反应详情

A reaction mixture containing Compound 1 (880 mg, 4.02 mmol), EDCl (1.16 g,6.04 mmol), HOBt (816 mg,6.04 mmol), DIPEA (2.8 mL, 16.08 mmol), ammonium chloride (430 mg, 8.04 mmol) in anhydrous DMF 16 mL (4 mL DMF/1 mmol) was stirred at rt for 5 hours. The reaction was diluted with water and extracted with EtOAc (3×10 mL). The combined EtOAc extracts were washed with saturated NaHCO3 (2×10 mL), water, dried (MgSO4), filtered, and the solvent concentrated in vacuo till a minimum volume of EtOAc remained. Upon cooling, the desired primary amide crystallized out as a white crystalline solid, in 64% yield. mp=146-148° C. t is noted that Shaw, “The Synthesis of Tryptamines Related to Seratonin”, Vol. 77, J. Amer. Chem. Soc., pp. 4319-4324 (1955) reported the mp=147-150° C. 1H NMR (DMSO-d6) δ 10.56 (s, 1 H, NH), 7.34 (bs, 1 H, CONH), 6.96-7.22 (m, 1 H, ArH), 6.81 (s, 1 H, ArH), 6.74 (bs, 1 H, CONH), 6.58-6.62 (m, 1 H, ArH), 3.78 (s, 3 H, CH3), 3.34 (s, 2 H, CH2), 2.29 (s, 3 H, CH3). ESI-CID 219 (MH+), m/z 187, 174, 148.

1. extractionextracted with EtOAc (3×10 mL)
2. washThe combined EtOAc extracts were washed with saturated NaHCO3 (2×10 mL), water
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. concentrationthe solvent concentrated in vacuo till a minimum volume of EtOAc
6. temperatureUpon cooling
7. customthe desired primary amide crystallized out as a white crystalline solid, in 64% yield
8. customThe Synthesis of Tryptamines