HCID 178433821, compound → HCID 178433823, compound

Participants

Reaction Steps

(Z)-4-(2-hydroxy-3-{N′-[3-methyl-5-oxo-1-(5,6,7,8-tetrahydro-naphthal-2-yl)-1,5-dihydro-pyrazol-4-ylidene]-hydrazino}-phenyl)-furan-2-carboxylic acid 22f (1.2 g, 2.6 mmol) was dissolved in 20 mL of tetrahydrofuran to form a dark red suspension. The reaction mixture was added with ethanolamine (399 mg, 6.5 mmol) to form a purple solution, and stirred for 6 hours at room temperature. A great quantity of the solid was precipitated from the solution, filtered, then the filter cake was washed with tetrahydrofuran (1 mL×3) and dried in vacuo to obtain the title compound (Z)-4-(2-hydroxy-3-{N′-[3-methyl-5-oxo-1-(5,6,7,8-tetrahydro-naphthal-2-yl)-1,5-dihydro-pyrazol-4-ylidene]-hydrazino}-phenyl)-furan-2-carboxylic acid bis-(ethanolamine) 22 (1.51 g, as a red solid) yield 72.8%.

Provenance & Evidence