Catalysis of diketopiperazine synthesis
First Claim
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1. A method for the synthesis of N-protected bis-3,6-[4-aminobutyl]-2,5-diketopiperazine comprising the step of heating a solution of ε
- -amino protected lysine in the presence of a catalyst selected from the group consisting of sulfuric acid, phosphoric acid, and phosphorus pentoxide.
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Abstract
Provided is a method for the synthesis of N-protected bis-3,6-[4-aminobutyl]-2,5-diketopiperazine including the step of heating a solution of c-amino protected lysine in the presence of a catalyst selected from the group consisting of sulfuric acid, phosphoric acid, and phosphorus pentoxide.
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24 Claims
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1. A method for the synthesis of N-protected bis-3,6-[4-aminobutyl]-2,5-diketopiperazine comprising the step of heating a solution of ε
- -amino protected lysine in the presence of a catalyst selected from the group consisting of sulfuric acid, phosphoric acid, and phosphorus pentoxide.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for the synthesis of N-protected bis-3,6-[4-aminobutyl]-2,5-diketopiperazine comprising the step of heating a solution of ε
- -amino protected lysine in the presence of a catalyst wherein synthesis is substantially complete within about 10 hours of reaching a target temperature.
- View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for the synthesis of N-protected bis-3,6-[4-aminobutyl]-2,5-diketopiperazine comprising the step of heating a solution of ε
- -amino protected lysine in the presence of a catalyst wherein said synthesis has a yield of greater than 50%.
- View Dependent Claims (21, 22, 23, 24)
Specification