Generation and Trapping of Alkene Radical Cations under Nonoxidizing Conditions: Formation of Six-Membered Rings by <i>E</i><i>xo</i>- and <i>E</i><i>ndo</i>-Mode Cyclizations
作者:David Crich、Santhosh Neelamkavil
DOI:10.1021/ol026204x
日期:2002.7.1
[reaction: see text] It is demonstrated that alkene radicalcations generated by the radical ionic fragmentation of beta-(phosphatoxy)alkylradicals undergo efficient nucleophilic capture by amines in either the 6-exo or 6-endo modes, leading to six-membered nitrogen heterocycles. Suitable placement of an alkene enables the juxtaposition of a radical cyclization resulting in the formation of both the