Rearrangements of Cyclobutenones. Synthesis of N-Methyl-7,8-dihydrobenzophenanthridine-9,12-diols and Related Compounds
摘要:
A useful synthetic route to benzophenanthridines and annulated derivatives is reported. These arise from the thermolysis (refluxing chlorobenzene) of squaric acid-derived C(3-N-methyl-N-arylpropynyl)-cyclobutenones via a mechanism which involves an electrocyclic ring opening of the cyclobutenone to the corresponding enynylketenes. Subsequent ring closure to a diradical intermediate followed by radical arylation gives the benzophenanthridines.
Rearrangements of Cyclobutenones. Synthesis of N-Methyl-7,8-dihydrobenzophenanthridine-9,12-diols and Related Compounds
摘要:
A useful synthetic route to benzophenanthridines and annulated derivatives is reported. These arise from the thermolysis (refluxing chlorobenzene) of squaric acid-derived C(3-N-methyl-N-arylpropynyl)-cyclobutenones via a mechanism which involves an electrocyclic ring opening of the cyclobutenone to the corresponding enynylketenes. Subsequent ring closure to a diradical intermediate followed by radical arylation gives the benzophenanthridines.
Rearrangements of Cyclobutenones. Synthesis of <i>N</i>-Methyl-7,8-dihydrobenzophenanthridine-9,12-diols and Related Compounds
作者:Antonio R. Hergueta、Harold W. Moore
DOI:10.1021/jo990505b
日期:1999.8.1
A useful synthetic route to benzophenanthridines and annulated derivatives is reported. These arise from the thermolysis (refluxing chlorobenzene) of squaric acid-derived C(3-N-methyl-N-arylpropynyl)-cyclobutenones via a mechanism which involves an electrocyclic ring opening of the cyclobutenone to the corresponding enynylketenes. Subsequent ring closure to a diradical intermediate followed by radical arylation gives the benzophenanthridines.