Polyfunctional pyridines from nitroacetamidine and β-diketones. A useful synthesis of substituted imidazo [4,5-<i>b</i>] pyridines and related compounds
作者:Douglas G. Batt、Gregory C. Houghton
DOI:10.1002/jhet.5570320349
日期:1995.5
Nitroacetamidine undergoes a useful cyclocondensation with β-diketones to produce substituted 2-amino-3-nitropyridines. Use of an acylpyruvate generates hitherto unreported 2-amino-3-nitropyridine-4-carboxylates. These may be converted easily to functionalized imidazo[4,5-b]pyridines and oxazolo-[5,4-b]pyridines.
硝基乙am与β-二酮进行有效的环缩合反应,生成取代的2-氨基-3-硝基吡啶。酰基丙酮酸酯的使用产生迄今未报道的2-氨基-3-硝基吡啶-4-羧酸酯。这些可以容易地转化为官能化的咪唑并[4,5- b ]吡啶和恶唑-[5,4- b ]吡啶。