Desymmetrization of prochiral diaryl sulfoxides by an asymmetric sulfoxide-magnesium exchange
The first desymmetrizations of prochiral diaryl sulfoxides 1 by an asymmetric sulfoxide-magnesium exchange reaction are reported. The respective substrate (1), iPr2Mg, and the dilithium salt of (S)-BINOL (which was prepared in situ) provided (S)-configured aryl isopropyl sulfoxides 2 in up to 91 % yield and with up to 91 % ee. (S)-BINOL was re-isolable in 98 % yield. Copyright
Catalytic asymmetric diethylzinc addition to diphenylphosphionyl imines using chiral tert-butanesulfinylphosphine ligands
A class of novel chiral tert-butanesulfinylphosphine ligands were designed and synthesized by a concise two-step route with high yields. High activities and enantioselectivities (up to 94% ee) were achieved when using them in catalytic asymmetric diethylz