Tandem superelectrophilic hydroarylation of C C bond and carbonyl reduction in cinnamides: synthetic rout to 3,3-diarylpropylamines, valuable pharmaceuticals
摘要:
Cinnamides ArCH=CHCONRR' in reactions with arenes Ar'H under the action of Bronsted (TfOH, FSO3H) or Lewis (AlBr3) superacids at rt for 1-2 h give C=C bond hydroarylation products ArAr'CHCH2CONRR' in yields of 63-98%. Reduction (LiAlH4/Et2O) of carbonyl group in the latter results in the formation of 3,3-diarylpropylamines ArAr'CHCH2CH2NRR', valuable drugs. The reaction intermediates, superelectrophilic dications ArC+H-CH2C(OH+)NRR', have been characterized by DFT calculations in terms of global electrophilicity index, natural charges, and atomic orbitals contributions. (C) 2014 Elsevier Ltd. All rights reserved.
Sulfonyl amide inhibitors of calcium channel function
申请人:Hangeland J. Jon
公开号:US20050245535A1
公开(公告)日:2005-11-03
Compounds of formula I
its stereoisomers, solvates, and salts, thereof, wherein: a, b, c, d, f, n, m and Ra are defined herein are are inhibitors of calcium channel function, and are useful in treating calcium channel-dependent disorders, including hypertension.
This invention relates to novel 1-hydroxyimino-3-phenyl-propanes of the formula (I) wherein R1 to R10 are as defined in the description and in the claims, as well as pharmaceutically acceptable salts thereof. These compounds are GPBAR1 agonists and may be used as medicaments for the treatment of diseases such as type II diabetes.
The acid-mediated ring opening reactions of α-aryl-lactams
作者:Frank D. King、Stephen Caddick
DOI:10.1039/c2ob00012a
日期:——
4-Aryl-azetidin-2-ones (β-lactams) undergo ring opening with triflic acid to give cinnamamides which, in benzene, react further to give 3-aryl-3-phenyl-propionamides. Prolonged reaction times in benzene give 3,3-diphenyl-propionamide via an aryl/phenyl exchange. Lactams of ring size 7 and higher also ring open, but only 7- and 8-membered rings give pure diphenylalkylamides. AlCl3 only ring opens the 4-aryl-azetidinones.
The reductive activation of chemical bonds at less negative potentials provides a foundation for high functional group tolerance and selectivity, and it is one of the central topics in organic electrosynthesis. Along this line, we report the design of a dual-activation mode by merging electro-reduction with hydrogen bonding activation. As a proof of principle, the reduction potential of N-phenylpropiolamide