a Cp*Co(III)(LX)-catalyzed dearomative Diels–Alder dimerization of 2,6-disubstituted phenyl azidoformates. Upon the postulated cobalt-nitrenoid insertion into the neighboring ortho-carbon, the key intermediate of ortho-quinamine was generated for the subsequent dimeric cycloaddition process. A series of experimental and computational studies suggested that the quinolinol ligand of the cobalt catalyst
Temperature variable pyrolyses of 2,6-disubstituted phenyl azidoformates
作者:David G. Hawkins、Otto Meth-Cohn、Salah Rhouati
DOI:10.1039/c39830001254
日期:——
On pyrolysis, 2,6-di-isopropylphenyl azidoformate gives primarily a cyclohexadienone dimer, a benzoxazolone, or a benzoxazinone dependent upon temperature while 2-methyl-4,6-di-t-butylphenyl azidoformate gives 2-isocyanato-2-methyl-4,6-di-t-butylcyclohexa-2,4-dienone at lower temperature but 5-t-butyl-7-methylbenzoxazol-2-one at higher temperature.