Potassium Iodide → tert-Butyl {2-[3-(2,3-dihydro-1-ethyloxycarbonyl-3-oxo-indazol-2-yl)-propylsulfanyl]-benzoimidazol-1-yl}-acetate

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Reaction Steps

A mixture of tert-butyl (2-mercapto-benzoimidazol-1-yl)-acetate (Intermediate 3-I, 66 mg, 0.25 mmol), 2-(3-chloro-propyl)-3-oxo-2,3-dihydro-indazole-1-carboxylic acid ethyl ester (alkylating agent G-01d, 70 mg, 0.25 mmol), a few crystals of potassium iodide and K2CO3 (69 mg, 0.5 mmol) in acetone (1 ml) is refluxed overnight. Evaporation of the solvent under a stream of air affords a residue that is purified by flash-chromatography on silica-gel (AcOEt/heptane, 3:2), yielding the title compound as a colourless oil: tR=2.75 min (LC-2), ESI-MS (pos.): m/z 511.15 [M+H]+; 1H-NMR (CDCl3): δ (ppm) 1.37 (s, 9H, tBu), 1.37 (t, 3H, CH3), 2.14 (quint., 2H, CH2CH2N), 3.28 (m, 2H, SCH2), 4.30-4.40 (m, 4H), 4.69 (s, 2H, CH2CO2), 7.10 (m, 3Harom), 7.26 (t, 1Harom), 7.55 (m, 2Harom), 7.81 (t, 2Harom).

Provenance & Evidence