3-[1-(tert-Butyl-phenyl-carbamoylmethyl)-2,4-dioxo-5-phenyl-2,3,4,5,-tetrahydro-1H-benzo[b][1,4]diazepin-3-ylmethyl]-indazole-1-carboxylic acid tert-butyl ester → HCID 178449516, compound

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Reaction Steps

263 mg (0.392 mmol) 3-[1-(tert-Butyl-phenyl-carbamoylmethyl)-2,4-dioxo-5-phenyl-2,3,4,5,-tetrahydro-1H-benzo[b][1,4]diazepin-3-ylmethyl]-indazole-1-carboxylic acid tert-butyl ester, prepared as in Intermediate 65, is dissolved in 3 mL 4N HCl in Dioxane and stirred 1 h at ambient temperature. The solvent is removed in vacuo and the residue taken into EtOAc (50 mL), washed with satd. NaHCO3 (30 mL) and brine (30 mL), dried (MgSO4), filtered and concentrated in vacuo. The crude product is purified by flash chromatography on 5 g silica gel eluted successively with EtOAc/Hexanes (1:2, 50 mL), (2:3, 80 mL), (1:1, 50 mL). Appropriate fractions were combined and concentrated in vacuo to give 65 mg (0.113 mmol) of the title compound as a white foam: 1H NMR (CDCl3, 300 MHz) δ7.82 (d, 1H, J=7.5), 7.43-7.06 (m, 16H), 4.19 (m, 2H), 4.08 (m, 1H), 3.79 (m, 1H), 3.63 (m, 1H), 1.37 (s, 9H); low resolution MS (FAB) m/e 572.2 (MH+); TLC Rf =0.41 (EtOAc/Hexanes, 3:2).

Provenance & Evidence