作者:E. Rajanarendar、P. Ramesh、E. Kalyan Rao、G. Mohan、A. Siva Rami Reddy
DOI:10.1002/jhet.5570440529
日期:2007.9
Benzimidazoles 3, 6 and 9 have been synthesized selectively in excellent yields by cyclocondensation of β-(3-methyl-5-styryl-4-isoxazolyl amido) benzoic acids, acrylic acids and propionic acids with 1,2-phenylene diamines by employing BF3·Et2O as the catalyst. When the same reaction was carried out in pyridine it resulted in mixture of products in each case (3 & 4, 6 & 7 and 9 & 10). Other methods
苯并咪唑3,6和9已被选择性地以优良产率通过采用BF合成由β-(3-甲基-5-苯乙烯基-4-异恶唑基酰氨基)的环化缩合苯甲酸,丙烯酸和丙酸与1,2-苯二胺3 ·Et 2 O作为催化剂。当相同的反应在吡啶中进行它导致了在每种情况下(产物的混合物3和4,6和7和9和10)。通过使用多磷酸尝试过其他方法,盐酸,TFA也导致的混合物3和4,6和7和9和10在每种情况下,类似于吡啶反应。