Photochemical radical cyclization of γ,δ-unsaturated ketone oximes to 3,4-dihydro-2H-pyrroles
作者:Mitsuru Kitamura、Yutaka Mori、Koichi Narasaka
DOI:10.1016/j.tetlet.2005.02.062
日期:2005.4
4-Dihydro-2H-pyrroles are synthesized from γ, δ-unsaturated oximes by photochemical radical cyclization with 1,5-dimethoxynaphthalene (DMN) as the sensitizer. The cyclization of alkyl ketone O-acetyloximes proceeds via photosensitized electron transfer in the presence of acetic acid, while conjugated oximes of aryl and α,β-unsaturated ketones are cyclized via energy transfer.
通过以1,5-二甲氧基萘(DMN)为光敏剂的光化学自由基环化反应,由γ,δ-不饱和肟合成3,4-Dihydro-2 H-吡咯。烷基酮O-乙酰肟的环化反应是在乙酸存在下通过光敏电子转移进行的,而芳基和α,β-不饱和酮的共轭肟则通过能量转移而被环化。