Synthesis of novel uracil based 2,5-diaminofurans using multi-component reactions

A simple synthesis of highly functionalized 2,5-diaminofurans based pyrimidine derivatives from 1-(carboxymethyl)uracil via a multi-component reaction is described. The reactive 1:1 intermediate produced from the reaction of tert-butyl isocyanide and dialkyl acetylenedicarboxylates was trapped at room temperature by 1-(carboxymethyl)uracil derivatives to yield polyfunctionalized furan rings in fairly good yields.