tert-Butyl 3-(7-amino-2H-benzo[b][1,4]thiazin-4(3H)-yl)pyrrolidine-1-carboxylate → HCID 178452061, compound

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Reaction Steps

Methyl thiophene-2-carbimidothioate hydroiodide (0.53 g, 1.874 mmol) was added to a mixture of tert-butyl 3-(7-amino-2H-benzo[b][1,4]thiazin-4(3H)-yl)pyrrolidine-1-carboxylate (0.31 g, 0.937 mmol) in EtOH (20 mL). The mixture was stirred under room temperature overnight. The mixture was quenched with saturated sodium bicarbonate solution (50 mL). The solution was then transferred to a separatory funnel, diluted with water (50 mL), and extracted with CH2Cl2 (2×50 mL). The crude material was subjected to flash chromatography on silica gel (50-90% EtOAc/hexanes). The concentrated fractions afforded a yellow oil (0.29 g, 69%). 1H NMR (CDCl3) δ 7.41 (dd, J=0.9, 5.1 Hz, 1H), 7.38 (d, J=3.6 Hz, 1H), 7.06 (dd, J=3.9, 4.9 Hz, 1H), 6.79-6.76 (m, 2H), 6.68-6.66 (m, 1H), 4.84 (brs, 2H), 4.35-4.23 (m, 1H), 3.74-3.22 (m, 6H), 3.12-3.07 (m, 2H), 2.19-1.99 (m, 2H), 1.47 (s, 9H); ESI-MS (m/z, %): 447, 445 (MH+, 100).

Provenance & Evidence