The present invention provides a simple, practical, and industrially advantageous process for producing an optically active α-substituted cysteine or a salt thereof from inexpensive and readily available materials. The present invention provides a process for producing an optically active α-substituted cysteine or a salt thereof by converting a cysteine derivative into a thiazoline compound and subjecting the resulting thiazoline compound to a stereoselective substituent-introducing reaction catalyzed by an optically active quaternary ammonium salt, in particular, an axially asymmetric quaternary ammonium salt to produce an optically active thiazoline compound and then hydrolyzing the resulting thiazoline compound.
本发明提供一种简单、实用且具有工业优势的工艺,从廉价且易得的材料中生产出光学活性的α-取代半胱
氨酸或其盐。本发明提供了一种生产光学活性α-取代半胱
氨酸或其盐的工艺,通过将半胱
氨酸衍
生物转化为
噻唑环化合物,并将所得的
噻唑环化合物在光学活性季
铵盐的催化下进行立体选择性取代基引入反应,特别是在轴向不对称季
铵盐的催化下,产生光学活性
噻唑环化合物,然后
水解所得的
噻唑环化合物。