Photolyses of the thiohydroximate ester derivatives 13 and 21 of the 4- (benzyl-seleno)-2-azetidinoines 7 and 20, afford the 1-aza-7-oxo-4-selenabicyclo- [3.2.0]heptane ring systems 14 and 21 in good to moderate yield in processes that presumably involve intramolecular homolytic substitution at selenium with expulsion of benzyl radical. Extension of this methodology to the preparation of derivatives 24 of 12,2a-dihydro-1H,8H-azeto[2,1-b][1,3]benzoselenazin-1-one (22) is also described.
4- (苄基-
硒基)-2-氮杂
环丁烷 7 和 20 的
硫代羟基酯衍
生物 13 和 21 在光解过程中得到 1-aza-7-oxo-4-selenabicyclo- [3.2.0]
庚烷环系统 14 和 21,收率从好到中等。此外,还介绍了将这种方法扩展到 12,2a-二氢-1H,8H-氮杂环丁并[2,1-b][1,3]苯并
硒嗪-1-酮 (22) 的衍
生物 24 的制备过程。