The palladium-catalysed reaction of readily accessible 2-alkynyltrifluoroacetanilides with aryl halides and vinyl triflates under a carbon monoxide atmosphere (1 or 7 atm) and in the presence of potassium carbonate produces 2-substituted-3-acyl indoles in fair to good yield. The acidity of the nitrogen-hydrogen bond proved to be of primary importance for the success of the reaction. The methodology has been applied to the synthesis of pravadoline, a drug that shows analgesic activity against postoperative pain in man.
2-SUBSTITUTED-3-ACYLINDOLES THROUGH THE PALLADIUM-CATALYZED CARBONYLATIVE CYCLIZATION OF 2-ALKYNYLTRIFLUOROACETANILIDES WITH ARYL HALIDES AND VINYL TRIFLATES
ARCADI A;MARINELLI, Fabio
1994-01-01
Abstract
The palladium-catalysed reaction of readily accessible 2-alkynyltrifluoroacetanilides with aryl halides and vinyl triflates under a carbon monoxide atmosphere (1 or 7 atm) and in the presence of potassium carbonate produces 2-substituted-3-acyl indoles in fair to good yield. The acidity of the nitrogen-hydrogen bond proved to be of primary importance for the success of the reaction. The methodology has been applied to the synthesis of pravadoline, a drug that shows analgesic activity against postoperative pain in man.File in questo prodotto:
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