Diisopropylamine → 3-(3-Fluoro-phenylamino)-6,7-dimethoxy-4H-indeno[1,2-c]pyrazole-1-carboxylic acid isopropyl ester

Participants

Reaction Steps

A solution of (6,7-Dimethoxy-2,4-dihydro-indeno[1,2-c]pyrazol-3-yl)-(3-fluoro-phenyl)-amine HCl (Compound 14) (0.50 g, 0.0014 mole), THF (10 mL), and Diisopropyl amine (0.512 mL, 0.00295 mole) was stirred until the solid completely dissolved. Isopropyl chloroformate (1.5 mL, 0.0015 mole) was added slowly at room temperature. The reaction mixture was stirred at room temperature overnight. The solvent was removed in vacuo from the resulting organics. Attempt to separate resulting isomers with reverse-phase chromatography was not successful. Placed isomer containing fractions in refrigerator. Much of major isomer crystallized. Filtered white crystals of title compound from solution (Compound 436). MS m/z 412 (M+H)+;

Provenance & Evidence