C−C Bond-Forming Strategy by Manganese-Catalyzed Oxidative Ring-Opening Cyanation and Ethynylation of Cyclobutanol Derivatives
作者:Rongguo Ren、Zhen Wu、Yan Xu、Chen Zhu
DOI:10.1002/anie.201510973
日期:2016.2.18
cyano C1 unit and ethynyl C2 unit are regiospecifically introduced to the γ‐position of ketones at room temperature, providing a mild yet powerful method for production of elusive aliphatic nitriles and alkynes. All transformations described are based on a common sequence: 1) oxidative ring‐opening of cyclobutanol substrates by C−C bond cleavage; 2) radical addition to triple bonds bearing an arylsulfonyl
be prepared by the titanium(III)‐catalyzed reductive radical cyclization of iminonitriles. Depending on the position of the nitrile at the imine carbon or nitrogen, cyclic aminoketones or pyrrolidin‐3‐ones with a tetrasubstituted α‐carbon can be formed in up to quantitative yield. In the latter case, the imine condensation and TiIII catalysis correspond to a formal [4+1] cycloaddition.