Palladium(II)-Catalyzed Enantioselective Synthesis of α-(Trifluoromethyl)arylmethylamines
作者:Thomas Johnson、Bo Luo、Mark Lautens
DOI:10.1021/acs.joc.6b00657
日期:2016.6.17
We describe a method for the synthesis of α-(trifluoromethyl)arylmethylamines that consists of the palladium(II)-catalyzed addition of arylboroxines to imines derived from trifluoroacetaldehyde. Palladium acetate is used as a catalyst with electron-neutral or electron-rich arylboroxines, and it was found that addition of an ammonium or silver salt was crucial to promote the reaction of electron-poor
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.
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.