Ammonia methanol → 9-(3-Hydroxy-3-methyl-but-1-ynyl)-4-oxo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid amide

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Reaction Steps

To a solution of 9-(3-Hydroxy-3-methyl-but-1-ynyl)-4-oxo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (81 mg, 0.23 mmol) in THF (4 mL) at room temperature, NH3/CH3OH (self-made, 4 mL) was added. The mixture was stirred at room temperature for 3 h, then concentrated to give 9-(3-Hydroxy-3-methyl-but-1-ynyl)-4-oxo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid amide as a yellow oil, which was used in the next step without any further purification (crude, 80 mg). 1H NMR (400 MHz, DMSO-d6): δ 830 (s, 1H), 8.43 (d, J=2.1 Hz, 1H), 8.18 (s, 1H), 7.50 (dd, J1=8.4 Hz, J2=2.2 Hz, 1H), 7.26 (d, J=8.4 Hz, 1H), 5.48 (s, 1H), 4.87 (s, 2H), 1.47 (s, 6H); LC-MS (ESI & APCI): 343.2 (M+1).

Provenance & Evidence