Sodium Bicarbonate → HCID 178497502, compound

Participants

Reaction Steps

5-(3-Amino-2-hydroxy-phenyl)-furan-2-carboxylic acid methyl ester 54c (110 mg, 0.47 mmol) was dissolved in hydrochloric acid (1.6 mL, 1 mol/L) upon cooling by an ice-water bath, followed by dropwise addition of 0.6 mL of aqueous sodium nitrite (36 mg, 0.52 mmol). After the mixture was reacted for 10 minutes, 5-methyl-2-(5,6,7,8-tetrahydro-naphthalen-2-yl)-2,4-dihydro-pyrazol-3-one 3i (97 mg, 0.43 mmol) was added. The mixture was adjusted to pH 8˜9 with saturated aqueous sodium bicarbonate. The reaction mixture was reacted at room temperature for 24 hours. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was filtered and the filter cake was dissolved in 15 mL of water. The mixture was adjusted to pH 3˜4 with concentrated hydrochloric acid upon cooling by an ice-water bath. The mixture was filtered and the filter cake was purified by silica gel column chromatography to obtain the title compound 5-(2-hydroxy-3-{N′-[3-methyl-5-oxo-1-(5,6,7,8-tetrahydro-naphthalen-2-yl)-1,5-dihydro-pyrazol-4-ylidene]-hydrazino}-phenyl)-furan-2-carboxylic acid methyl ester 54 (48 mg, yield 23.9%) as a red solid.

Provenance & Evidence