Pyridine → HCID 67271996, compound

Participants

Reaction Steps

Commercially available N-Boc-5-indoleboronic acid (0.30 g, 1.1 mmol) was dissolved in CH2Cl2 (20 mL) and pyridine (1 mL) with molecular sieves (activated 4 A) and stirred overnight at RT. Commercially available ethyl 3-t-butyl-1 H-pyrazole-5-carboxylate, Cu(OAc)2 and molecular sieves (4 A activated, powder) were added to the boronic acid solution and the whole stirred at RT open to the atmosphere for 2d. The reaction mixture was filtered through a pad of Celite®, concentrated and purified by column chromatography to yield ethyl 5-(3-t-butyl-5-(ethoxycarbonyl)-1H-pyrazol-1-yl)-1H-indole-1-carboxylate (0.18 g, 38% yield). LC-MS (EI) m/z: 412.3 (M+H+).

Provenance & Evidence