A three‐component coupling between alkanes, CO, and electron‐deficient alkenes in the presence of a catalytic amount of (nBu4N)4W10O32 (TBADT) has resulted in the efficient formation of unsymmetrical ketones. This process is based on the carbonylation of alkyl radicals photocatalytically generated by CH activation of alkanes and the subsequent addition to alkenes (see scheme; EWG=electron‐withdrawing
在催化量为(n Bu 4 N)4 W 10 O 32(TBADT)的存在下,烷烃,CO和缺电子烯烃之间的三组分偶联导致有效形成不对称酮。此过程基于烷烃的CH活化光催化产生的烷基的羰基化反应,随后将其添加到烯烃中(请参见方案; EWG =吸电子基团)。
Carbonylation of Alkyl Radicals Derived from Organosilicates through Visible‐Light Photoredox Catalysis
Primary, secondary, and tertiary alkyl radicals formed by the photocatalyzed oxidation of organosilicates underwent efficient carbonylation with carbon monoxide (CO) to give a variety of unsymmetrical ketones. This study introduces the possibility of radical carbonylation under a photooxidative regime.
Metal-Free CH Bond Activation of Branched Aldehydes with a Hypervalent Iodine(III) Catalyst under Visible-Light Photolysis: Successful Trapping with Electron-Deficient Olefins
作者:Shin A. Moteki、Asuka Usui、Sermadurai Selvakumar、Tiexin Zhang、Keiji Maruoka
DOI:10.1002/anie.201406513
日期:2014.10.6
of a hypervalentiodine(III) catalystunder visible light photolysis allows a mild way of generating acyl radicals from various branchedaldehydes, thereby giving the corresponding hydroacylated products almost exclusively. Another characteristic feature of this approach is the catalytic use of hypervalentiodine(III) reagent, which is a rare example on the generation of radicals in hypervalent iodine