反应详情

At RT, Pd/C (1.262 g of 10% wt., 10.65 mmol) was added to a solution of 3-methyl-1-(methylsulfonyl)-3-nitrobutane (338a, 2.08 g, 10.65 mmol) in EtOH (53.3 mL) and DCM (53.3 mL). The reaction mixture was placed under hydrogen (46 psi) in a carbonate jacketed reaction vessel at RT for 16 h when the pressure had reduced to ambient pressure. The reaction vessel was pressurized again to 50 psi hydrogen for 3 d when the pressure had reduced to 40 psi. The mixture was filtered through a pad of Celite, covered with sand, and washed with DCM then MeOH. The filtrate was distilled to first remove the DCM and MeOH before a white solid was observed; this was filtered, washed with DCM, and dried in vacuo to give 2-methyl-4-(methylsulfonyl)butan-2-amine (338b, 1.62 g, 9.80 mmol, 92% yield) as a crystalline white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.27 (s, 6H) 2.00 (d, J=17.21 Hz, 1H) 2.00 (t, J=4.11 Hz, 1H) 3.02 (s, 3H) 3.29 (d, J=17.21 Hz, 1H) 3.29 (t, J=4.50 Hz, 1H) 8.20 (br. s., 2H). MS (ESI, pos. ion) m/z: 166.2 (M+1).

1. customreaction vessel at RT for 16 h when the pressure
2. filtrationThe mixture was filtered through a pad of Celite
3. washwashed with DCM
4. distillationThe filtrate was distilled
5. customto first remove the DCM and MeOH before a white solid
6. filtrationthis was filtered
7. washwashed with DCM
8. customdried in vacuo