Photoredox Ni-Catalyzed Branch-Selective Reductive Coupling of Aldehydes with 1,3-Dienes
作者:Yan-Lin Li、Wen-Duo Li、Zheng-Yang Gu、Jie Chen、Ji-Bao Xia
DOI:10.1021/acscatal.9b05137
日期:2020.1.17
We report here a Ni-catalyzed reductive coupling of aldehydes with widely available 1,3-dienes under visible-light photoredox dual catalysis. The homoallyic alcohols are obtained in broad scope with complete branched regioselectivity. Hantzsch ester is used as the hydrogen radical source to oxidize low-valent nickel salt affording Ni–H species. Preliminary mechanistic studies indicate a successive
我们在这里报道了在可见光光氧化还原双重催化下,镍与广泛可用的1,3-二烯的镍催化还原偶联反应。均聚物醇是在宽范围内获得的,具有完全的支链区域选择性。Hantzsch酯用作氢自由基源,可氧化提供Ni-H的低价镍盐。初步的机理研究表明,在这种协同催化过程中,通过Ni-H插入1,3-二烯,产生了连续的单电子转移(SET)路径和关键的π-烯丙基镍中间体的生成。