Construction of a Pyrimidine Framework through [3 + 2 + 1] Annulation of Amidines, Ketones, and <i>N</i>,<i>N</i>-Dimethylaminoethanol as One Carbon Donor
作者:Zemin Qin、Yongmin Ma、Fanzhu Li
DOI:10.1021/acs.joc.1c01847
日期:2021.10.1
synthesis of pyrimidinederivatives has been developed. It involves a [3 + 2 + 1] three-component annulation of amidines, ketones, and one carbon source. N,N-Dimethylaminoethanol is oxidized through C(sp3)–H activation to provide the carbon donor. One C–C and two C–N bonds are formed during the oxidative annulation process. The reaction shows good tolerance to many important functional groups in air, making
polysubstituted pyrimidines are smoothly formed via a base-promoted intermolecular oxidation C–N bond formation of allylic C(sp3)–H and vinylic C(sp2)–H of allyllic compounds with amidines using O2 as the soleoxidant. This protocol features protecting group free nitrogen sources, good functional group tolerance, high atom economy, and environmental advantages.
Selective synthesis of pyrimidines from cinnamyl alcohols and amidines using the heterogeneous OMS-2 catalyst
作者:Jian Shen、Xu Meng
DOI:10.1016/j.catcom.2019.105846
日期:2020.4
Herein, an efficient aerobic oxidative synthesis of pyrimidines was carried out using cinnamyl alcohols and amidines catalyzed by manganese oxide octahedral molecularsieve (OMS-2). The heterogeneous catalytic method features base-/additive-free conditions, wide substrate scope, use of O2 as a green oxidant, and simple operation. Moreover, the OMS-2 catalyst prepared by the conventional reflux method demonstrates