Ethanolamine → HCID 178472033, compound

Participants

Reaction Steps

Employing ethyl 2-(2-methyl-3,4,5,6-tetrafluorobenzoyl)-3-ethoxyacrylate (7.0 g) and ethanol amine (1.33 ml), the procedure of Reference Example 21 is repeated to give ethyl 2-(2-methyl-3,4,5,6-tetraflurobenzoyl)-3-(2-hydroxyethyl)aminoacrylate. To the product are added pyridine (70 ml) and acetic anhydride (2.57 ml) and the mixture is stirred at room temperature over-night. After concentration, the resultant is diluted with water, subjected to extraction with dichloromethane, and the extract is washed with water and then with a saturated saline solution and dried to give ethyl 2-(2-methyl-3,4,5,6-tetrafluorobenzoyl)-3-(2-acetyloxyethyl) aminoacrylate, which is then treated with 60% sodium hydride (1.09 g) as in Reference Example 22 to give ethyl 1-(2-acetyloxyethyl)-5-methyl-6,7,8-trifluoro-1,4-dihydro-4 -oxoquinoline-3carboxylate (6.15 g), as colorless prisms (recrystallized from ethyl acetate), m.p. 192°-193° C.

Provenance & Evidence