The recently reported capability of pentachloro-2-nitrobutadiene and some closely related derivatives to allow the synthesis of highly substituted acyclic as well as five-membered (hetero)cyclic compounds is herein extended to pyrimidines with an exceptional substitution pattern. Our novel approach starts from a 1,1-diamino-3,4,4-trichloro-2-nitrobuta-1,3-diene and an appropriate amidine. Some of the resulting perfunctionalized pyrimidines were subjected to further transformations to give promising candidates with respect to biological, especially pharmacological, activity.