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Abstract Several Me substituted imidazo[1.2-b]pyridazines have been synthesized and NMR data for some of them are included and discussed. Homolytic methylation of imidazo[1.2-b]pyridazine revealed a… (More)
Cathepsin D was inactivated with various diazo compounds at very high concentration. Reaction proceeded maximally at pH 4.5 in the presence of cupric ions. With 3-diazo-indazole and triazene the… (More)
The structure of ergothioneine was studied from the dependence of ultraviolet spectra on pH and H0. This and the correlation with some model compounds strongly suggests that ergothioneine exists in… (More)
Transformations of some heterocyclic cyanoamino compounds leading to various heterocyclic systems are described.s-Triazolo (1,5-α)azines are obtained either in a direct synthetic approach or via the… (More)
A new synthetic approach for pyrido[2,3-d]pyrimidine 3-oxides and other pyrido[2,3-d]pyrimidines has been developed. This bicyclic system readily undergoes ring opening to give a variety of products,… (More)