Catalysts for the enantioselective epoxidation of C═C double bonds
AssigneeDegussa AG
InventorsKarlheinz Drauz, Stan M. Roberts, Thomas Geller, Anupma Dhanda
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Abstract
Compositions are disclosed which comprise a homopolyamino acid and stereoisomers thereof adsorbed on an insoluble support material. The compositions are useful as catalysts for the stereoselective epoxidation of olefins.
Claims11
A composition comprising a mixture of a first optical isomer of polyneopentylglycine, the enantiomer of said first optical isomer, and a diastereomer of said first optical isomer, wherein the amount of said first optical isomer exceeds the amount of said enantiomer of said first optical isomer and the amount of diastereomer of said first optical isomer, but is less than 100% of the total weight of polyneopentylglycine in said mixture.
A composition comprising a mixture of a first optical isomer of polyneopentylglycine, the enantiomer of said first optical isomer, and a diastereomer of said first optical isomer, wherein:
- (a) said first optical isomer of polyneopentylglycine is in a form crosslinked by means of polyfunctional compounds;
- and
- (b) the amount of said first optical isomer exceeds the amount of said enantiomer of said first optical isomer and said diastereomer of said first optical isomer, but is less than 100% of the total weight of polyneopentylglycine in said mixture.
A composition comprising a mixture of a first optical isomer of polyneopentylglycine having a chain length of 5 to 100 amino acids, the enantiomer of said first optical isomer and a diastereomer of said first optical isomer,
- wherein the amount of said first optical isomer exceeds the amount of said enantiomer of said first optical isomer and the amount of the diasteromer of said first optical isomer but is less that 100% of the total weight of polyneopentylglycine in said mixture, and wherein said mixture is adsorbed onto an insoluble support material.
A composition comprising a mixture of a first optical isomer of polyneopentylglycine having a chain length of 5 to 100 amino acids, the enantiomer of said first optical isomer and a diastereomer of said first optical isomer,
- wherein the amount of said first optical isomer exceeds the amount of said enantiomer of said first optical isomer and the amount of the diasteromer of said first optical isomer but is less that 100% of the total weight of polyneopentylglycine in said mixture, and wherein said polyneopentylglycine is enlarged with organic polymers.
A process for preparing polyneopentylglycine comprising:
- (a) reacting molecules of neopentylglycine N-carboxyanhydride by nucleo-philically initiated polymerization, said reaction proceeding for a time and under conditions effective to produce polyneopentylglycine;
- and
- (b) recovering said polyneopentylglycine.
A process for preparing an optically active epoxide, comprising:
- (a) reacting an olefin-containing compound with an oxidizing agent in the presence of polyneopentylglycine adsorbed on an insoluble support material, for a time and under conditions effective to convert the olefin to said optically active epoxide;
- and
- (b) recovering said optically active epoxide.
Dependencies are inferred from the claim text.