Arylethanolamines derived from salicylamide with .alpha.- and .beta.-adrenoceptor blocking activities. Preparation of labetalol, its enantiomers and related salicylamides
作者:James E. Clifton、Ian Collins、Peter Hallett、David Hartley、Lawrence H. C. Lunts、Philip D. Wicks
DOI:10.1021/jm00348a013
日期:1982.6
A series of phenethanolamines (3) based on salicylamide has been prepared and shown to possess beta-adrenergic blocking properties. When the basic nitrogen atom was substituted by some aralkyl groups, the compounds also blocked alpha-adrenoceptors. The 1-methyl-3-phenylpropyl derivative labetalol (34) is antihypertensive in animals and man, and syntheses of its four stereoisomers are described. The
Palladium(<scp>II</scp>)-catalysed oxidation of carbon–carbon double bonds of allylic compounds with molecular oxygen; regioselective formation of aldehydes
Treatment of N-allylamides 1aâc and lactams 1dâf with molecular oxygen in the presence of [PdCl2(MeCN)2]âCuCl catalyst in anhydrous 1,2-dichloroethane containing hexamethylphosphoric triamide gives the corresponding aldehydes 2 regioselectively, while methyl ketones 3 become the major products in the presence of water.
<i>gem</i>-Difluorination of Aminoalkynes via Highly Reactive Dicationic Species in Superacid HF−SbF<sub>5</sub>: Application to the Efficient Synthesis of Difluorinated Cinchona Alkaloid Derivatives
reacted in the superacid system HF−SbF5 to give regioselectively new β-gem-difluoroamines. The reaction, which is not observed in pure HF, is consistent with the formation of a dicationic intermediate (i.e., both vinylic and adjacent protonated N-ammonium cations). Application to the regioselective and efficient synthesis of difluorinated cinchona alkaloid derivatives is described.
straightforward, modular, and atom-efficient method is reported for the synthesis of α-amidoketones from vinyl esters via a cascade reaction including hydroformylation, condensation with a primary amine, and a rearrangement step giving water as the only byproduct. The reaction sequence can be performed in one pot or as a three-step procedure. The synthetic applicability is demonstrated by the preparation of different