A process for the preparation of a compound of formula
in the form of a single stereoisomer, comprising deprotecting the amine group in an N-protected amino-hydroxy-cyclohexylsulfanyl-acetyl-mutilin of formula
wherein R is an amine protecting group in the form of a single stereoisomer,
and isolating a compound of formula I in the form of a single stereoisomer obtained from the reaction mixture; compounds obtainable by such processes, e.g. a compound of formula I in a crystalline form, or salts of a compound of formula I in crystalline form, and processes for the preparation of intermediates for the production of a compound of formula I.
Facile access to chiral β-homoglutamic acid from 3-cyclohexene-carboxylic acid
作者:Jing Xu、Xuebo Zhang、Zhongxiang Chen、Zhaofeng Sun、Guangling Bian、Ling Song
DOI:10.1080/00397911.2020.1802760
日期:2020.11.16
effective synthetic protocol for the synthesis of chiral β-homoglutamic acid was described. The strategy started from 3-cyclohexenecarboxylic acid, followed by three steps classic reaction including Curtius Rearrangement, oxidative cleavage of alkene, and debenzylation by catalytic hydrogenation. The chiral β-homoglutamic acid was prepared with a high yield and high enantiomeric excess. Graphical Abstract
Process for the preparation of a compound of formula I
in the form of a single stereoisomer in crystalline form, comprising deprotecting the amine group in a compound of formula IIa
or in a mixture of a compound of formula IIa with a compound of formula IIb
and isolating a compound of formula I from the reaction mixture; compounds and salts of compounds of formula I in crystalline form; pharmaceutical compositions comprising such salts; processes for the preparation of intermediates and intermediates in a process for the preparation of a compound of formula I.