Sodium Bicarbonate → HCID 178433806, compound

Participants

Reaction Steps

3-Amino-3′-(1H-tetrazol-5-yl)-biphenyl-2-ol hydrochloride 8f (340 mg, 1.34 mmol) was dissolved in 3 mL of 1 N hydrochloric acid followed by dropwise addition of 3 mL of aqueous sodium nitrite (98 mg, 1.41 mmol) upon cooling by an ice-water bath. 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 (276 mg, 1.21 mmol), sodium bicarbonate (1.69 g, 20 mmol) and 3 mL of ethanol were added successively. The reaction mixture was reacted at room temperature for 18 hours. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was filtered and the filter cake was washed with 20 mL of water and then dissolved in 20 mL of water. Upon cooling by an ice-water bath, the mixture was adjusted to pH 3˜4 with concentrated hydrochloric acid. Then the mixture was filtered and dried to obtain the title compound 4-{[2-hydroxy-3′-(1H-tetrazol-5-yl)-biphenyl-3-yl]-hydrazono}-5-methyl-2-(5,6,7,8-tetrahydro-naphthalen-2-yl)-2,4-dihydro-pyrazol-3-one 10 (208 mg, 31.6%) as a yellow solid.

Provenance & Evidence