1,8-Diazabicyclo(5.4.0)undec-7-ene → 2-(5-Cyclopropyl-[1,2,3]triazol-1-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-8-carboxylic acid amide

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To a suspension of 8-bromo-2-(5-cyclopropyl-[1,2,3]triazol-1-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene (224 mg, 0.58 mmol), hydroxylamine hydrochloride (81 mg, 1.16 mmol), molybdenum hexacarbonyl (77 mg, 0.29 mmol), tri-tert-butylphosphine tetrafluoroborate (17 mg, 0.058 mmol), trans-di-μ-acetatobis[2-(di-o-tolylphosphino)benzyl]dipalladium(II) (27 mg, 0.029 mmol) in dioxane (7 mL) were added 1,8-diazabicyclo[5.4.0]undec-7-ene (86 μL, 0.58 mmol) and DIPEA (197 μL, 1.16 mmol). The reaction mixture was heated at 150° C. under microwave irradiation for 30 mins, and diluted with ethyl acetate. The organic layer was washed successively with water, aqueous saturated ammonium chloride, aqueous saturated sodium bicarbonate solution and brine, dried (Na2SO4) and concentrated in vacuo. The resultant residue was purified by flash chromatography (SiO2, 3% MeOH in DCM) to give an off-white solid, which was dissolved in DMSO/water. The mixture was left to stand at RT for 7 days, filtered, and the filtrate was diluted with ethyl acetate and water. The organic layer was washed with brine, dried (Na2SO4) and concentrated in vacuo to give 414 as an off-white solid (42 mg, 21%). LCMS (Method C): RT=8.65 min, [M+H]+=354. 1H NMR (DMSO-d6): 8.32 (1 H, d, J=8.3 Hz), 7.99 (1H, bs), 7.72 (1 H, d, J=0.7 Hz), 7.66 (1 H, dd, J=8.3, 1.8 Hz), 7.57 (1 H, d, J=1.8 Hz), 7.40 (1 H, bs), 4.41 (2 H, t, J=5.0 Hz), 3.45 (2 H, t, J=5.0 Hz), 2.74-2.66 (1 H, m), 1.23-1.15 (2 H, m), 0.93-0.87 (2 H, m).

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