Methanesulfonic Acid → HCID 131721532, compound

Participants

Reaction Steps

A mixture of 1-ethyl-6-methoxy-N-(4-methoxyphenylmethyl)-1H-pyrazolo[3,4-b]quinolin-4-amine (1.0 g, 2.76 mmol), boron tribromide (6 mL, 6 mmol) and 1,2-ethylenedichloride (30 mL) was stirred at room temperature overnight. The reaction mixture was poured into water and then was basified with NaOH. The layers were separated and then the aqueous layer was acidified with acetic acid. The precipitate which formed was collected by filtration, washed with water and dried to afford the product as the free base. The free base was taken up in methanol and treated with methanesulfonic acid. The methanol was evaporated and the solid residue was recrystallized from 2-propanol/methanol/ether and dried in vacuo to afford 350 mg of 1-ethyl-6-hydroxy-N-(4-hydroxyphenyl methyl)-1H-pyrazolo[3,4-b]quinolin-4-amine-CH3SO3H.

Provenance & Evidence