Rhodium-catalyzed diastereoselective 1,2-addition of arylboronic acids to chiral trifluoroethyl imine
摘要:
Rhodium-catalyzed 1,2-addition of arylboronic acids 4a-j to chiral trifluoroethyl imine 3 afforded diastereomerically enriched sulfinamides 5a-j. The chiral auxiliary of the sulfinamide products was readily removed under acidic methanolysis to provide the corresponding trifluoroethylamine analogs 6a-j. (C) 2009 Elsevier Ltd. All rights reserved.
The synthesis of various trifluoromethylated amino compounds was studied using trifluoroacetaldehyde, an industrial bulk material, as a starting compound. One general application of trifluoroacetaldehyde is the preparation of trifluoroethylamino derivatives via reductive amination reaction. This synthesis includes the formation of the corresponding N,O-acetal intermediates followed by their reduction
2-(pyridin-2-yl) alkylamines via condensation of 2-alkylpyridines and chiral fluoromethyl N-tert-butyl sulfinyl imines with good diastereo-control and good chemical yields. The chiral N-tert-butyl sulfinyl auxiliary can be easily removed under mild acidic condition at room temperature. The application of this strategy was demonstrated in the synthesis of a fluorine-containing pesticide candidate.
[EN] ORGANIC COMPOUNDS FOR APPLICATIONS IN BACTERIAL INFECTIONS TREATMENT<br/>[FR] COMPOSÉS ORGANIQUES DESTINÉS À ÊTRE APPLIQUÉS DANS LE TRAITEMENT D'INFECTIONS BACTÉRIENNES
申请人:NOVARTIS AG
公开号:WO2010031750A1
公开(公告)日:2010-03-25
The present application describes organic compounds that are useful for the treatment, prevention and/or amelioration of human diseases.
本申请描述了对治疗、预防及/or改善人类疾病的有机化合物。
Efficient asymmetric synthesis of trifluoromethylated β-aminophosphonates and their incorporation into dipeptides
作者:Kostiantyn V. Turcheniuk、Kateryna O. Poliashko、Valery P. Kukhar、Alexander B. Rozhenko、Vadim A. Soloshonok、Alexander E. Sorochinsky
DOI:10.1039/c2cc36702e
日期:——
Addition of anions derived from dialkyl methylphosphonates to (Ss)-N-tert-butanesulfinyl (3,3,3)-trifluoroacetaldimine afforded (Ss,R) addition adducts in moderate to good yield (53â75%) with excellent diastereoselectivity (94â95% de). After selective removal of the N-sulfinyl group, dipeptides containing enantiomerically pure diethyl 2-amino-3,3,3-trifluoropropylphosphonate were synthesized to investigate the influence of the trifluoromethyl substituent on N-terminal coupling.
Asymmetric synthesis of β-trifluoromethyl-β-amino acids, including highly sterically constrained α,α-dialkyl derivatives
作者:Yanling Dai、Chen Xie、Haibo Mei、Jianlin Han、Vadim A. Soloshonok、Yi Pan
DOI:10.1016/j.tet.2015.10.071
日期:2015.12
Reported herein is asymmetric synthesis of β-trifluoromethyl-β-amino acids via Mannich addition reactionsbetween (Ss)-N-(tert-butanesulfinyl)-3,3,3-trifluoroacetaldimine and lithium enolates of alkyl acetates. In particular, the scope of this approach allows for preparation of the previously illusive, highly sterically constrained α,α-dialkyl-β-trifluoromethyl-β-amino acids. The method affords the