تفاعل #3634

معادلة التفاعل

4-nitrobenzoyl chloride

5,10-dihydro-4H-pyrazolo[5,1-c][1,4]benzodiazepine

triethylamine

→

desired product

5,10-Dihydro-5-(4-nitrobenzoyl)-4H-pyrazolo-[5,1-c][1,4]benzodiazepine

المذيبات

methylene chloride

ethyl acetate

methylene chloride

ظروف التفاعل

المعالجة

1. 1
   أخرىfollowed by ice bath
2. 2
   درجة الحرارةcooling
3. 3
   workup.ADDITIONaddition
4. 4
   أخرىthe ice bath is removed
5. 5
   أخرىThe volatiles are removed in vacuo
6. 6
   أخرىto give a residue which
7. 7
   غسيلThe solution is washed with water, NaHCO3, and brine
8. 8
   أخرىThe reaction mixture is dried with Na2 SO4
9. 9
   ترشيحfiltered
10. 10
    أخرىevaporated in vacuo
11. 11
    أخرىto give a solid which
12. 12
    أخرىis purified by flash chromatography on silica gel

الإجراء التجريبي

To a solution of 10 mmol of 5,10-dihydro-4H-pyrazolo[5,1-c][1,4]benzodiazepine in 50 ml of methylene chloride under argon is added 15 mmol of triethylamine followed by ice bath cooling. A solution of 11 mmol of 4-nitrobenzoyl chloride in 10 ml of methylene chloride is added dropwise. Following complete addition, the ice bath is removed and the reaction mixture stirred at room temperature for 2 hours. The volatiles are removed in vacuo to give a residue which is dissolved in ethyl acetate. The solution is washed with water, NaHCO3, and brine. The reaction mixture is dried with Na2 SO4, filtered and evaporated in vacuo to give a solid which is purified by flash chromatography on silica gel to give desired product as a solid, m.p. 227°-229° C.

المصدر