反应详情

3-(7-hydroxy-1-oxoisoquinolin-2(1H)-yl)-4-methylbenzoic acid (885 mg) was dissolved in acetone (50 ml), Sodium iodide (45 mg) and potassium carbonate (4.14 g) were added followed by 4-(2-chloroethyl)piperidine hydrochloride (1.67 g). The resultant mixture was stirred at 60° C. for 18 hours. 2N NaOH (9.4 ml) was added and stirred for 20 minutes, cooled and the insoluble material removed by filtration. The filtrate was concentrated, acidified to pH 1 with concentrated hydrochloric acid and purified by column chromatography on an ion exchange column (isolute SCX column from International Sorbent Technology Limited, Henoed, Mid-Glamorgan, UK) using initially methanol and then a 99:1 mixture of methanol and aqueous ammonia solution to give 4-methyl-3-[7-(2-piperidin-1-ylethoxy)-1-oxoisoquinolin-2(1H)-yl]benzoic acid as an oil (205 mg); NMR Spectrum: (DMSOd6) 2.13 (s, 1H), 3.00 (m, 4H), 3.35 (m, 2H), 3.95 (m, 4H), 4.58 (m, 2H), 6.46 (d, 1H), 6.90 (d, 1H), 7.25 (m, 1H), 7.35 (m, 1H), 7.50 (d, 1H), 7.80 (d, 1H), 7.87 (d, 1H), 7.98 (m, 1H); Mass Spectrum: M+H+ 407.

1. temperaturecooled
2. customthe insoluble material removed by filtration
3. concentrationThe filtrate was concentrated
4. custompurified by column chromatography on an ion exchange column (isolute SCX column from International Sorbent Technology Limited, Henoed, Mid-Glamorgan, UK)
5. additiona 99:1 mixture of methanol and aqueous ammonia solution