2-Methyl-3-butyn-2-ol → 4-Acetylamino-9-(3-hydroxy-3-methyl-but-1-ynyl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

To a stirred mixture of 4-Acetylamino-9-bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (180 mg, 0.453 mmol) in TEA (5 mL) and DMF (1 mL) were added Pd(OAc)2 (20.3 mg, 0.091 mmol), PPh3 (35.6 mg, 0.136 mmol), CuI (17.26 mg, 0.091 mmol) and 2-methylbut-3-yn-2-ol (190.6 mg, 2.266 mmol). The reaction mixture was degassed with N2 and heated in a microwave reactor at 80° C. for 2 h. Then the mixture was cooled to room temperature, and EtOAc was added. The mixture was filtered though Celite, and the filtrate was washed with saturated brine, dried over Na2SO4, filtered, concentrated in vacuo, and purified by flash column chromatography (silica gel, EtOAc in hexane from 10% to 20%) to afford 4-Acetylamino-9-(3-hydroxy-3-methyl-but-1-ynyl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (81 mg, 45%) as a light yellow solid. LC-MS (ESI & APCI): 399.1 (M−1).

Provenance & Evidence