Trifluoroacetic acid (TFA) was found to promote intramolecular formal N-H insertion reactions. Upon treatment with TFA, optically pure N-Boc-β'-amino-α-diazoketones (5a-c) and N-Boc-γ'-amino-α-diazoketones (10a-d) can be converted, with retention of chirality, into pyrrolidinones (11a-c) and piperidinones (12a-d), respectively, with concomitant removal of the Boc group, in good to excellent yields.Key words: α-diazoketone, amino acid, pyrrolidinone, piperidinone, N-H insertion.
三氟乙酸(TFA)被发现促进分子内正式N-H插入反应。经TFA处理后,光学纯的N-Boc-β'-氨基-α-重氮酮(5a-c)和N-Boc-γ'-氨基-α-重氮酮(10a-d)可以保持手性转化为吡咯烷酮(11a-c)和哌啶酮(12a-d),同时去除Boc基团,产率良好至优良。关键词:α-重氮酮,氨基酸,吡咯烷酮,哌啶酮,N-H插入。