Preparation of Optically Active (2RS,3SR)-2-Amino-3-hydroxy-3-phenylpropanoic Acid (threo-.BETA.-Phenylserine) via Optical Resolutions by Replacing and Preferential Crystallization
作者:Tadashi Shiraiwa、Yuka Kawashima、Atsushi Ikaritani、Yumiko Suganuma、Reiichi Saijoh
DOI:10.1248/cpb.54.1170
日期:——
the melting point. When, in optical resolution by replacing crystallization, L-phenylalanine methyl ester hydrochloride (L-2) was used as the optically active co-solute, (2R,3S)-1.HCl was preferentially crystallized from the supersaturated racemic solution; the use of D-2 as the co-solute afforded (2S,3R)-1.HCl with an optical purity of 95%. In addition, optical resolution by preferential crystallization
通过取代和优先结晶,通过光学拆分获得旋光的苏--2-氨基-3-羟基-3-苯基丙酸(1),(2RS,3SR)-1盐酸盐[(2RS,3SR)-1的外消旋结构根据熔点,溶解度和红外光谱检查[HCl]。尽管在熔点下形成(2RS,3SR)-1.HCl,但仍以团块形式存在,尽管它在熔点形成外消旋化合物。在通过代替结晶的光学拆分中,使用L-苯丙氨酸甲酯盐酸盐(L-2)作为旋光活性共溶质时,优先从过饱和的外消旋溶液中结晶出(2R,3S)-1.HCl;使用D-2作为共溶质,提供了(2S,3R)-1.HCl,其光学纯度为95%。此外,通过优先结晶成功实现了光学拆分,从而连续获得光学纯度为90-92%的(2R,3S)-和(2S,3R)-1.HCl。从1-丙醇中重结晶纯化的(2R,3S)-和(2S,3R)-1.HCl用甲醇中的三乙胺处理,得到光学纯的(2R,3S)-和(2S,3R)-1。