Sulfuric Acid → Cyclafuramid

Participants

Reaction Steps

24 parts (by weight) of α-acetoxypropionaldehyde is stirred with 36.6 parts of acetoacetic cyclohexylamide and 1 part of concentrated H2SO4 in 100 parts of toluene for 3 hours at 50° C. After the mixture has been cooled to room temperature it is washed with sodium hydrogen carbonate. The organic phase is dried with Na2SO4 and concentrated to dryness. There is obtained 41 parts of 2,5-dimethylfuran-3-carboxylic cyclohexylamide having a melting point of 111° to 113° C. After recrystallization from cyclohexane the compound melts at 114° to 115° C.

Provenance & Evidence