Diastereoselective Synthesis ofβ-Amino-α-(trifluoromethyl) Alcohols from Homochiralα-Dibenzylamino Aldehydes
作者:José M. Andrés、Rafael Pedrosa、Alfonso Pérez-Encabo
DOI:10.1002/ejoc.200300659
日期:2004.4
α-amino acids, react with trimethyl(trifluoromethyl)silane in THF at 0 °C to afford, in good yields and dr, β-amino-α-(trifluoromethyl) alcohols; anti diastereomers were formed as major products in the trifluoromethylation reaction whereas syn diastereomers were obtained as single isomers in a two-step procedure. Swern oxidation of the mixtures formed in the trifluoromethylation leads to the corresponding
由相应的 α-氨基酸制备的同手性 α-二苄基氨基醛与三甲基(三氟甲基)硅烷在 0°C 的 THF 中反应,以良好的产率和 dr 得到 β-氨基-α-(三氟甲基)醇;反非对映异构体作为三氟甲基化反应的主要产物形成,而顺式非对映异构体在两步程序中作为单一异构体获得。在三氟甲基化中形成的混合物的 Swern 氧化产生相应的 α-二苄基氨基三氟甲基酮,其用硼氢化钠进行非对映选择性还原。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)