Novel stabilized activated derivatives of carbamic acid, their process of preparation and their use for the preparation of ureas
申请人:——
公开号:US20020143191A1
公开(公告)日:2002-10-03
Process for the preparation of stable activated derivatives of carbamic acid, comprising at least one protected amino group and an activated carbamic acid function, from an amino acid derivative in which the amino group is protected. The process includes: a) a step of transformation of the —COOH group of the amino acid derivative into a —CON
3
group to obtain an acyl azide; b) a step of transformation of the —CON
3
group of the acyl azide into a —NCO group to obtain an isocyanate; c) a step of treating the isocyanate to obtain a stable derivative of carbamic acid.
制备稳定活化的
氨基甲酸衍
生物的过程,包括至少一个受保护的
氨基团和一个活化的
氨基甲酸功能,从
氨基酸衍
生物中,其中
氨基团被保护。该过程包括:a) 将
氨基酸衍
生物的—COOH基团转化为—CON3基团以获得酰基
叠氮化合物;b) 将酰基
叠氮化合物的—CON3基团转化为—NCO基团以获得
异氰酸酯;c) 处理
异氰酸酯以获得稳定的
氨基甲酸衍
生物。