Glycerol → 7-Methoxy-6-methylquinoline

Participants

Reaction Conditions

Reaction Steps

Using a minimal amount of dioxane, 3-methoxy-4-methylaniline (5.00 g, 36.5 mmol) was slowly added to a mixture of sodium m-nitrobenzenesulfonate (6.62 g, 29.4 mmol), MsOH (20 mL), and FeSO4.7H2O (0.39 g, 1.4 mmol) in a 100 mL round bottom flask heated to an internal temperature of 145-155° C. Glycerol (10.75 g, 116.8 mmol) was then added dropwise via addition funnel while keeping the internal temperature at 145-155° C. After addition, the reaction was stirred in a 150° C. oil bath until LCMS indicated completion (4-6 h). After being cooled to rt, ice (20 g) was added, then the solution was neutralized with 10 N NaOH (calculated to same eq of MsOH) at a speed to keep the internal temperature below 40° C. A thick suspension appeared after addition, and this was extracted with EtOAc (50 mL×3). The organic layer was filtered through a Celite pad to remove insoluble black particles and then purified by flash column chromatography on silica gel to give the desired product (5.0 g, 79%). MS (ES) m/z 174.1 (M+H+).

Provenance & Evidence