Stereoselective Synthesis of 1-Aminocyclopropanecarboxylic Acid Carnosadines via Inter-intramolecular Double Alkylation with Optically Active 2-Methylaziridine Derivatives
作者:Kosuke Ohsawa、Junya Kubota、Shota Ochiai、Takayuki Doi
DOI:10.1021/acs.joc.1c00680
日期:2021.5.21
The stereoselective and short-step synthesis of N-protected allo-carnosadine, ent-carnosadine, and carnosadine lactam was accomplished from a common cyclopropane intermediate. The inter-intramolecular double alkylation of diethyl malonate with an optically active 2-methylaziridine derivative gave the key cyclopropane in excellent yield and optical purity. The following monohydrolysis of the diester
的立体选择性和短步骤合成ñ -保护的同种异体-carnosadine,耳鼻喉科-carnosadine和carnosadine内酰胺是从一个共同的环丙烷中间体来完成。丙二酸二乙酯与旋光的2-甲基氮丙啶衍生物的分子间双烷基化以优异的收率和光学纯度提供了关键的环丙烷。随后在不同反应条件下对二酯部分进行单水解,得到了两种单酸的非对映异构体,它们从普通二酯以5–6步转化为三种香豆素衍生物。