargyl alcohols. Chiral building blocks for enantiopure amino γ-lactones and 5-hydroxy-piperidinone derivatives
摘要:
alpha-Dibenzylamino aldehydes, derived from the corresponding natural alpha-amino acids, react with metal acetylides to yield anti-amino propargyl alcohols in good yield and diastereomeric excess. syn Amino alcohols are prepared from the. anti diastereo-isomers and all of them are elaborated in few steps to enantiopure amino lactones and hydroxy-piperidin-2-ones. (c) 2006 Elsevier Ltd. All rights reserved.
Diastereoselective Ethynylation of Chiral α-(Dibenzylamino) Aldehydes: Synthesis ofmeso- and HomochiralC2-Symmetrical 1,6-Diamino-2,5-diols
作者:José M. Andrés、Rafael Pedrosa、Alfonso Pérez-Encabo
DOI:10.1002/ejoc.200600214
日期:2006.8
Homochiral α-(dibenzylamino) aldehydes, prepared from the corresponding α-amino acids, react with ethynylmagnesium bromide in THF/Et2O at 0 °C to afford, in good yields and dr, propargylic 1,2-amino alcohols; anti diastereomers were always formed as the major products in this reaction. These compounds are versatile intermediates in the synthesis of meso- and enantiopure 1,6-diamino-2,5-diols with C2