Substituted oxazole benzenesulfonamides as potent human β3 adrenergic receptor agonists
摘要:
As a part of our investigation into the development of orally bioavailable beta(3) adrenergic receptor agonists, we have identified a series of substituted oxazole derivatives that are potent beta(3) agonists with excellent selectivity against other beta receptors. Several of these compounds showed excellent oral bioavailability in dogs. One example, cyclopentylethyloxazole 5f is a potent beta(3) agonist (EC50 = 14 nM, 84% activation) with 340-fold and 160-fold selectivity over beta(1) and beta(2) receptors, respectively, and has 38% oral bioavailability in dogs. (C) 2000 Elsevier Science Ltd. All rights reserved.
A palladium‐catalyzed tandem reaction of cyanomethyl benzoates with arylboronic acids has been achieved. Substitution at the 2‐position of cyanomethyl benzoates was found to be crucial for the selective synthesis of oxazoles and isocoumarins. Cyanomethyl benzoates afforded 2,4‐diaryloxazoles as products, while 2‐benzoyl‐substituted cyanomethyl benzoates delivered 3‐benzoyl‐4‐aryl‐isocoumarins selectively
Radical cascade synthesis of azoles <i>via</i> tandem hydrogen atom transfer
作者:Andrew D. Chen、James H. Herbort、Ethan A. Wappes、Kohki M. Nakafuku、Darsheed N. Mustafa、David A. Nagib
DOI:10.1039/c9sc06239d
日期:——
A radical cascade enables rapid, modular access to five-membered heteroarenes, including oxazoles and imidazoles, through a regio- and chemo-selective β C–H bis-functionalization.
A novel synthetic method for the preparation of 2,4-disubstituted oxazoles was developed, entailing the reaction of dibutyltin diacylates Bu2Sn[OC(O)R](2) with 1-substituted acetylenes and TMSN3 to afford a range of 2,4-disubstituted oxazoles in good yields. (C) 2020 Elsevier Ltd. All rights reserved.