Traceless solid phase synthesis of 2-substituted pyrimidines using an ‘off-the-shelf’ chlorogermane-functionalised resin
作者:Alan C. Spivey、Ratnasothy Srikaran、Christopher M. Diaper、David J. Turner
DOI:10.1039/b303064d
日期:——
The parallel solid phase synthesis of an 18-member library of 2-substituted pyrimidines is described using a chlorogermane-functionalised resin. The success of the key Pinner-type condensations between a resin-bound enaminone and an array of amidine hydrochlorides highlights the stability of arylgermane linkers (cf. arylsilanes) towards strongly basic/nucleophilic conditions.
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.