Desymmetrization of Prochiral Diaryl Sulfoxides by an Asymmetric Sulfoxide-Magnesium Exchange
作者:Thomas Hampel、Simon Ruppenthal、Daniel Sälinger、Reinhard Brückner
DOI:10.1002/chem.201103928
日期:2012.3.12
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.
据报道,前者通过不对称亚砜-镁交换反应使前手性二芳基亚砜1脱对称。相应的底物(1),i Pr 2 Mg和(S)-BINOL的二锂盐(原位制备)提供了(S)-配置的芳基异丙基亚砜2,产率高达91%,产率高达91 %ee。(S)‐BINOL可重新分离,收率为98%。