N-TMS-β,β-difluoroenamines: Electrochemical preparation and its transformation
摘要:
The first preparation of N-trimethylsilylated beta,beta-difluoroenamines (2) from the trifluoromethyl imines (1) by electrochemical reduction and a preliminary study on alkylation of 2 for the synthesis of difluoromethylene compounds are described. (C) 1998 Elsevier Science Ltd. All rights reserved.
N-TMS-β,β-difluoroenamines: Electrochemical preparation and its transformation
作者:Kenji Uneyama、Tsuyoshi Kato
DOI:10.1016/s0040-4039(97)10613-x
日期:1998.2
The first preparation of N-trimethylsilylated beta,beta-difluoroenamines (2) from the trifluoromethyl imines (1) by electrochemical reduction and a preliminary study on alkylation of 2 for the synthesis of difluoromethylene compounds are described. (C) 1998 Elsevier Science Ltd. All rights reserved.
Difluoromethylaziridines were synthesized by the reaction of dimethylsulfonium methylide with difluoroenamines which were easily prepared from trifluoromethylimines by magnesium-promoted defluorosilylation. (C) 2002 Elsevier Science Ltd. All rights reserved.
First synthesis of 3,3-difluoroserine and cysteine derivatives via Mg(0)-promoted selective CF bond cleavage of trifluoromethylimines
作者:Masayuki Mae、Hideki Amii、Kenji Uneyama
DOI:10.1016/s0040-4039(00)01350-2
日期:2000.10
3,3-Difluoroserine and cysteine derivatives were synthesized via Mg(0)-promoted defluorination of trifluoromethylimines as a key step, followed by addition of alcohols and sulfenyl chloride, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.
Catalytic Route to the Synthesis of Optically Active β,β-Difluoroglutamic Acid and β,β-Difluoroproline Derivatives
amino acidderivatives were synthesized via Mg(0)-promoted defluorination of α-trifluoromethyl iminoester. Bromination of the difluoroenamine afforded the bromodifluoromethyl iminoester in good yield. Pd-catalyzed asymmetric hydrogenation of the bromodifluoromethyl iminoester and the subsequent transformations provided opticallyactive β,β-difluoroglutamic acid and β,β-difluoroproline derivatives.