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DOI: 10.1055/s-0043-1774842
Synthesis of Tetracyclic Benzazole–Condensed Quinazolinones through Triphenylbismuth Dichloride Assisted Cyclodesulfurization
This work was supported by the Institute of Pharmaceutical Life Sciences, Aichi Gakuin University.
Abstract
Benzazole-condensed quinazolinones, such as benzo[4,5]imidazo[2,1-b]- and benzo[4,5]oxazolo[2,3-b]quinazolinones are of a great interest because of their potential applications as biologically active substances. Herein, we report that the treatment of various o-phenylenediamines with methyl 2-isothiocyanatobenzoate afforded thioxoquinazolinones, which were reacted in situ with triphenylbismuth dichloride in the presence of K2CO3 to give the desired benzimidazoquinazolinones in good to excellent yields under mild conditions. Triphenylbismuth dichloride promoted the conversion of thioxoquinazolinone to tetracyclic products as an efficient cyclodesulfurization reagent. All the steps in this tandem reaction were performed at room temperature. The present reaction system can also be applied to benzoxazoloquinazolinone synthesis by using 2-aminophenols as the starting material.
Key words
benzimidazoquinazolinone - triphenylbismuth dichloride - cyclodesulfurization - one-pot tandem reaction - aminophenolSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0043-1774842.
- Supporting Information
Publication History
Received: 03 April 2024
Accepted after revision: 10 May 2024
Article published online:
27 May 2024
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