Enantioselective Synthesis of Cyclopropanes That Contain Fluorinated Tertiary Stereogenic Carbon Centers: A Chiral α-Fluoro Carbanion Strategy
作者:Xiao Shen、Wei Zhang、Lei Zhang、Tao Luo、Xiaolong Wan、Yucheng Gu、Jinbo Hu
DOI:10.1002/anie.201202451
日期:2012.7.9
Chiral transfer: The fluorinated sulfoximine (see scheme; Ts=p‐toluenesulfonyl) was synthesized and used as the first chiral fluoromethylenation reagent for the synthesis of cyclopropanes that contain fluorinated tertiary stereogenic carbon centers in good yields, good diastereoselectivity, and excellent enantioselectivity.
Radical-Cation Vinylcyclopropane Rearrangements by TiO<sub>2</sub> Photocatalysis
作者:Naoya Maeta、Hidehiro Kamiya、Yohei Okada
DOI:10.1021/acs.joc.0c00544
日期:2020.5.15
Radicalcation vinylcyclopropane rearrangements by TiO2 photocatalysis in lithium perchlorate/nitromethane solution are described. The reactions are triggered by oxidative single electron transfer, which is followed by immediate ring-opening of the cyclopropanes to generate distonic radicalcations as unique reactive intermediates. This approach can also be applied to vinylcyclobutane, leading to the