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0 °C

A suspension of 8-bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carboxylic acid N-isopropyl-hydrazide dihydrochloride (2.69 g, 6.1 mmol) in DCM (61 mL) was treated with TEA (3.84 mL, 27.6 mmol). The resultant solution was cooled to 0° C. before methoxyacetyl chloride (1.12 mL, 12.3 mmol) was added dropwise and the reaction stirred at 0° C. for 1.75 h. The reaction was quenched with saturated sodium bicarbonate solution and the phases separated. The aqueous phase was extracted with DCM (×2) before the combined organic phases were washed sequentially with 10% citric acid solution, saturated sodium bicarbonate solution and brine. The organic solution was dried (Na2SO4), concentrated in vacuo and the resultant solid was triturated with diethyl ether to give 8-Bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carboxylic acid N-isopropyl-N′-(2-methoxy-acetyl)-hydrazide as an off-white solid (2.29 g, 5.24 mmol, 86%). LCMS RT=4.29 min, [M+H]+=437/439. 1H NMR 400 MHz (DMSO-d) δ: 9.61 (1 H, s), 8.29 (1 H, d, J=8.63 Hz), 7.71 (1 H, s), 7.27 (1 H, dd, J=8.64, 2.06 Hz), 7.21 (1 H, d, J=2.06 Hz), 4.84 (1H, t, J=6.91 Hz), 4.45 (4 H, s), 3.92 (2 H, s), 3.33 (3 H, s), 1.15 (6 H, d, J=6.66 Hz)

1. additionwas added dropwise
2. customThe reaction was quenched with saturated sodium bicarbonate solution
3. customthe phases separated
4. extractionThe aqueous phase was extracted with DCM (×2) before the combined organic phases
5. washwere washed sequentially with 10% citric acid solution, saturated sodium bicarbonate solution and brine
6. dry with materialThe organic solution was dried (Na2SO4)
7. concentrationconcentrated in vacuo
8. customthe resultant solid was triturated with diethyl ether