Abstract
A highly efficient one-pot approach for the synthesis of carbonyl 2-amino-pyrimidines from 1,3-diynes and guanidine in the presence of Cs2CO3 and DMSO has been described. In these reactions, 1,3-diynes act as a precursor of buta-1,2,3-trienes and guanidine serves as the N–CN source for the construction of pyrimidines. This methodology proves to be a tandem regioselective heterocyclization of 1,3-diynes with guanidine and selective oxidation with DMSO.
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