Cross-dehydrogenative coupling of ethers and amides with tautomerizable quinazolinones and mechanistic studies

Cross-dehydrogenative coupling reactions have been utilized to alkylate 4(3H)-quinazolinones with ethers and amides, using catalytic n-Bu4NI and t-BuOOH as oxidants. The reactions with amides represent the first examples under such conditions. Studies via inter- and intramolecular competitive experiments with protio and deuterio reactants, as well as radical inhibition experiments, provided mechanistic insight. Also, an understanding of the relative reactivities of ethers was obtained by pairwise competitions with 4(3H)-quinazolinone.

Automated summary

Cross-dehydrogenative coupling reactions were used to alkylate 4(3H)-quinazolinones with ethers and amides, with catalytic n-Bu4NI and t-BuOOH as oxidants. The reactions with amides were the first examples under these conditions. Mechanistic insights were obtained through inter- and intramolecular competitive experiments with protio and deuterio reactants, as well as radical inhibition experiments. Understanding of the relative reactivities of ethers was also achieved through pairwise competitions with 4(3H)-quinazolinone.