Dimethylformamide → ethyl 3,4-dihydro-2H-pyran-2-carboxylate

A mixture of sodium 3,4-dihydro-2H-pyran-2-carboxylate (150.0 g, 10 mol), ethyl iodide (192.3 g, 1.2 mol), sodium carbonate (10 g), and dimethylformamide (500 ml) was heated at 105°-110° C. for 5 hours. The reaction mixture was cooled to room temperature and water (450 ml) was added to dissolve inorganic sales. The mixture was extracted with four 200 ml portions of benzene. The combined organic layers were washed with four 200 ml portions of water and dried over anhydrous magnesium sulfate. The solution was filtered and the solvent was removed by rotary evaporation. The oily residue was distilled under reduced pressure giving a yield of 87% of product having a bp of 75°-80° C.

1. temperaturewas heated at 105°-110° C. for 5 hours
2. dissolutionto dissolve inorganic sales
3. extractionThe mixture was extracted with four 200 ml portions of benzene
4. washThe combined organic layers were washed with four 200 ml portions of water
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationThe solution was filtered
7. customthe solvent was removed by rotary evaporation
8. distillationThe oily residue was distilled under reduced pressure

ORD record

ord-0962316e360a49e5bd37dc4764a97df9

Source dataset

uspto-grants-1987_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04677190