Potassium Iodide → 7-Nitro-4-(3-(pyrrolidin-1-yl)propyl)-3,4-dihydro-2H-benzo[b][1,4]thiazine

Participants

Reaction Conditions

Reaction Steps

A solution of 4-(3-chloropropyl)-7-nitro-3,4-dihydro-2H-benzo[b][1,4]thiazine (0.54 g, 1.980 mmol) in dry acetonitrile (20 mL) was treated with pyrrolidine (1.637 mL, 19.80 mmol), potassium carbonate (2.74 g, 19.80 mmol), and potassium iodide (0.657 g, 3.96 mmol) at room temperature. The resulting mixture was stirred at 60° C. overnight (18 hours). The reaction was brought to room temperature and diluted with water (50 mL), and the product was extracted into ethyl acetate (2×25 mL). The combined ethyl acetate layers were washed with brine (20 mL) and then dried (Na2SO4). The solvent was evaporated, and the crude material was purified by flash column chromatography (5:95 (2 M NH3 in MeOH):CH2Cl2) to obtain the title product (0.57 g, 94%) as a syrup. 1H NMR (DMSO-d6) δ 7.84-7.80 (m, 2H), 6.87 (d, 1H, J=9.6 Hz), 3.79-3.75 (m, 2H), 3.49 (t, 2H, J=6.9 Hz), 3.08-3.05 (m, 2H), 2.44-2.40 (m, 6H), 1.76-1.69 (m, 6H); ESI-MS (m/z, %): 308 (MH+, 100).

Provenance & Evidence