Catalysis of diketopiperazine synthesis
First Claim
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1. A method for the synthesis of N-protected 3,6-bis[4-aminoalkyl]-2,5-diketopiperazine comprising heating a solution comprising N-benzyloxycarbonyl-lysine 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 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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24 Claims
- 1. A method for the synthesis of N-protected 3,6-bis[4-aminoalkyl]-2,5-diketopiperazine comprising heating a solution comprising N-benzyloxycarbonyl-lysine and phosphorus pentoxide.
- 11. A method for the synthesis of 3,6-di(4-fumarylaminobutyl)2,5-diketopiperazine comprising heating a solution comprising N-benzyloxycarbonyl-lysine in the presence of a catalyst selected from the group consisting of sulfuric acid, phosphoric acid, and phosphorus pentoxide, to synthesize N-protected 3,6-bis[4-aminoalkyl]-2,5-diketopiperazine.
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