Methyl iodide → HCID 15128679, compound

Participants

Reaction Conditions

Reaction Steps

To 25 mmole (3 equiv.) of a freshly prepared solution of lithium diisopropylamide in tetrahydrofuran (prepared by addition of 9.6 ml of a 2.6 M solution of n-butyllithium in hexane to 7.5 ml of freshly distilled diisopropylamine in 50 ml of tetrahydrofuran at -78° C.) was added 3.0 g of 7-chloro-1,3,4,5-tetrahydro-3-(methoxycarbonyl)-4-(4-methoxyphenyl)-2H-1-benzazepin-2-one (8.35 mmole). After stirring at -78° C. for 1.5 hours, 1.5 ml of hexamethylphosphoric triamide was added along with 5.9 g of iodomethane (41.7 mmole, 5 equiv.). The reaction mixture was stirred at -78° C. to 20° C. for 6 hours, then quenched with 50 ml of 1N hydrochloric acid. The stirring was continued at 50° C. for 30 minutes. The layers were separated. The aqueous layer was extracted with two 50 ml portions of ethyl acetate. The combined organic layer was washed with two 20 ml portions of saturated sodium bicarbonate, 20 ml of water then dried (magnesium sulfate) and concentrated. The residue was purified on a silica gel column. Elution with 25% ethyl acetate/hexanes gave 1.4 g of 7-chloro-1,3,4,5-tetrahydro-3-(methoxycarbonyl)-4-(4-methoxyphenyl)-3-methyl-2H-1-benzazepin-2-one as a white solid.

Provenance & Evidence