Room-temperature enantioselective C-H iodination via kinetic resolution.
Room-temperature enantioselective C-H iodination via kinetic resolution.
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DOI:
10.1126/science.1258538
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发表时间:
2014-10-24
期刊:
影响因子:
--
通讯作者:
Yu JQ
中科院分区:
文献类型:
--
作者:
Chu L;Xiao KJ;Yu JQ
The development of asymmetric C–H activation reactions through metal insertions remains in its infancy. The commonly used approach is the desymmetrization of prochiral C–H bonds on the same or different carbons of one achiral molecule using a chiral catalyst. Herein, we report a Pd-catalyzed enantioselective C–H activation reaction via kinetic resolution in which one of the enantiomers of the racemic substrates undergoes faster C–H insertion with the chiral catalysts thereby producing enantioenriched C–H functionalization products that are not accessible via desymmtrization of prochiral C–H bonds. The exceedingly high relative rate (kfast/kslow up to 244) and the subsequent iodination of the remaining enantiomerically enriched starting material using a chiral ligand with the opposite configuration allows for the conversion of both enantiomers of amines into enantiomerically pure iodinated amines.
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