作者:Armin de Meijere、Oleg V. Larionov、Sergei I. Kozhushkov
DOI:10.1055/s-2003-41037
日期:——
N-Chlorination of various amides, carbamates and lactams with inexpensive and stable calcium hypochlorite on moist alumina proceeds smoothly and efficiently, e.g. the technically important 1-chlorohexahydroazepin-2-one (3-Cl) and 1-chloropyrrolidin-2-one (7-Cl) were obtained in 95% and 98% yield, respectively. Excellent results were also observed for the N-chlorination of protected amino acid esters with a cyclopropane moiety to give derivatives such as methyl (tert-butoxycarbonylchloroamino)cyclopropylacetate (1-Cl), methyl (benzyloxycarbonylchloroamino)cyclopropylacetate (2-Cl), methyl 1-(tert-butoxycarbonylchloroamino)cyclopropanecarboxylate (5-Cl) and methyl trans-2-(tert-butoxycarbonylchloroamino)cyclopropanecarboxylate (6-Cl) in 99%, 96%, 90% and 97% yield, respectively.
在潮湿的氧化铝上,用廉价而稳定的次氯酸钙对各种酰胺、氨基甲酸酯和内酰胺进行 N-氯化反应,可以顺利而高效地进行,例如,技术上重要的 1-氯六氢氮杂卓-2-酮(3-Cl)和 1-氯吡咯烷-2-酮(7-Cl)的产率分别为 95% 和 98%。在对带有环丙烷分子的受保护氨基酸酯进行 N-氯化反应时,也观察到了极佳的结果,得到了(叔丁氧羰基氯氨基)环丙基乙酸甲酯(1-Cl)等衍生物、(苄氧羰基氯氨基)环丙基乙酸甲酯 (2-Cl)、1-(叔丁氧羰基氯氨基)环丙烷羧酸甲酯 (5-Cl) 和反式-2-(叔丁氧羰基氯氨基)环丙烷羧酸甲酯 (6-Cl) 等衍生物,收率分别为 99%、96%、90% 和 97%。