Chlorotrimethylsilane → HCID 178435418, compound

Participants

Reaction Steps

0.64 g (0.0023 mol) of 2-ethyl-4-oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carboxylic acid (Example 2) and 0.75 g (0.0046 mol) of 1,1'carbonyldiimidazole (Aldrich Chemical Company) in 70 ml of dimethylformamide are stirred at 70° C. for two and one-half hours. To 0.31 g (0.003 mol) of 5 -aminotetrazole monohydrate (Aldrich Chemical Company) in 40 ml of dimethylformamide cooled to 0°-5° C. is added 1.5 ml (0.012 mol) of chlorotrimethylsilane (Aldrich Chemical Company) and 2.5 ml (0.018 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 is collected, slurried in boiling glacial acetic acid, the mixture is cooled and filtered to give 0.58 g of 2-ethyl-4-oxo-N-1H-tetrazol-5-yl-4H-pyrido[1,2-a]thieno[2,3 -d]pyrimidine-7-carboxamide; mp 310°-312° C. (dec).

Provenance & Evidence