A multi-component reaction between a ketone, potassium cyanide and ammonium carbonate, which leads to the formation of hydantoins.
A pre-formed cyanohydrin can react with ammonium carbonate to give the same product:
Mechanism of the Bucherer-Bergs Reaction
The Bucherer-Bergs Reaction is equivalent to the Strecker Synthesis with "additional CO2". Hydantoins may be opened to yield N-carbamoylamino acids which form amino acids by treatment with acid or with a suitable enzyme: