Synthesis 2021; 53(08): 1471-1477
DOI: 10.1055/s-0040-1705975
paper

Peroxide-Mediated Oxidative Radical Cyclization to the Quinazolinone System: Efficient Syntheses of Deoxyvasicinone, Mackinazolinone and (±)-Leucomidine C

Jazmín García-Ramírez
,
Financial support from Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica-Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México (PAPIIT­-DGAPA) (Project IN208719) is gratefully acknowledged. JG-R thanks the Consejo Nacional de Ciencia y Tecnología (CONACYT) for a Ph.D. scholarship (No. 577203).


Abstract

An efficient protocol for obtaining fused quinazolinones through an oxidative free-radical cyclization under metal- and tin-free conditions is described. The oxidative cyclization of various N-3-ω-iodoalkyl derivatives to provide tricyclic systems using dicumyl peroxide as the sole reagent is studied. The method then is employed for the syntheses of 5-, 6-, and 7-membered fused quinazolinone analogues, including the natural products deoxyvasicinone and mackinazolinone. A xanthate-based oxidative radical cascade addition/cyclization process that allows the production of new menthol- and testosterone-quinazolinone conjugates, as well as the first total synthesis of leucomidine C, are also reported.

Supporting Information



Publication History

Received: 28 August 2020

Accepted after revision: 15 October 2020

Article published online:
19 November 2020

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