J. S. Sandhu

Studies on uracils: A facile one-pot synthesis of pyrazolo[3,4-d]pyrimidines

The reaction of 6-hydrazino uracils 1 and nitrones 2 result in an efficient one-pot synthesis of pyrazolo[3,4-d]pyrimidines 3 in excellent yields. The isolation of the by-product aniline from the reaction mixture supported the plausible mechanism for the formation of pyrazolo[3,4-d]pyrimidines.

Reaction of benzofurazan N-oxide with buta-1,3-dienylamines. Synthesis of a novel class of quinoxaline NN′-dioxide enamines

Dienamines react with benzofurazan oxide to give a novel class of quinoxaline NN′-dioxide enamines.

Arylidenemalononitriles in heterocyclic syntheses: a novel synthesis of pyrido[2,3-d]pyrimidines

Arylidenemalononitriles react with 6-amino and 6-hydroxyamino-1,3-dimethyl- and 3-methyl-pyrimidine-2,4(1H,3H)-dione to give pyrido[2,3-d]pyrimidines in good yields.

Synthesis of a novel class of pyrazolobenzofuranzan N-oxides: reaction of nitrobenzofurazan N-oxides with diazoacetates

The diazoacetates (2a,b) and nitrobenzofurazan N-oxides (1) react to give the pyrazolobenzofurazan N-oxides (3a,b) in good yields.