Internally Reuse Waste: Catalytic Asymmetric One-Pot Strecker Reaction of Fluoroalkyl Ketones, Anilines and TMSCN by Sequential Catalysis
作者:Yun-Lin Liu、Xiao-Ping Yin、Jian Zhou
DOI:10.1002/cjoc.201800001
日期:2018.4
enantioselective one‐pot facile synthesis of fluorinated Cα‐tetrasubstituted amino nitriles from α‐fluoroalkyl α‐aryl ketones, anilines, and TMSCN through a sequential p‐TsOH catalyzed ketimine formation and chiral bifunctional tertiaryamine mediated asymmetric Strecker reaction. This one‐pot approach has two important advantages. First, it greatly improves the overall yield of the synthesis of chiral Cα‐tetrasubstituted
Amines to an end: Highly opticallyactive α‐CF3‐functionalized amines can be obtained using metal‐free reaction conditions. The method involves the transfer hydrogenation of CF3‐substituted ketimines catalyzed by 1 and reductive amination of CF3‐substituted ketones. The synthetic utility of this method was demonstrated by the synthesis of a CF3 analogue of NPS R‐568. PMP=para‐methoxyphenyl.
Ethylene Glycol: A Powerful Catalyst‐Free Medium for CC Bond‐Forming Reactions
作者:Yun‐Lin Liu、Xing‐Ping Zeng、Jian Zhou
DOI:10.1002/asia.201200289
日期:2012.8
A good EG: Ethylene glycol (EG) is a catalyst‐free medium that can promote the highly efficient Strecker reaction of α‐CF2H or α‐CF3 ketoimines and TMSCN. EG was used in several reactions, including the catalyst‐free Morita–Baylis–Hillman reaction.
Catalytic Asymmetric Reduction of α-Trifluoromethylated Imines with Catecholborane by BINOL-Derived Boro-phosphates
作者:Hualing He、Xiaoxue Tang、Yang Cao、Jon C. Antilla
DOI:10.1021/acs.joc.0c03009
日期:2021.3.5
A catalytic enantioselective reduction of α-trifluoromethylated imines by a BINOL-derived boro-phosphate employing catecholborane as hydride source has been developed. This method provides an efficient route to prepare synthetically useful chiral α-trifluoromethylated amines in high yields and with excellent enantioselectivities (up to 98% yield and 96% ee) under mild conditions.