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US 6,320,055 B1Granted
Process for preparing hydantoins or cyclic anhydrides of an amino acid
AssigneeBASF SE
InventorsMichael Slany, Michael Schulz, Martin Schäfer, Edgar Zeller, Klaus Ebel
Life of this patent
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Abstract
Process for preparing compounds of the formula I in which R is alkyl or aryl, in each case unsubstituted or substituted, R3 is hydrogen, alkyl or aryl, in each case unsubstituted or substituted, and X═O or NH, which comprises reacting an aldehyde R—CHO with CO and a compound of the formula II in which R2 is a group which reacts with a —CO2H group, which is formed during the reaction, with ring-closure to give compounds of the formula I, in the presence of a transition metal catalyst described.
Claims2
A process for preparing compounds of the formula I
- in which R is alkyl or aryl, in each case unsubstituted or substituted, R3 is hydrogen, alkyl or aryl, in each case unsubstituted or substituted, and X═O,
- which comprises reacting an aldehyde R—CHO with CO and a compound of the formula II
- in which R2 is —OR′ where R′ is alkyl or aryl, or is a —O⊖NH⊕4,
- in the presence of a transition metal catalyst.
1 more element
Dependencies are inferred from the claim text.