Chemo- and regioselectivity in the reactions between highly electrophilic fluorine containing dicarbonyl compounds and amines. Improved synthesis of the corresponding imines/enamines
作者:Hironari Ohkura、Dmitrii O. Berbasov、Vadim A. Soloshonok
DOI:10.1016/s0040-4020(03)00138-8
日期:2003.3
5,5,5-hexafluoropentane-2,4-dione) and various benzylamines were systematically studied. The results obtained lead to the development of a generalized and practical method for large-scale synthesis of the corresponding imines/enamines, useful starting materials for preparation fluorinated amines and amino acid.
N-Alkyl enamines can be transformed into 2,4,5-trisubsituted imidazoles by reacting with (diacetoxyiodo)benzene and TMSN3 under the catalysis of a copper salt such as Cu(OAc)2. Tetrabutyl ammonium iodide was also capable of promoting the reaction. The transformation from N-alkyl enamines into 2,4,5-trisubsituted imidazoles took place in a domino azidation/intramolecular C(sp3)–H amination pattern.
(E)- or (Z)-perfluorinated beta-enaminoesters were prepared by direct addition of primary or secondary amines to ethyl perfluoroalkynoates without any catalyst. (C) 2002 Elsevier Science B.V. All rights reserved.
(E)-或(Z)-全氟乙基β-联氨酸酯通过直接向乙基二氟乙炔酸酯中添加一元或二元胺制备,无需催化剂。 (C) 2002 Elsevier Science B.V. All rights reserved.
The present invention is directed to bicyclo[4.1.0]heptane pyrrolidine compounds which are agonists of orexin receptors. The present invention is also directed to uses of the compounds described herein in the potential treatment or prevention of neurological and psychiatric disorders and diseases in which orexin receptors are involved. The present invention is also directed to compositions comprising these compounds. The present invention is also directed to uses of these compositions in the potential prevention or treatment of such diseases in which orexin receptors are involved.
Catalytic asymmetric synthesis of β-fluoroalkyl-β-amino acids via biomimetic [1,3]-proton shift reaction
作者:Vadim A. Soloshonok、Alexander G. Kirilenko、Sergey V. Galushko、Valery P. Kukhar
DOI:10.1016/s0040-4039(00)73320-x
日期:1994.7
[1,3]-Protonshiftreaction of N-benzylenamines 1a-e, derived from β-polyfluoroalkyl-β-ketocarboxylic esters and benzylamine, was catalyzed by (-)-cinchonidine (5–13 mol %) to give good yields (67–89%) of enantiomerically enriched (up to 36% ee) N-benzylidene derivatives 3a-e. The resulting products 3a-e were readily hydrolyzed into the corresponding optically active (R)-β-polyfluoroalkyl-β-amino acids