Aminofluorination of Cyclopropanes: A Multifold Approach through a Common, Catalytically Generated Intermediate
作者:Cody Ross Pitts、Bill Ling、Joshua A. Snyder、Arthur E. Bragg、Thomas Lectka
DOI:10.1021/jacs.6b02838
日期:2016.5.25
We have discovered a highly regioselective aminofluorination of cyclopropanes. Remarkably, four unique sets of conditions-two photochemical, two purely chemical-generated the same aminofluorinated adducts in good to excellent yields. The multiple, diverse ways in which the reaction could be initiated provided valuable clues that led to the proposal of a "unifying" chain propagation mechanism beyond
Catalytic Asymmetric Bromination of Unfunctionalized Olefins with H<sub>2</sub>O as a Nucleophile
作者:Xun Zhang、Jing Li、Hua Tian、Yian Shi
DOI:10.1002/chem.201502133
日期:2015.8.10
The dimeric cinchona alkaloid (DHQD)2PHAL is used to catalyze an effective asymmetric bromohydroxylation of unfunctionalized olefins with H2O as nucleophile an N‐bromobenzamide as a bromine source. A variety of optically active bromohydrins are formed with up to 88 % ee.