Convenient Asymmetric Synthesis of β-Trifluoromethyl-β-amino Acid, β-Amino Ketones, and γ-Amino Alcohols via Reformatsky and Mannich-Type Reactions from 2-Trifluoromethyl-1,3-oxazolidines
作者:Florent Huguenot、Thierry Brigaud
DOI:10.1021/jo052323p
日期:2006.3.1
hemiacetal and (R)-phenylglycinol are reported. The Mannich-type reaction involving a chiral fluorinated iminium ion occurred in a good yield and with a higher stereoselectivity (dr up to 96:4) than that of the Reformatsky-type reaction. This straightforward strategy was applied to the short syntheses of (R)-3-amino-4,4,4-trifluorobutanoic acid, a series of novel enantiopure unprotected fluorinated
报道了由衍生自三氟乙醛半缩醛和(R)-苯基甘醇的恶唑烷起始的β-三氟甲基-β-氨基酯,β内酰胺和β-氨基酮的立体选择性合成。与Reformatsky型反应相比,涉及手性氟化亚胺离子的曼尼希型反应收率高,立体选择性更高(dr高达96:4)。这种简单的策略适用于(R)-3-氨基-4,4,4-三氟丁酸,一系列新的对映纯未保护的氟化β-氨基酮及其相应的γ-氨基醇的短合成。