Ni-Catalyzed Diastereoconvergent Intramolecular Alkene–Aldehyde Reductive Coupling: A Route to <i>syn</i>-Chromanols
作者:Sudipta Ghosh、Arnab Rooj、Rajesh Chakrabortty、Venkataraman Ganesh
DOI:10.1021/acs.orglett.4c01428
日期:——
nickel-catalyzed diastereoconvergent reductive coupling of a heteroatom-attached allyl moiety with aldehydes, viz., O-allyl, O-cinnamyl salicylaldehydes, and others, to afford syn-chromanols exclusively. The reaction proceeds through a [2 + 2 + 1] oxidative cycloaddition involving the active catalyst. This method is applicable to both terminal and internal olefin substrates. The formal syntheses of
我们首次证明了杂原子连接的烯丙基部分与醛(即O-烯丙基、 O-肉桂基水杨醛等)的镍催化非对映会聚还原偶联,专门提供顺式苯并二氢吡喃醇。该反应通过涉及活性催化剂的[2+2+1]氧化环加成进行。该方法适用于末端烯烃和内烯烃底物。 CP-199.330、CP-199.331 和 CP-85.958 的正式合成已得到证实。对照实验、质谱分析和DFT研究支持了合理的机制和排他性顺式选择性的起源。