反应详情

温度

-20 °C

A round bottomed flask was charged with 5 g (33.5 mmol) of 2-isonitrosoacetophenone, 6.7 g (36.8 mmol) of 2-amino-3-phenylpropanenitrile hydrochloride and 100 mL of dry pyridine. The mixture was cooled to −20° C. and 4.6 mL (40.0 mmol) of TiCl4 was added dropwise. The reaction was kept at −20° C. for 30 min and heated to 80° C. for 2.5 hrs. The solvent was evaporated, and the residue taken up in 1 L of DCM. This solution was washed with saturated NaHCO3 and brine. All volatiles were evaporated, and the residue redissolved in ethanol (400 mL). Raney Ni (2.0 g, aqueous suspension) was added, and the reaction allowed to stir for 5 days under 1 atm of hydrogen. The mixture was passed through celite, and volatiles removed. The residue was chromatographed on silica gel (heptanes/DCM) to give 2.5 g (29%) of 2-amino-3-benzyl-5-phenylpyrazine.

1. temperatureheated to 80° C. for 2.5 hrs
2. customThe solvent was evaporated
3. washThis solution was washed with saturated NaHCO3 and brine
4. customAll volatiles were evaporated
5. dissolutionthe residue redissolved in ethanol (400 mL)
6. additionRaney Ni (2.0 g, aqueous suspension) was added
7. customremoved
8. customThe residue was chromatographed on silica gel (heptanes/DCM)