反应详情

To a solution of 1-benzo[1,3]dioxol-4-ylethanol (11 g, 66.3 mmol) in 100 mL of THF was added 17.26 g of manganese dioxide (MnO2) in one portion and reaction was monitored by TLC. After several hours, TLC showed some product but significant alcohol left. More manganese dioxide was added and the solution stirred. TLC then showed mostly product but a significant amount of alcohol. The reaction mixture was then filtered through a bed of diatomaceous earth and the filtrate was concentrated in vacuo to give an oil that mostly crystallized on standing. To 9.24 mL of a solution of oxalyl chloride in 120 mL of dichloromethane at −60° C. was added a solution of 15 mL of DMSO in 20 mL of dichloromethane. After 10 minutes, a solution of above alcohol/ketone mixture (53 mmol) in 20 mL of dichloromethane was added, followed 15 minutes later by 44.3 mL of triethylamine. The reaction was allowed to slowly warm to room temperature overnight. The reaction mixture was then poured onto ice and the organic layer was washed with five 100 mL portions of water, then brine, and then dried over magnesium sulfate. The organics were concentrated in vacuo to leave tan solids and the solids were triturated with hexanes, collected by filtration, and dried to give 9.33 g (85.8% yield) of 1-benzo[1,3]dioxol-4-ylethanone.

1. customin one portion and reaction
2. waitAfter several hours
3. waitleft
4. filtrationThe reaction mixture was then filtered through a bed of diatomaceous earth
5. concentrationthe filtrate was concentrated in vacuo
6. customto give an oil that
7. custommostly crystallized
8. additionTo 9.24 mL of a solution of oxalyl chloride in 120 mL of dichloromethane at −60° C. was added a solution of 15 mL of DMSO in 20 mL of dichloromethane
9. additionThe reaction mixture was then poured onto ice
10. washthe organic layer was washed with five 100 mL portions of water
11. dry with materialbrine, and then dried over magnesium sulfate
12. concentrationThe organics were concentrated in vacuo
13. customto leave tan solids
14. customthe solids were triturated with hexanes
15. filtrationcollected by filtration
16. customdried