1,2,3,4-Tetrahydro-3-methyl-2,4-dioxo5-trimethylsilylethynyl-quinazoline → 4,5-Dihydro-4-methyl-3-(5-methyl-1,2,4-oxadiazol-3-yl)-5-oxo-imidazo(1,5-a)quinazoline

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Reaction Steps

6-ethynyl-4,5-dihydro-4-methyl-3-(5-methyl-1,2,4-oxadiazol-3-yl)-5-oxo-imidazo(1,5-a)quinazoline, M.p. 202-206° C.. by reaction between 5-methyl-3-isocyanomethyl-1,2,4-oxadiazole and 1,2,3,4-tetrahydro-3-methyl-2,4-dioxo-5-trimethylsilylethynyl-quinazoline. Column chromatography(silica gel)ethyl acetate) of the crude product yielded 0.08g (12%) of 4,5-dihydro-4-methyl-3-(5-methyl-1,2,4-oxadiazol-3-yl)-5-oxo-imidazo(1,5-a)quinazoline and 0.Olg (1.9%) of 6-ethynyl-4,5-dihydro-4-methyl-3-(5-methyl-1,2,4-oxadiazol-3-yl)-5-oxo-imidazo(1,5-a)quinazoline.

Provenance & Evidence