Method for producing N-carbamate-protected beta-aminoepoxide and beta-aminoalcohol
申请人:Ajinomoto Co., Inc.
公开号:EP1428818A2
公开(公告)日:2004-06-16
The invention relates to a method for industrially producing highly pure (2R, 3S)- or (2S, 3R)-N-carbamate-protected β-aminoepoxide (crystal) or (2R, 3S)- or (2S, 3R)-N-carbamate-protected β-aminoalcohol. The method for producing N-carbamate-protected β-aminoepoxide crystal, comprises the following steps (a) to (d):
(a) a step of dissolving (2R, 3S)- or (2S, 3R)-N-carbamate-protected β-aminoalcohol containing at least the diastereomer as an impurity in a solvent comprising at least one or more selected from aromatic hydrocarbon solvent, saturated hydrocarbon solvent, aqueous mixture solvent, acetone and 2-propanol, to remove insoluble matters;
(b) a step of treating the (2R, 3S)- or (2S, 3R)-N-carbamate-protected β-aminoalcohol with a base, thereby converting the N-carbamate-protected β-aminoalcohol to (2R, 3S)- or (2S, 3R)-N-carbamate-protected β-aminoepoxide;
(c) a step of treating the (2R, 3S)- or (2S, 3R)-N-carbamate-protected β-aminoepoxide containing at least the diastereomer as an impurity with an acid, thereby converting the diastereomer as an impurity to (4S, 5R) or (4R, 5S) oxazolidin-2-one derivative,
and optionally separating and removing the resulting oxazolidin-2-one derivative in water or an aqueous mixture solvent; and
(d) a step of crystallizing the (2R, 3S)- or (2S, 3R)-N-carbamate-protected β-aminoepoxide in a mixture solvent of water and water-miscible organic solvent.
本发明涉及一种工业化生产高纯度(2R, 3S)- 或(2S, 3R)-N-氨基甲酸酯保护的β-环氧乙烷(晶体)或(2R, 3S)- 或(2S, 3R)-N-氨基甲酸酯保护的β-氨基甲醇的方法。生产受 N-氨基甲酸酯保护的 β-环氧乙烷晶体的方法包括以下步骤 (a) 至 (d):
(a) 将至少含有非对映异构体作为杂质的(2R,3S)-或(2S,3R)-N-氨基甲酸酯保护的 β-氨基乙醇溶解在至少一种或多种选自芳香烃溶剂、饱和烃溶剂、水混合溶剂、丙酮和 2-丙醇的溶剂中,以除去不溶物;
(b) 用碱处理(2R,3S)-或(2S,3R)-N-氨基甲酸酯保护的 β-氨基乙醇,从而将 N-氨基甲酸酯保护的 β-氨基乙醇转化为(2R,3S)-或(2S,3R)-N-氨基甲酸酯保护的 β-氨基环氧化物;
(c) 用酸处理至少含有非对映异构体作为杂质的(2R,3S)-或(2S,3R)-N-氨基甲酸酯保护的β-氨基环氧化物,从而将非对映异构体作为杂质转化为(4S,5R)或(4R,5S)噁唑烷-2-酮衍生物、
并选择性地在水或水性混合溶剂中分离和去除所得到的噁唑烷-2-酮衍生物;以及
(d) (2R,3S)-或(2S,3R)-N-氨基甲酸酯保护的 β-氨基环氧化物在水和水混溶有机溶剂的混合溶剂中结晶的步骤。