3-Amino-5-methylisoxazole → N-(5-Methyl-1,2-oxazol-3-yl)-6-oxo-7,8,9,10-tetrahydro-6H-pyrido[3',2':4,5]pyrrolo[1,2-a][1,4]diazepine-2-carboxamide

Participants

Reaction Steps

To a solution of 6-oxo-7,8,9,10-tetrahydro-6H-pyrido[3′,2′:4,5]pyrrolo[1,2-a][1,4]diazepine-2-carboxylic acid (Intermediate E, 100 mg, 0.41 mmol) in THF (2 mL) and DMF (0.5 mL) is added HATU (171 mg, 0.45 mmol). The mixture is stirred at room temperature for 1 h, after which 2-tert-butylimino-2-diethylamino-1,3-dimethyl-perhydro-1,3,2-diazaphosphorine on polystyrene (556 mg, 1.22 mmol) is added. The mixture is stirred at room temperature for 10 min and 5-methyl-3-aminoisoxazole (120 mg, 1.22 mmol) is added. The reaction is stirred at 60° C. for 16 h and is then cooled to room temperature. The mixture is filtered, washing with methanol and the filtrate is concentrated under reduced pressure. The residue is purified via preparative HPLC using a gradient elution from 10-90% acetonitrile/H2O with 0.1% TFA to afford the title compound (11 mg, 8%). LCMS: 326.20 (M+H+). (System V-med polar)

Provenance & Evidence