Hydrochloric Acid → HCID 72360026, compound

Participants

Reaction Steps

To a N-methyl-2-pyrrolidinone (1.0 mL) solution of 2-nitro-4-[(2-{1-[5-(4-t-butylphenyl)-4-hydroxy-3-thienyl]-ethylidene}hydrazino)carbonyl]benzoic acid (50 mg, 0.10 mmol, see the synthetic example 47) and triethylamine (16 μL, 0.11 mmol) was added isobutyl chloroformate (26 μL, 0.20 mmol) at 0° C. The reaction mixture was stirred for 2 hours at this temperature, and then N-methyl piperazine (45 μL, 0.40 mmol) was added. After stirring for 1 hour is at room temperature, the reaction mixture was acidified with 1M aqueous HCl solution (1.0 mL) and concentrated under the reduced pressure. To the residue was added water, then the precipitate was collected by filtration, washed with water, isopropanol and methanol, then dried by means of a vacuum pump to give the desired product as a pale yellow solid (yield 10%).

Provenance & Evidence