Furosemide → 5-(Aminosulfonyl)-4-chloro-2-[(2-furanylmethyl)amino]benzoyl chloride

Participants

Reaction Steps

A solution of oxalyl chloride (0.040 mole) in dichloromethane (20 mL) is added dropwise to an ice bath cooled solution of furosemide (5-(aminosulfonyl)-4-chloro-2-[(2-furanylmethyl)amino]benzoic acid), (10) (Aldrich) (0.040 mole) in dichloromethane (50 mL). The reaction is stirred at ambient temperature for 5 hours. The reaction solution is washed with 5% aqueous sodium bicarbonate, with water, and then with a saturated sodium chloride solution. The organic layer is dried over sodium sulfate, filtered and concentrated in vacuo to give 5-(aminosulfonyl)-4-chloro-2-[(2-furanylmethyl)amino]benzoyl chloride (13). See D. L. Musso, et. al., J. Med. Chem., (2003) 46: 409.

Provenance & Evidence