COUTTS I. G. C.; HAMBLIN M., J. CHEM. SOC. CHEM. COMMUNS <CCOM-A8>, 1976, NO 2, 58-59
作者:COUTTS I. G. C.、 HAMBLIN M.
DOI:——
日期:——
Spirodienones. Part 2. The synthesis of some heterocyclic spirodienones by phenolic coupling
作者:Ian G. C. Coutts、Michael R. Hamblin、Sheila E. Welsby
DOI:10.1039/p19810000493
日期:——
and of p-fluoranil. Attempted ether formation with 2,6-di-t-butyl-4-bromophenol and either 2- or 3-methoxyphenol failed, small quantities of unsymmetric biphenyls being formed in a novel arylation reaction. A spirobenzoxazole can be prepared by oxidation of a 2,4′-dihydroxydiphenylamine. Substituent effects in the hydrolysis of derived spirodienols have been observed.
Spirodienones part 81. The direct preparation of spirodioxole — and spirobenzoxazole - cyclohexadienones by the oxidation of 4 - aryloxyanilines
作者:Ian G.C. Coutts、Vasilios H. Pavlidis、Khalid Reza、Mark R. Southcott、Gregory Wiley
DOI:10.1016/s0040-4039(97)01244-6
日期:1997.8
Oxidation of 4(2 - hydroxyphenoxy)anilines 1b to 1d with active manganese dioxide leads directly to quinone mono - ketals 2b to 2d in reasonable yield. Similar reaction of 4 (2 - sulfonamidophenoxy)anilines 9a, 9b provides an efficient synthesis of spirobenzoxazolecyclohexadienones 10a and 10b but treatment with manganese dioxide of alcohol 3 and oxime 6 gives respectively azobenzene 4 and terphenyl