Diisopropylethylamine → [4-(3,6-Dimethyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-2-fluoro-benzyl]-carbamic Acid Tert-butyl Ester

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Reaction Steps

A solution of 4-(tert-butoxycarbonylamino-methyl)-3-fluorobenzoic acid from Example E3.1 (538 mg, 2.0 mmol) and DMAP (220 mg, 1.8 mmol) in dichloromethane (20 ml) at room temperature was treated with DIEA (0.93 ml, 5.4 mmol) and WSCD (460 mg, 2.4 mmol), and the resulting solution was stirred at room temperature for 1 h. 3,6-Dimethyl-3,4,9,10-tetrahydro-2,3,4,9-tetraaza-benzo[f]azulene from Example E2 (385 mg, 1.8 mmol) was added and the resulting solution was heated at reflux for 20 h and allowed to cool to room temperature. The solution was diluted with dichloromethane, washed with saturated NaHCO3 and brine and concentrated in vacuo. The residue was purified by preparative HPLC (eluant 10% methanol:90% dichloromethane) to yield the title compound (265 mg, 32%).

Provenance & Evidence