作者:S. D. Sharma、Usha Mehra、J. P. S. Khurana、S. B. Pandhi
DOI:10.1055/s-1987-28144
日期:——
Cycloaddition of dithiocarbonimidate 1 to the ketene generated in situ from phenoxyacetylchloride in the presence of triethylamine affords the 4-dithioalkyl-2-azetidinones 2 in good yields. Facile conversion of 2 to the 4-unsubstituted ß-lactams 3 can be accomplished by desulfurization with Raney-Nickel. Formation of several interesting products during attempts to bring a carbonyl function at C-4 in 2 has also been described.
在三乙胺存在下,二硫代羰酰亚胺 1 与苯氧乙酰氯原位生成的烯酮进行环加成反应,可以得到 4-二硫代烷基-2-氮杂环丁酮 2,收率很高。通过使用雷尼-镍进行脱硫,可以将 2 便捷地转化为 4-未取代的 ß-内酰胺 3。在尝试将 2 中 C-4 的羰基官能团转化为 4-未取代的 ß-内酰胺 3 的过程中,还出现了几种有趣的产物。