SPANphos Ligands in Palladium-Catalyzed Asymmetric Fluorination
作者:Olivier Jacquet、Nicolas D. Clément、Carolina Blanco、Marta Martinez Belmonte、Jordi Benet-Buchholz、Piet W. N. M. van Leeuwen
DOI:10.1002/ejoc.201200223
日期:2012.9
The synthesis of new enantiopure wide-bite-angle diphosphanes is described as well as their use in the palladium-catalyzedasymmetricfluorination of α-cyanoacetates. Enantiomeric excesses up to 93 % were obtained when Pd(OAc) 2 -SPANphos was used as catalyst for the fluorination of ethyl 2-cyano-2-phenylacetate with N-fluorobenzenesulfonimide (NFSI).
Visible Light-Promoted Radical-Mediated Ring-Opening/Cyclization of Vinyl Benzotriazoles: An Alternative Approach to Phenanthridines
作者:Jiaqi Li、Shichong Wang、Jingjing Zhao、Pan Li
DOI:10.1021/acs.orglett.2c02249
日期:2022.8.19
tion of vinyl benzotriazoles has been developed. The method provides an efficient and practical approach to synthesize functionalized phenanthridinesfrom vinyl benzotriazoles with alkyl bromides under mild conditions. Significantly, the readily available and bench-stable vinyl benzotriazoles can serve as valuable alternative radical acceptors during the synthesis of phenanthridines.
Radical-Mediated Heck-Type Alkylation: Stereoconvergent Synthesis of Functionalized Polyenes
作者:Hong Zhang、Xinxin Wu、Yunlong Wei、Chen Zhu
DOI:10.1021/acs.orglett.9b02838
日期:2019.9.20
The stereospecific synthesis of polyenes is of great synthetic value. Disclosed herein is a new, efficient, stereoconvergent approach for the synthesis of functionalized polyenes via a radical-mediated Heck-type alkylation. The easily accessed Z- and E-mixed alkenes are harnessed as starting material, leading to a unique stereoisomer of polyenes. In addition, the transformation features mild reaction