使用温和的环脱水/芳香化反应,通过使用三氟甲磺酸酐(Tf 2 O)和2-甲氧基吡啶(2-MeOPyr)引发,可以中等至极好的收率合成咪唑并[1,5- a ]嗪。发现各种取代模式和官能团在优化条件下是相容的。此外,还显示了5-溴-3-芳基衍生物在Sonogashira交叉偶联和直接芳基化反应中具有活性。叔酰胺与底物相容,可合成三氟甲磺酸咪唑并[1,5- a ]吡啶鎓。
A novel approach for the synthesis of imidazo and triazolopyridines from dithioesters
作者:Ajjahalli B. Ramesha、Nagarakere C. Sandhya、Chottanahalli S. Pavan Kumar、Mahanthawamy Hiremath、Kempegowda Mantelingu、Kanchugarakoppal S. Rangappa
DOI:10.1039/c6nj01038e
日期:——
Various imidazo- and triazolo-pyridines were synthesised by the intramolecular cyclization of pyridine 2-methylamine and dithioesters under mild conditions.