The vicarious nucleophilic substitution of hydrogen and related reactions in nitrobenzoxazoles
作者:Mieczysław Ma̧kosza、Jacek Stalewski
DOI:10.1016/0040-4020(95)00351-8
日期:1995.6
6-nitrobenzoxazoles 3 and 4 react with nucleophiles exclusively at C-2, giving ring opening products. If position 2- is blocked with phenyl substituent the reaction takes place in the carbocyclic ring affording the VNS products. 2-Methylthio-5-nitrobenzoxazole 7 and its 6-nitro isomer 8 give products which result from addition of a nucleophile to the carbocyclic ring (VNS) as well as to the heterocyclic ring
5-和6-硝基苯并恶唑3和4仅在C-2处与亲核试剂反应,产生开环产物。如果2-位被苯基取代基封闭,则反应在碳环中发生,得到VNS产物。2-甲硫基-5-硝基苯并恶唑7及其-6-硝基异构体从添加的亲核试剂到碳环(VNS)的以及与杂环(S其导致8得到产物Ñ Ar和环切割)。2-甲基硫代苯并恶唑可以通过氧化水解容易地转化为相应的苯并恶唑酮。