Sodium hydride → tert-Butyl{1-[2-(6,7-dimethoxy-2-oxoquinoxalin-1(2H)-yl)ethyl]piperidin-4-yl}carbamate

Participants

Reaction Steps

6,7-Dimethoxyquinoxalin-2(1H)-one (Intermediate 158, 540 mg, 2.60 mmol) was deprotonated with sodium hydride (60% in oil, 2.90 mmol) and alkylated with 2-{4-[(tert-butoxycarbonyl)amino]piperidin-1-yl}ethyl methanesulfonate (Intermediate 6) (3.9 mmol) as described for Intermediate 2. Chromatography on silica gel with 20-50% acetone in hexanes gave 310 mg (28%) of the product as an off-white solid.

Provenance & Evidence