Succinic Acid → HCID 21108213, compound

Participants

Reaction Steps

A solution of 1-naphthalenesulfonyl chloride (388 mg, 1.72 mmol) in acetonitrile (5 ml) was added to a solution of 3,4-dihydro-6-[2-(N,N-propylamino)ethyl]-2H-1,4-benzoxazine hydrochloride (300 mg, 1.14 mmol) obtained in Example 134, 4-dimethylaminopyridine (140 mg, 1.14 mmol) and triethylamine (0.48 ml, 3.43 mmol) in acetonitrile (15 ml) under cooling with ice-bath, and the mixture was stirred at room temperature for 4 hours. Water (50 ml) was added to the reaction solution which was then extracted with ethyl acetate. The extract was washed with 10% aqueous potassium carbonate and a saturated saline solution, dried over anhydrous sodium sulfate and concentrated. The residues were purified by silica gel column chromatography (developing solvent; ethyl acetate), and succinic acid (1 equivalent) was added thereto, and the product was recrystallized from ethyl acetate-diisopropyl ether, whereby the title compound (220 mg) was obtained as crystals with a mp of 144 to 145° C.

Provenance & Evidence