Реакция #5737

Уравнение реакции

p-toluene sulfonic acid

product

2,2-dimethyl-3-[2-trifluoro methyl-2-bromo-2-chloro-1-methylsulfonyloxyethyl]-cyclopropane carboxylate

→

2,2-dimethyl-3-[2-trifluoromethyl-2-bromo-2-chloro-1-methylsulfonylethyl]-cyclopropane carboxylic acid

Растворители

methylene chloride

Условия реакции

Обработка

1. 1
   workup.ADDITIONpoured on to ice
2. 2
   Другоеdecanted
3. 3
   ПромывкаThe organic phase was washed with water
4. 4
   Другоеdried on sodium sulfate
5. 5
   Другоеevaporated to dryness under reduced pressure

Методика

30 mg of p-toluene sulfonic acid were added at 40° C. to a solution of 1 g of the product of Step B and 10 ml of methylene chloride and the reaction mixture was heated for 5 hours at 40° C., then poured on to ice, and decanted. The organic phase was washed with water, dried on sodium sulfate and evaporated to dryness under reduced pressure to obtain 860 mg of [1R-[1α-,3α-(RS*,RS*)]] 2,2-dimethyl-3-[2-trifluoromethyl-2-bromo-2-chloro-1-methylsulfonylethyl]-cyclopropane carboxylic acid melting at 138° C.

Источник