Acetic Acid → HCID 13338632, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 3 parts of 3,4-dihydro-2-H-pyrimido[2,1-b]benzothiazol-7-amine in 16 parts of acetic acid are added 32 parts of water. Then there is added dropwise a solution of 1.46 parts of potassium cyanate in 32 parts of water (slightly exothermic reaction). Upon completion, stirring is continued overnight at room temperature. The reaction mixture is alkalized with ammonium hydroxide and the whole is stirred while cooling at 10° C. The precipitated product is filtered off and crystallized twice: first from 2-methoxyethanol and then from 1-butanol, yielding 0.6 parts of N-(3,4-dihydro-2H-pyrimido[2,1-b]benzothiazol-7-yl)urea; mp. 245.9° C.

Provenance & Evidence