Chlorotrimethylsilane → HCID 178438394, compound

Participants

Reaction Steps

5.77 g (0.02 mol) of 4-oxo-2-propyl-4H-pyrido[1,2-a]thieno[2,3-d]-pyrimidine-7-carboxylic acid (Example 3) and 6.49 g (0.04 mol) of 1,1'carbonyldiimidazole (Aldrich Chemical Company) in 100 ml of dimethylformamide are stirred at 50° C. for one hour. To 2.5 g (0.024 mol) of 5-aminotetrazole monohydrate (Aldrich Chemical Company) in 50 ml of dimethylformamide cooled to 0°-5° C. is added 9.14 ml (0.072 mol) of chlorotrimethylsilane (Aldrich Chemical Company) and 10 ml (0.072 mol) of triethylamine. The mixture is stirred and allowed to reach room temperature. After two hours the mixture is combined with the previous imidazolide mixture and stirred for fourteen hours at room temperature. The resulting precipitate 0.9 g, of 4-oxo-2-propyl-N-1H-tetrazol-5-yl-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carboxamide is collected; mp 306°-308° C. (dec) after recrystallization from pyridine.

Provenance & Evidence