3-hydroxy-3-(5-hydroxy-2-methyl-1,3-benzothiazol-6-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one → 3-(5-hydroxy-2-methyl-1,3-benzothiazol-6-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one

Participants

Reaction Steps

A suspension of 3-hydroxy-3-(5-hydroxy-2-methyl-1,3-benzothiazol-6-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one (0.50 g, 1.31 mmol) in hydroiodic acid (10.0 mL) was refluxed for 1.5 days. The reaction mixture was concentrated in vacuo to dryness. The residue was used directly in next step.

Provenance & Evidence