A compound of the formula (I): ##STR1## or a pharmaceutically acceptable salt thereof is disclosed, as well as processes for and intermediates in the preparation thereof, and a method of antagonizing endothelin.
Eco-friendly polyethylene glycol promoted Michael addition reactions of α,β-unsaturated carbonyl compounds
作者:Dalip Kumar、Gautam Patel、Braja G. Mishra、Rajender S. Varma
DOI:10.1016/j.tetlet.2008.09.116
日期:2008.12
Intra- and inter-nucleophilic addition reactions of different α,β-unsaturatedcarbonylcompounds were found to be highly effective without any additives in PEG-400 as a recyclable reaction medium under neutral conditions.
Highly efficient solvent-free aza-Michael additions of a variety of amines to α,β-unsaturated carbonyl compounds under microwave-irradiation conditions catalyzed by perchloricacid impregnated on silica gel (HClO4/SiO2) is reported. The reactions are completed within 2–7 min in a microwave oven to produce the corresponding adducts in excellent yields, and the catalyst can be recovered and reused.
Microwave-Induced Aza-Michael Reaction in Water: A Remarkably Simple Procedure
作者:Andrea Kall、Debasish Bandyopadhyay、Bimal K. Banik
DOI:10.1080/00397910903134634
日期:2010.5.19
Microwave-induced fast addition of several amines to conjugated carbonyl compounds has been carried out in water very efficiently in the absence of any catalyst.
在没有任何催化剂的情况下,微波诱导的几种胺向共轭羰基化合物的快速添加已在水中非常有效地进行。
Ultrasound-assisted aza-Michael reaction in water: A green procedure
作者:Debasish Bandyopadhyay、Sanghamitra Mukherjee、Luis C. Turrubiartes、Bimal K. Banik
DOI:10.1016/j.ultsonch.2011.11.009
日期:2012.7
The conjugate addition of amines to conjugated alkenes (commonly known as aza-Michael reaction) constitutes a key step for the synthesis of various complex natural products, antibiotics, α-amino alcohols and chiral auxiliaries. Ultrasound-induced addition of several amines to α, β-unsaturatedketones, esters and nitriles has been carried out very efficiently in water as well as under solvent-free conditions