Diisopropylethylamine → 3-{1-[6-Chloro-5-(3,4-dimethyl-2-oxo-2,3-dihydro-benzoxazole-6-carbonyl)-pyridazin-3-yl]-piperidin-4-yl}-7-methoxy-1,3,4,5-tetrahydro-benzo[d][1,3]diazepin-2-one

Participants

Reaction Steps

550 mg (2.00 mmol) 7-methoxy-3-piperidin-4-yl-1,3,4,5-tetrahydro-benzo[d][1,3]diazepin-2-one, 610 mg (1.80 mmol) 6-(3.6-dichloro-pyridazine-4-carbonyl)-3,4-dimethyl-3H-benzoxazol-2-one, 630 mg (4.39 mmol) copper(I)bromide and 430 mL (2.50 mmol) DIPEA in 5 mL DMF were stirred for 2 h at 110° C., then cooled and filtered. The filtrate was combined with 1 mL of a 1N aqueous hydrochloric acid solution and precipitated with 40 mL ice water. The precipitate was suction filtered, washed with water and dried. The solid was stirred with 120 mL DCM/MeOH (11:1), filtered through silica gel and washed with DCM/MeOH. The filtrate was evaporated down. The residue was triturated with diethyl ether, suction filtered and dried. A mixture of isomers was obtained which was further reacted.

Provenance & Evidence