申请人:Lentzen George
公开号:US20110178292A1
公开(公告)日:2011-07-21
The invention relates to an innovative method for synthesis of cyclic amidines. The synthesis starts from a β-, γ- or δ-lactone which is twofold brominated. After esterification of the carboxyl function, the bromine atoms are nucleophilically substituted and the corresponding diamino compound is obtained. The ring closure to the cyclic amidine is accomplished subsequently by reaction with orthoester, imidate or thioimidate. Owing to interposing additional steps for recovery of the diamino compound in enantiomerically pure form, the enantiomers of the cyclic amidines can be stereoselectively synthesized.
该发明涉及一种合成环氨基甲酸盐的创新方法。合成从β-、γ-或δ-内酯开始,该内酯经过双溴化。在羧基酯化后,溴原子被亲核取代,得到相应的二氨基化合物。随后通过与正酯、亚胺酯或硫代亚胺的反应实现环氨基甲酸盐的环闭合。由于插入额外步骤以以对映纯形式回收二氨基化合物,因此可以立体选择性地合成环氨基甲酸盐的对映体。