Fates of imine intermediates in radical cyclizations of <i>N</i>-sulfonylindoles and ene-sulfonamides
作者:Hanmo Zhang、E Ben Hay、Stephen J Geib、Dennis P Curran
DOI:10.3762/bjoc.11.181
日期:——
imine intermediates formed on radical cyclizations of ene-sulfonamides have been identified, reduction and hydration/fragmentation. Tin hydride-mediated cyclizations of 2-halo-N-(3-methyl-N-sulfonylindole)anilines provide spiro[indoline-3,3'-indolones] or spiro-3,3'-biindolines (derived from imine reduction), depending on the indole C2 substituent. Cyclizations of 2-haloanilide derivatives of 3-carboxy-N-sulfonyl-2
已经鉴定了在烯属磺酰胺的自由基环化反应中形成的两种新的亚胺中间体,还原和水合/碎片化。氢化锡介导的2-卤代-N-(3-甲基-N-磺酰吲哚)苯胺的环化反应可提供螺[吲哚啉-3,3'-吲哚酮]或螺-3,3'-二吲哚啉(源自亚胺还原),取决于吲哚C2取代基。3-羧基-N-磺酰基-2,3-二氢吡咯的2-卤代苯胺衍生物的环化也可能形成螺亚胺作为主要产物。然而,内酰胺羰基通过水合和逆克莱森型反应的新途径促进了这些环状亚胺的开环,从而提供了重排的2-(2'-甲酰胺基乙基)氧吲哚。