Ammonia methanol → 4-Hydroxy-9-(3-hydroxy-3-methyl-but-1-ynyl)-4-methyl-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 4-Hydroxy-9-(3-hydroxy-3-methyl-but-1-ynyl)-4-methyl-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (312 mg, 0.84 mmol) in THF (8 mL) at room temperature, NH3/CH3OH (self-made, 8 mL) was added. The mixture was stirred at room temperature for 3 h, and then concentrated to give a residue which was purified by flash column chromatography (silica gel, EtOAc in hexane from 0 to 50%) to give 4-Hydroxy-9-(3-hydroxy-3-methyl-but-1-ynyl)-4-methyl-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid amide as an off-white solid (212 mg, 71%). 1H NMR (400 MHz, DMSO-d6): δ 8.57 (d, J=2.0 Hz, 1H), 8.47 (s, 1H), 7.90 (s, 1H), 7.31 (dd, J1=8.3 Hz, J2=2.1 Hz, 1H), 7.07 (d, J=8.4 Hz, 1H), 6.26 (s, 1H), 5.46 (s, 1H), 4.21 (d, J=11.7 Hz, 1H), 4.01 (d, J=11.8 Hz, 1H), 1.57 (s, 3H), 1.49 (s, 6H); LC-MS (ESI & APCI): 359.2 (M+1).

Provenance & Evidence