3,6-Dihydropyridines from 6-endo radical cyclisation onto nitrogen in β-allenyl ketoximebenzoates
作者:Michaël Depature、Didier Siri、Jacques Grimaldi、Jacques Hatem、Robert Faure
DOI:10.1016/s0040-4039(99)00806-0
日期:1999.6
When tosyl bromide is added under free radical conditions to β-allenyl-1-phenylketoximebenzoates, a carbon-centred radical resulting from the addition of the tosyl radical on the sp carbon is formed. Depending on the substitution pattern of the allenyl moiety, this carbon-centred radical traps a bromine atom or undergoes a rare 6-endo cyclisation onto the nitrogen atom leading to 3,6-dihydropyridines
当在自由基条件下将甲苯磺酰基溴添加到β-烯丙基-1-苯基酮肟肟苯甲酸酯中时,形成了由于在sp碳上添加甲苯磺酰基而形成的碳中心自由基。根据烯基部分的取代方式,该碳中心自由基捕获溴原子或在氮原子上进行罕见的6-内环化,从而以高收率生成3,6-二氢吡啶。