Chlorotrimethylsilane → HCID 178422238, compound

Participants

Reaction Steps

1.86 g (0.00715 mol) of 2-methyl-4-oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carboxylic acid (Example 1) and 1.62 g (0.01 mol) of 1,1'carbonyldiimidazole (Aldrich Chemical Company) in 210 ml of dimethylformamide are stirred at 50° C. for sixteen hours. To 0.83 g (0.008 mol) of 5-aminotetrazole monohydrate (Aldrich Chemical Company) in 50 ml of dimethylformamide cooled to 0°-5° C. is added 3.0 ml (0.024 mol) of chlorotrimethylsilane (Aldrich Chemical Company) and 6.0 ml (0.043 mol) of triethylamine. After thirty minutes the mixture is allowed to reach room temperature and is stirred for an additional two hours. This mixture is combined with the previous cooled imidazolide mixture and stirred for three days at room temperature. The resulting precipitate is collected, slurried in boiling glacial acetic acid, the mixture is cooled and filtered to give 0.69 g of 2-methyl-4-oxo-N-1H-tetrazol-5-yl-4H-pyrido[1,2 -a]thieno[2,3-d]pyrimidine-7-carboxamide; mp 306°-310° C. (dec).

Provenance & Evidence