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 isamic acid. Mild hydrolysis of 7 gave the 10-membered molecule 22. Isamic acid 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.
螺环的羟吲哚衍生物,异氰酸1的氧化导致脱羧和环膨胀为quinazolino [4,5 - b ] quinazoline-6,8-dione 7,而不是以前认为的异构体6。X射线晶体学证实了7的结构。靛红(吲哚-2,3-二酮)和2-氨基苯甲酰胺的缩合形成螺环分子,螺[3 H-吲哚-3,2'(1 H)喹唑啉] -2,4'(1 H,3 H)二酮8,它也被认为是异酰胺酸氧化的中间体。7的轻度水解得到10元分子22。异羟肟酸很容易转化为N-亚硝基异羟肟酸,当在乙醇中加热时,它会扩环成化合物6的氢氧氨基衍生物38。通过X射线晶体学确认了38的结构。