In water multicomponent synthesis of low-molecular-mass 4,7-dihydrotetrazolo[1,5-]pyrimidines.

The three-component reaction of 5-aminotetrazole with aliphatic aldehydes (formaldehyde, acetaldehyde) and acetoacetic ester derivatives in water under microwave irradiation leads to the selective formation of 4,7-dihydrotetrazolo[1,5-]pyrimidine derivatives. Under similar conditions using 4,4,4-trifluoroacetoacetic ester 5-hydroxy-4,5,6,7-tetrahydrotetrazolo[1,5-]pyrimidines are obtained. The analogous reaction with acetylacetone requires scandium(III) triflate as catalyst.