Cyanide as a powerful catalyst for facile synthesis of benzofused heteroaromatic compounds via aerobic oxidation
作者:Yeon-Ho Cho、Chun-Young Lee、Cheol-Hong Cheon
DOI:10.1016/j.tet.2013.05.138
日期:2013.8
Highly efficient synthesis of benzofused heteroaromatic compounds via aerobic oxidation catalyzed by cyanide anion has been developed. The Schiff bases derived from 2-aminophenol and aldehydes provided the corresponding benzoxazoles in high yields in the presence of a catalytic amount of cyanide in an open flask under ambient conditions without the use of any external metal co-oxidants and bases. Furthermore
已经开发了通过氰化物阴离子催化的需氧氧化高效合成苯并稠合杂芳族化合物的方法。衍生自2-氨基苯酚和醛的席夫碱在敞口烧瓶中,在环境条件下,不使用任何外部金属助氧化剂和碱的情况下,在催化量氰化物的存在下,以高收率提供了相应的苯并恶唑。此外,我们已经开发了一种催化顺序一步法,用于合成苯并恶唑,方法是将催化量的NaCN添加到由2-氨基苯酚和醛原位生成的席夫碱中,而无需分离亚胺中间体。该一锅法方案进一步扩展为由2-氨基硫酚和醛合成苯并噻唑。