反应详情

A solution of 307.56 g. of desoxyanisoin in three liters of diethyl ether was cooled to about 0° C. by means of an external ice/alcohol bath. Under a nitrogen atmosphere, 441 ml. of dimethylamine were added to the solution with stirring. A solution of 79 ml. of titanium tetrachloride in 500 ml. of toluene was then added to the reaction mixture over a 90 minute period at such a rate to keep the temperature below 5° C. The reaction was then allowed to stir overnight at room temperature. The reaction was filtered and the precipitate was washed with two liters of diethyl ether. The ether filtrate and wash were combined and evaporated in vacuo. The residue was crystallized from ether/Skelly B to provide 272.2 g. of the desired title intermediate, m.p. about 67°-69° C.

1. customthe temperature below 5° C
2. stirringto stir overnight at room temperature
3. filtrationThe reaction was filtered
4. washthe precipitate was washed with two liters of diethyl ether
5. washThe ether filtrate and wash
6. customevaporated in vacuo
7. customThe residue was crystallized from ether/Skelly B
8. customto provide 272.2 g