反应详情

To a solution of 1-tetralone (164.5 g) in about 400 ml THF was added, in four separate portions, TAMA (243 g) and trioxymethylene (99 g) over 31/2 hours, and the mixture refluxed for 20 hours. The mixture was cooled and portioned between Et2O and water, the layers separated and the aqueous layer extracted twice with Et2O. The combined Et2O layers are exhaustively washed with water, NaHCO3 and then with brine, dried (MgSO4) concentrated in vacuo to yield an oil which is flash chromatographed on silica gel using CH2Cl2 in several runs of 10-20 g per run. Fractions containing the fast moving material are combined, concentrated in vacuo to obtain the desired 2-methylene-1-tetralone.

1. customseparate portions, TAMA (243 g) and trioxymethylene (99 g) over 31/2 hours
2. temperaturethe mixture refluxed for 20 hours
3. temperatureThe mixture was cooled
4. customthe layers separated
5. extractionthe aqueous layer extracted twice with Et2O
6. washThe combined Et2O layers are exhaustively washed with water, NaHCO3
7. dry with materialwith brine, dried (MgSO4)
8. concentrationconcentrated in vacuo
9. customto yield an oil which
10. customchromatographed on silica gel
11. additionFractions containing the
12. concentrationconcentrated in vacuo