Two carbon homologation of carboxylic acids via carbon radicals generated from the acyl derivatives of N-hydroxy-2-thiopyridone: Synthesis of Cn+2 α-keto-acids from Cn acids. (The ‘three carbon’ problem).
摘要:
Reaction of olefins containing a three carbon atom chain with carbon radicals generated from carboxylic acids furnishes adducts that are precursors of the corresponding two carbon atom longer alpha-keto-acids. The keto-acids are furnishes in high overall yield.
Two carbon homologation of carboxylic acids via carbon radicals generated from the acyl derivatives of N-hydroxy-2-thiopyridone: Synthesis of Cn+2 α-keto-acids from Cn acids. (The ‘three carbon’ problem).
Reaction of olefins containing a three carbon atom chain with carbon radicals generated from carboxylic acids furnishes adducts that are precursors of the corresponding two carbon atom longer alpha-keto-acids. The keto-acids are furnishes in high overall yield.
The invention of radical reactions. Part XXXIV. Homologation of carboxylic acids to α-keto carboxylic acids by Barton-ester based radical chain chemistry
Carboxylicacids can be transformed into the homologous α-ketoacids by Barton-esterbasedradicalchemistry. This method was especially successful when ethyl α-trifluoroacetoxy acrylate was used as a radical trap.