Mn(III)-based oxidative free radical cyclizations of unsaturated 2-cyclohexenones and aldehydes
作者:Barry B Snider、Eugenia Y Kiselgof
DOI:10.1016/0040-4020(96)00234-7
日期:1996.4
Oxidative free-radical cyclizations of unsaturated 2-cyclohexenones 9a, 9b, 17, and 24 with Mn(OAc)3 afford unsaturated α′-keto radicals such as 10 that cyclize to afford bicyclic products. The major process with 2-cyclohexenone 27 is conjugate addition of acetate to form β-acetoxy α-keto radical 37. Unsaturatedaldehydes 45, 57a, and 57b are oxidized to radicals that cyclize to give cyclopentane- and