Oxalyl chloride → 1-(4,5-dihydro-1H-imidazol-2-ylmethyl)-1H-indole-3-sulfonyl chloride

Participants

Reaction Steps

1-(4,5-Dihydro-1H-imidazol-2-ylmethyl)-1H-indole-3-sulfonic acid hydrochloride (1.52 g, 4.814 mmol) from Step 3 was dissolved/suspended in methylene chloride (25 mL) and stirred at room temperature. Oxalyl chloride (2 mL) was added dropwise to the mixture, after which stirring was continued for 3 hours. The mixture was then evaporated to dryness, and excess oxyalyl chloride was azeotroped off with methylene chloride (3×) to provide 1-(4,5-dihydro-1H-imidazol-2-ylmethyl)-1H-indole-3-sulfonyl chloride as a hydrochloride salt.

Provenance & Evidence