σ-Complexes in the Pyrimidine Series. 14. Dihydropyrimidine Analogs of Acyclonucleosides. Synthesis of 2,3-Dihydroxypropyl Derivatives of 4-Aryl-6-methyl-5-nitro-1,4(3,4)-dihydropyrimidin-2-ones

Methods have been developed for the synthesis of 5-nitro-1,4- and 5-nitro-3,4-dihydropyrimidin-2-one analogs of acyclonucleosides containing a 2,3-dihydroxypropyl fragment in positions 1 and 3 respectively of the dihydropyrimidine ring.