反应详情

温度

5 °C

A suspension of 1.385 kg of 4-methoxycarbonyl-1-methylpyridinium iodide in 25 liters of dry methanol was stirred and cooled to 5° C. and 700 g of sodium borohydride were added thereto in portions over 1 hour with the temperature held at 5°-10° C. When the addition was complete, the resultant solution was stirred at room temperature for another hour and was then concentrated to 5 to 7 liters. 25 liters of water were added thereto followed by addition of 2 kg of solid sodium carbonate. The solution thus obtained was extracted 3 times with 2.5 liters of chloroform and the organic phase was dried over Na2SO4 and was evaporated to dryness. The residual oil was distilled to obtain 583 g of methyl 1,2,3,6-tetrahydro-1-methylisonicotinate (67.1% yield) boiling at 78° C. at 1 mm Hg.

1. additionWhen the addition
2. concentrationwas then concentrated to 5 to 7 liters
3. addition25 liters of water were added
4. additionthereto followed by addition of 2 kg of solid sodium carbonate
5. customThe solution thus obtained
6. extractionwas extracted 3 times with 2.5 liters of chloroform
7. dry with materialthe organic phase was dried over Na2SO4
8. customwas evaporated to dryness
9. distillationThe residual oil was distilled