A very easy access to new trifluoromethyl-hydroxyethylamine (Tf-HEA) derivatives by epoxide ring opening with amino-containing compounds, including aliphatic amines, aniline, aqueous ammonia, hydroxylamine, hydrazine, amino acids and a dipeptide, is described herein. The reactions were carried out in protic solvents, without the use of any catalyst or any other additive. A comparison of the efficiency
Biomimetic reductive amination under the continuous-flow reaction conditions
作者:Vadim A. Soloshonok、Hector T. Catt、Taizo Ono
DOI:10.1016/j.jfluchem.2009.10.013
日期:2010.2
account of continuous-flow reaction conditions for biomimeticreductiveamination of fluorinated carbonyl compounds to corresponding amines and amino acids of biomedical importance. We demonstrate that simple silica-adsorbed DBU can be used as efficient catalysts for on-column 1,3-proton shift reaction, a key transformation in the biomimeticreductiveamination process. This new on-column process features
Nucleophile-Directed Selective Transformation of<i>cis</i>-1-Tosyl-2-tosyloxymethyl-3-(trifluoromethyl)aziridine into Aziridines, Azetidines, and Benzo-Fused Dithianes, Oxathianes, Dioxanes, and (Thio)morpholines
作者:Sara Kenis、Matthias D'hooghe、Guido Verniest、Maaike Reybroeck、Tuyet Anh Dang Thi、Chinh Pham The、Tham Thi Pham、Karl W. Törnroos、Nguyen Van Tuyen、Norbert De Kimpe
DOI:10.1002/chem.201204485
日期:2013.5.3
cis‐1‐tosyl‐2‐tosyloxymethyl‐3‐(trifluoromethyl)aziridine was developed, starting from 1‐ethoxy‐2,2,2‐trifluoroethanol, involving imination, aziridination, ester reduction, hydrogenation, and N‐,O‐ditosylation steps. Further syntheticelaborations revealed a remarkable difference in the reactivity of cis‐1‐tosyl‐2‐tosyloxymethyl‐3‐(trifluoromethyl)aziridine with respect to aromatic sulfur and oxygen nucleophiles,
Highly Diastereo- and Enantioselective Vinylogous Mannich Reactions of Fluorinated Aldimines with Siloxyfurans
作者:Qian-Yi Zhao、Zhi-Liang Yuan、Min Shi
DOI:10.1002/adsc.201000843
日期:2011.3.7
A highly regio‐ and enantioselective asymmetric vinylogousMannichreaction of readily available fluorinatedaldimines bearing a chiral auxiliary [(S)‐1‐phenylethyl group] with siloxyfurans to afford chiral fluorine‐containing γ‐butenolide or γ‐lactone derivatives has been developed in the presence of silver acetate (10 mol%) and axially chiral phosphine‐oxazoline ligand L1 (11 mol%). In most cases
BF<sub>3</sub>-Promoted Aromatic Substitution of<i>N</i>-Alkyl<i>α</i>-Trifluoromethylated Imine: Facile Synthesis of 1-Aryl-2,2,2-trifluoroethylamines
作者:Yuefa Gong、Katsuya Kato、Hiroshi Kimoto
DOI:10.1246/bcsj.75.2637
日期:2002.12
The aromaticsubstitution of three representative N-alkyl trifluoromethyl imines 1a–c (R: a, benzyl; b, benzhydryl; c, methyl), obtained from primary alkyl amines and trifluoroacetaldehyde ethyl hemiacetal, was used to investigate the preparation of 1-aryl-2,2,2-trifluoroethylamines. In the presence of BF3·OEt2, the reaction of imine 1 with various aromaticcompounds proceeded smoothly at room temperature