Diethyl azodicarboxylate → HCID 15225231, compound

Participants

Reaction Steps

To a solution of the 1,5-dihydro-3-propyl-2H-pyrimido[4,5-b][1,4]benzothiazine-2,4(3H)-dione (0.55 g) in acetonitrile (40 ml) was added dropwise diethylazodicarboxylate (0.52 g) at room temperature. The mixture was stirred for two hours. After the solvent was removed, the residue was triturated with diethylether and filtered to give 3-propyl-2H-pyrimido[4,5-b][1,4]benzothiazine-2,4(3H)-dione (0.43 g, 78% yield).

Provenance & Evidence