Synthesis of 2‐methyl‐3‐oxoindoline‐2‐carboxylates is developed using a bis(trimethylsilyl)aluminum chloride‐induced aza‐Brook rearrangement as a crucial step. Regarding the organoaluminum species, use of readily available tris(trimethylsilyl)aluminum·ether complex was not suitable for the present cyclization. After a series of examination of the reaction conditions, the aza‐Brook rearrangement and
Arylnitrene cyclisations by way of 6-membered spiro intermediates. The formation of carbazoles, acridines, and acridones from aryl 2-azidobenzoates
作者:Michael G. Clancy、Masoud M. Hesabi、Otto Meth–Cohn
DOI:10.1039/c39800001112
日期:——
Aryl2-azidobenzoates undergo vapour-phase pyrolysis to give carbazoles in moderate yield: alternatively, 4-methylacridan and acridone are formed from 2,6-dimethylphenyl and salicyl 2-azidobenzoates respectively, all the products being derived from6-membered spirobenz[1,3]oxazinone intermediates.