Umpolung Reactivity of Difluoroenol Silyl Ethers with Amines and Amino Alcohols. Application to the Synthesis of Enantiopure α-Difluoromethyl Amines and Amino Acids
摘要:
Difluoroenol silyl ethers, produced in situ from acylsilanes and CF3TMS, react as electrophiles with amines to give difluoroimines, via the corresponding hemiaminal adduct, as evidenced by F-19 NMR spectroscopy. Reaction with (R)-phenylglycinol led to 2-difluoromethyloxazolidines. After separation of the diastereomers, reduction with LAH and Strecker-type synthesis gave enantiopure alpha-difluoromethy-lamines and alpha-difluoromethyl-alpha-amino acids, respectively.
Optically active 1-Aryl-2-fluoro-substituted ethylamine and method for producing same
申请人:Ishii Akihiro
公开号:US20070191639A1
公开(公告)日:2007-08-16
The present invention relates to a method of producing an optically active 1-aryl-2-fluoro-substituted ethylamine compound of the formula [2] or a salt thereof by hydrogenolysis of an optically active secondary amine compound of the formula [1] or a salt thereof in the presence of a transition metal catalyst of Group VIII
[Chem. 59]
[where Ar represents an aryl group; n represents an integer of 1 or 2; and * represents an asymmetric carbon]
[Chem. 60]
[where Ar represents an aryl group; n represents an integer of 1 or 2; and * represents an asymmetric carbon].