反应详情

To a solution of 2-methyl-4-{methylsulfanyl-[(E)-trimethylsilanylmethylimino]-methyl}-benzoic acid tert-butyl ester (see Example I9) (118 mg) in dichloromethane (15 ml) was added trifluoroacetic acid (0.22 ml). The reaction mixture was stirred at ambient temperature for 20 hours. Further trifluoroacetic acid (0.11 ml) was added and the mixture was stirred for another 3 hours at ambient temperature. Water was added and the mixture was extracted twice with dichloromethane. The combined organic phases were washed with brine, dried over sodium sulfate and concentrated to give 2-methyl-4-{methylsulfanyl-[(Z)-trimethylsilanyl methylimino]methyl}-benzoic acid which was used without further purification in the subsequent step.

1. stirringthe mixture was stirred for another 3 hours at ambient temperature
2. extractionthe mixture was extracted twice with dichloromethane
3. washThe combined organic phases were washed with brine
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated