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
由相应的 α-氨基酸制备的同手性 α-(二苄基氨基)醛与乙炔基溴化镁在 THF/Et2O 中于 0°C 反应,以良好的产率和 dr 提供炔丙基 1,2-氨基醇;反非对映异构体总是作为该反应的主要产物形成。这些化合物是合成具有 C2 对称性的内消旋和对映纯 1,6-二氨基-2,5-二醇的通用中间体。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)