Oxidative Ring Expansion of Spirocyclic Oxindole Derivatives
作者:Jan Bergman、Carl-Johan Arewång、Per H. Svensson
DOI:10.1021/jo501269f
日期:2014.10.3
3H)dione 8, which was also identified as an intermediate in the oxidation of isamicacid. Mild hydrolysis of 7 gave the 10-membered molecule 22. Isamicacid could easily be converted to N-nitrosoisamic acid, which when heated in ethanol underwent a ring expansion to a hydroximino derivative, 38, of compound 6. The structure of 38 was confirmed by X-ray crystallography.