Isotope Effect Studies on Elimination Reactions. IX. The Nature of the Transition State for the E2 Reaction of 2-Arylethylammonium Ions with Ethoxide in Ethanol
作者:P. J. Smith、A. N. Bourns
DOI:10.1139/v74-118
日期:1974.3.1
Kineticisotopeeffects have been determined for the E2 reaction of some 2-arylethyltrimethyl-ammonium ions with ethoxide in ethanol at 40°. The nitrogen effect, (k14/k15 − 1)100, decreased with increasing electron-withdrawing ability of the para substituent; i.e. 1.37, 1.33, 1.14, and 0.88 for p-OCH3, p-H, p-Cl, and p-CF3, respectively. Furthermore, the primaryhydrogen–deuteriumisotopeeffects increased
A copper‐catalyzedreductivecross‐coupling reaction of nonactivated alkyl tosylates and mesylates with alkyl and arylbromides was developed. It provides a practical method for efficient and cost‐effective construction of aryl–alkyl and alkyl–alkyl CC bonds with stereocontrol from readily available substrates. When used in an intramolecular fashion, the reaction enables convenient access to various
Synthesis and Pharmacological Evaluation of 1-Alkyl-N-[(1R)-1-(4-fluorophenyl)-2-methylpropyl]piperidine-4-carboxamide Derivatives as Novel Antihypertensive Agents
We synthesized and evaluated inhibitory activity against T-type Ca2+ channels for a series of 1-alkyl-N-[(1R)-1-(4-fluorophenyl)-2-methylpropyl]piperidine-4-carboxamide derivatives. Structure–activity relationship studies have revealed that the isopropyl substituent at the benzylic position plays an important role in exerting potent inhibitory activity, and the absolute configuration of the benzylic position was found to be opposite that of mibefradil, which was first launched as a new class of T-type Ca2+ channel blocker. Oral administration of N-[(1R)-1-(4-fluorophenyl)-2-methylpropyl]-1-[2-(3-methoxyphenyl)ethyl]piperidine-4-carboxamide (17f) lowered blood pressure in spontaneously hypertensive rats without inducing reflex tachycardia, an adverse effect often caused by traditional L-type Ca2+ channel blockers.
Pharmaceutical compositions and methods of treating hypertension
申请人:John Wyeth & Brother Limited
公开号:US04029801A1
公开(公告)日:1977-06-14
Pharmaceutical compositions containing a group of heterocyclic compounds and their use in treatment of disorders and diseases of the cardiovascular system and/or in the treatment of superficial and deep allergic phenomena is described. These compounds used in the composition and/or methods are piperidine compounds linked by the nitrogen atom to a substituted or unsubstituted cycloalkyl, aryl or heterocyclic radical through the intermediary of a group selected from a lower-alkylene radical, a monoketo lower-alkylene radical or a hydroxy-lower-alkylene radical, or a bivalent radical of the formula --NH.CO.(CH.sub.2).sub.n -- where n is 1, 2 or 3, ##STR1## or --0-(lower-alkylene)--. The piperidine ring is further substituted by an acylamino residue.
Opioid ligands with mixed properties from substituted enantiomeric <i>N</i>-phenethyl-5-phenylmorphans. Synthesis of a µ-agonist δ-antagonist and δ-inverse agonists
作者:Kejun Cheng、In Jong Kim、Mei-Jing Lee、Steven A. Adah、Tyler J. Raymond、Edward J. Bilsky、Mario D. Aceto、Everette L. May、Louis S. Harris、Andrew Coop、Christina M. Dersch、Richard B. Rothman、Arthur E. Jacobson、Kenner C. Rice
DOI:10.1039/b618875c
日期:——
A novel potent non-peptide morphine-like antinociceptive with μ-agonist and δ-antagonist properties represents a lead towards non-dependence producing analgesics.