Sulfuric Acid → 5-(3-(3-Methoxypropyl)ureido)-3-(4-nitrophenyl)isothiazole-4-carboxamide

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-(4-cyano-3-(4-nitrophenyl)isothiazol-5-yl)-3-(3-methoxypropyl)urea (12 mg, 0.032 mmol) in 0.8 mL conc. H2SO4 was heated at 45° C. After 1.5 hours the reaction was quenched into 25 mL water containing brine. The aqueous solution was adjusted to pH=1 using saturated NaHCO3 and then extracted with EtOAc, the EtOAc layer washed with brine, dried with anhydrous Na2SO4 and rotary evaporated to a solid. The solid was recrystallized from acetonitrile giving the title compound as a white solid (4 mg, 29%).

Provenance & Evidence