Catalytic asymmetric hydroboration with oxazaborolidines

Article abstract of DOI:10.1016/S0957-4166(00)82276-4

The cyclic secondary boranes derived from ephedrine and pseudoephedrine undergo rhodium complex-catalysed hydroboration of styrenes; both the regiochemistry and derived enantiomeric excess depend strongly on the structure of the catalyst with the ferrocenebiphosphine complex (12d) the most promising to date.