K. Mikami et al., CONFORMATIONAL CONTROL IN PROTON SOURCES FOR ENANTIOSELECTIVE PROTONATION OF SAMARIUM ENOLATE DERIVED FROM ALPHA-METHOXY-SUBSTITUTED KETONES, Synlett, (6), 1998, pp. 607
High enantioselectivity is achieved in the asymmetric protonation of s
amarium enolate, regioselectively generated by SmI2-mediated reduction
of 2-methoxy-substituted cyclohexanones using achiral diamine- or pro
-atropisomeric 2,2'-biphenol-derived chiral diols as proton sources by
virtue of the conformational control.