反应详情

To a solution of dimethylamine (2M in THF, 50 mL) and saturated aqueous Na2CO3 (100 mL) was added dropwise a solution of compound (E) in toluene (100 mL), prepared as described above, at 0° C. The resulting mixture was allowed to stir for 12 hours. The mixture was extracted with toluene (1×30 mL) and chloroform (3×100 mL). The combined extracts were washed with water (1×30 mL), dried over K2CO3. After evaporation to dryness and crystallization with methyl isobutyl ketone, the desired product (F) dimethyl(tetrahydro-3,3-diphenyl-2-furylidene)ammonium bromide was obtained in 53% yield.

1. customprepared
2. customat 0° C
3. extractionThe mixture was extracted with toluene (1×30 mL) and chloroform (3×100 mL)
4. washThe combined extracts were washed with water (1×30 mL)
5. dry with materialdried over K2CO3
6. customAfter evaporation
7. customto dryness and crystallization with methyl isobutyl ketone