反应详情

A mixture of the above product (817 mg) and 27.5% hydrogen bromide/acetic acid (3 ml) is stirred at room temperature for 1.5 hours. The resultant solution is mixed with dry ether (30 ml) to give a precipitate. The precipitate is washed with dry ether (20 ml) twice to give 5-chloro-2-(3-aminomethyl-5-propargyloxymethyl-4H-1,2,4-triazol-4-yl)-benzophenone hydrobromide. To a suspension of this hydrobromide in dry benzene (20 ml), 2-phthalimidoacetyl chloride (1.6 g) is added at room temperature. The resultant mixture is mixed with dry dimethylformamide (10 ml) and stirred at room temperature for 3 hours. The reaction mixture is poured into saturated aqueous sodium bicarbonate (50 ml)/water (50 ml) and stirred under ice-cooling for 30 minutes. The precipitate is filtered, washed with water and ether in order and dissolved in methylene chloride (about 50 ml). The organic layer is dried over magnesium sulfate and evaporated to remove the solvent. The residue is recrystallized from methylene chloride/ethanol to give 5-chloro-2-[3-(2-phthalimidoacetamidomethyl)-5-propargyloxymethyl-4H-1,2,4-triazol-4-yl]-benzophenone (682 mg) as crystals melting at 245° to 246° C. (decomp.). (4) A solution of the above product (600 mg) and hydrazine hydrate (1.0 ml) in 95% ethanol (10 ml) is refluxed for 2 hours. The precipitate is filtered off, and the filtrate is evaporated under reduced pressure to remove the solvent. The residue is extracted with methylene chloride, and the methylene chloride layer is shaken with 2N hydrochloric acid (50 ml) twice. The hydrochloric acid layer is made alkaline with aqueous ammonia and shaken with methylene chloride thrice. The methylene chloride layer is dried over potassium carbonate to give 5-chloro-2-(3-glycylaminomethyl-5-propargyloxymethyl-4H-1,2,4-triazol-4-yl)-benzophenone hydrate as a colorless oil. The product is crystallized from isopropanol/ether to give crystals melting at 93° to 95° C.

1. additionis added at room temperature
2. stirringstirred under ice-
3. temperaturecooling for 30 minutes
4. filtrationThe precipitate is filtered
5. washwashed with water and ether in order
6. dissolutiondissolved in methylene chloride (about 50 ml)
7. dry with materialThe organic layer is dried over magnesium sulfate
8. customevaporated
9. customto remove the solvent
10. customThe residue is recrystallized from methylene chloride/ethanol