Nondynamic Kinetic Resolution of Configurationally Stable Biaryl Lactones by Reduction with Oxazaborolidine-Activated Borane: AM1 Studies and Experimental Verification
The complete mechanistic course of the atroposelective ring opening of a lactone-bridged biaryl, dinaphth[2,1-c:1',2'-e]oxepin-3-(5H)-one (3), with a chiral oxazaborolidine-BH3 complex was calculated using the semiempirical AM1 method. The first hydride transfer to the activated carbonyl function of the adduct complexes was elaborated to be the selectivity-determining step in the postulated five-step