1,1'-Carbonyldiimidazole → HCID 178522704, compound

Participants

Reaction Steps

In a manner similar to Example 4, 1.4 g. of 3-carboxy-7-chloro-4-oxo-4H-pyrimido[2,1-b]benzothiazole is reacted with 892 mg. of 1,1'-carbonyldiimidazole in 60 ml. of dimethylformamide at steam bath temperatures for 15 min. 5-Aminotetrazole (468 mg.) is added and the reaction mixture is heated for 30 min. The resulting suspension is cooled and filtered, 1.5 g., m.p. > 300° C.

Provenance & Evidence