Rapid palladium-catalyzed cross-coupling in the synthesis of aryl thioethers under microwave conditions
作者:Lisheng Cai、Jessica Cuevas、Yi-Yuan Peng、Victor W. Pike
DOI:10.1016/j.tetlet.2006.04.049
日期:2006.6
A Pd-catalyzed coupling of aromatic iodides or bromides and tin-thiolates under microwave conditions was developed to synthesize aromatic thioethers without concomitant formation of the reduced products. Ligand screening revealed DiPPF and BINAP-Tol as the most generally useful ligands for this transformation. A variety of iodides or bromides were coupled to give the thioethers rapidly (10 min) in 60-95% isolated yield. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis and Structure−Affinity Relationships of New 4-(6-Iodo-<i>H</i>-imidazo[1,2-<i>a</i>]pyridin-2-yl)-<i>N</i>-dimethylbenzeneamine Derivatives as Ligands for Human β-Amyloid Plaques
作者:Lisheng Cai、Jessica Cuevas、Sebastian Temme、Mary M. Herman、Claudio Dagostin、David A. Widdowson、Robert B. Innis、Victor W. Pike
DOI:10.1021/jm0702231
日期:2007.9.1
extensive set of 4-(6-iodo-H-imidazo[1,2-a]pyridin-2-yl)-N-dimethylbenzeneamine (IMPY) derivatives was synthesized and assayed for affinity toward human Abeta plaques. 6-Ethylthio- (12h), 6-cyano- (12e), 6-nitro- (12f), and 6-p-methoxybenzylthio- (15d) analogues were discovered to have high affinity (KI < 10 nM). However, introduction of a hydrophilic thioether group in the 6-position (15a-c, 15e-g) reduced