Umpolung of Hemiaminals: Titanocene-Catalyzed Dehydroxylative Radical Coupling Reactions with Activated Alkenes
作者:Xiao Zheng、Xi-Jie Dai、Hong-Qiu Yuan、Chen-Xi Ye、Jie Ma、Pei-Qiang Huang
DOI:10.1002/anie.201210088
日期:2013.3.18
Radical measures: A radical coupling reaction, which is proposed to proceed through in situ chlorination of a hydroxy group by Me3SiCl, is used to form quaternary carbon centers with amino groups in α position. The reaction can be scaled up and is used in an efficient six‐step total synthesis of (±)‐9,10‐diepi‐stemoamide (see scheme, Cp=cyclopentadienyl, EWG=electron‐withdrawing group).
自由基措施:提出通过Me 3 SiCl原位氯化羟基进行的自由基偶联反应,用于形成氨基位于α位的季碳中心。该反应可以按比例放大,并用于高效的六步全合成(±)-9,10-diepi-stemoamide(参见方案,Cp =环戊二烯基,EWG =吸电子基团)。