中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 3-[(2S)-1-(tert-butoxycarbonyl)pyrrolidinyl]propanoic acid | 65595-02-0 | C12H21NO4 | 243.303 |
Boc-L-脯氨酸甲酯 | (S)-N-(tert-butoxycarbonyl)proline methyl ester | 59936-29-7 | C11H19NO4 | 229.276 |
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.