近十年来许多有机硒试剂被引进有机合成中以促进碳—碳键的形成、氯代反应、环氧化作用、烯烃转化为烯醇以及酮变为烯酮等反应。然而更重要的是有机硒试剂能引发环化作用,它是合成内酯、环醚、含硫杂环、含氮杂环和碳环的优秀试剂。由于用有机硒试剂进行环化作用时不但反应条件温和且具有高度的区域选 In recent decades, many organic selenium reagents have been introduced into organic synthesis to promote the formation of carbon-carbon bonds, chlorination, epoxidation, conversion of olefins to enols and ketones to enones and other reactions. More importantly, however, organic selenium reagents can initiate cyclization and are excellent reagents for the synthesis of lactones, cyclic ethers, sulfur-containing heterocycles, nitrogen-containing heterocycles and carbocycles. Due to the cyclization with organic selenium reagents not only mild reaction conditions and a high degree of regional selection