Carbonylation reaction is a very effective transformation for the synthesis of esters, amides, and heterocyclic compounds. Heterogeneous catalyzed carbonylation reactions can be carried out using the association of Pd/C and microwave dielectric heating. Alkoxy carbonylation can be performed with stoichiometric amounts of different primary and secondary alcohols in DMF in the presence of DBU as the base. Analogously, iodobenzene, CO, and amines can be transformed into the corresponding amides in good yields after a simple filtration to remove the catalyst. Pd/C was also successfully employed in microwave-assisted cyclocarbonylation of o-iodoaniline with acyl chlorides to give benzoxazinones, Pd/C can be recycled two times without a considerable difference in the reaction yields.
Construction of Benzoxazinones from Anilines and Their Derivatives
作者:Teng-Fei Zhao、Xiao-Li Xu、Wei-Yin Sun、Yi Lu
DOI:10.1021/acs.orglett.3c01511
日期:2023.7.14
Herein we report a strategy concerning Rh(III)-catalyzed direct ortho-C–H bond carbonylation to construct benzoxazinones fromanilines and their derivatives with high atom economy. Interestingly, the corresponding amides were generated in situ fromanilines when excess Ac2O was added and directed the following C–H bond carbonylation to form benzoxazinones. Extensive functional group tolerance can be