Abstract
The sense of enantioselectivity in asymmetric dearomative amination of β-naphthols is reported to pivotally depend on the 3,3' substituents on the chiral BINOL-phosphoric acid (CPA) catalysts. The origin of reversal in the sense of stereoinduction from R to S, when the aryl substituent is changed from 3,5-(CF3)2-C6H3 (CPA-1) to 9-anthryl (CPA-2), has been identified as arising due to the change in the pattern of noncovalent interactions (from predominantly C-H···F to C-H···π interactions) in the stereocontrolling transition states.
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