反应详情

In a 250 mL round-bottomed flask, 5-ethyl-2-nitro-4,5,6,7-tetrahydro -pyrazolo[1,5-a]pyrazine (427 mg, 2.17 mmol, Eq: 1.00) was combined with EtOH (50 ml) to give a light yellow suspension. The reaction mixture was vacuum flushed three times with argon then 10% Pd/C (115 mg, 1.08 mmol, Eq: 0.5) was added and the reaction mixture was stirred under hydrogen balloon overnight. The reaction was filtered through a pad of celite. The celite pad was washed with ethanol. The combined filtrate and washes were concentrated in vacuo to afford the desired product (350 mg). (M+H)+=167 m/e. 1H NMR (300 MHz, CHLOROFORM-d) δ ppm 1.16 (t, J=7.18 Hz, 3 H) 2.59 (q, J=7.18 Hz, 2 H) 2.79-3.03 (m, 2 H) 3.57 (overlapping s, 4 H) 3.87-4.12 (m, 2 H) 5.35 (s, 1 H).

1. customto give a light yellow suspension
2. customflushed three times with argon
3. filtrationThe reaction was filtered through a pad of celite
4. washThe celite pad was washed with ethanol
5. concentrationThe combined filtrate and washes were concentrated in vacuo