反应详情

温度

0 °C

3-Ethoxymethylisoquinoline (31 g) is dissolved in 95% sulphuric acid (density 1.83; 100 cc). The solution is cooled to 0° C. and a mixture of 95% sulphuric acid (density 1.83; 35 cc) and 70% nitric acid (density 1.42; 10.2 cc) is added dropwise in the course of 30 minutes so as not to exceed 10° C. Stirring is continued for 16 hours whilst allowing the temperature to return to about 20° C. The mixture is then poured into a mixture of ice and water (1 liter), and an ammonia solution containing 20% of NH3 (density 0.9) is added, without exceeding 30° C., until a pH of about 10 is obtained. The yellow suspension is extracted with methylene chloride (4×200 cc). The organic extracts are combined, washed with water (2×50 cc), dried over magnesium sulphate and filtered and the filtrate is evaporated to dryness at 40° C. under reduced pressure (20 mm Hg). 3- Ethoxymethyl-5-nitroisoquinoline (24 g), melting at 54° C., is obtained.

1. additionis added dropwise in the course of 30 minutes so as not
2. customto exceed 10° C
3. customto return to about 20° C
4. additionis added
5. customwithout exceeding 30° C., until a pH of about 10
6. customis obtained
7. extractionThe yellow suspension is extracted with methylene chloride (4×200 cc)
8. washwashed with water (2×50 cc)
9. dry with materialdried over magnesium sulphate
10. filtrationfiltered
11. customthe filtrate is evaporated to dryness at 40° C. under reduced pressure (20 mm Hg)