Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 50, Pages 16431-16435Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201810328
Keywords
Bronsted acid; difluorination; enantioselectivity; iodine; organocatalysis
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Funding
- WWU Munster
- DFG: Cells in Motion, Cluster of Excellence (CiM) [FF-2013-10]
- SFB 858
- European Research Council [336376-ChMiFluorS]
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The enantioselective, catalytic vicinal difluorination of alkenes is reported by I-I/I-III catalysis using a novel, C-2-symmetric resorcinol derivative. Catalyst turnover via in situ generation of an (ArIF2)-F-III species is enabled by Selectfluor oxidation and addition of an inexpensive HF-amine complex. The HF:amine ratio employed in this process provides a handle for regioselective orthogonality as a function of BrOnsted acidity. Selectivity reversal from the 1,1-difluorination pathway (geminal) to the desired 1,2-difluorination (vicinal) is disclosed (>20:1 in both directions). Validation with electron deficient styrenes facilitates generation of chiral bioisosteres of the venerable CF3 unit that is pervasive in drug discovery (20 examples, up to 94:06 e.r.). An achiral variant of the reaction is also presented using p-TolI (up to >95% yield).
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