Abstract: The disclosed embodiments detail improved methods for the synthesis of diketopiperazines from amino acids. In particular improved methods for the cyclocondensation and purification of N-protected 3,6-(aminoalkyl)-2,5-diketopiperazines from N-protected amino acids. Disclosed embodiments describe methods for the synthesis of 3,6-bis-[N-protected aminoalkyl]-2,5-diketopiperazine comprising heating a mixture of an amino acid in the presence of a catalyst in an organic solvent. The catalyst is selected from the group comprising sulfuric acid, phosphoric acid, p-toluenesulfonic acid, 1-propylphosphonic acid cyclic anhydride, tributyl phosphate, phenyl phosphonic acid and phosphorous pentoxide among others. The solvent is selected from the group comprising: dimethylacetamide, N-methyl-2-pyrrolidone, diglyme, ethyl glyme, proglyme, ethyldiglyme, m-cresol, p-cresol, o-cresol, xylenes, ethylene glycol and phenol among others.

Abstract: A method for the synthesis of N-protected 3,6-aminoalkyl-2,5-diketopiperazines is provided. The method includes obtaining a cyclic ?-N protected active amino ester and adding it to a mixture of an amine catalyst in an organic solvent.

Abstract: The disclosed embodiments detail improved methods for the synthesis of diketopiperazines from amino acids. In particular improved methods for the cyclocondensation and purification of N-protected 3,6-(aminoalkyl)-2,5-diketopiperazines from N-protected amino acids. Disclosed embodiments describe methods for the synthesis of 3,6-bis-[N-protected aminoalkyl]-2,5-diketopiperazine comprising heating a mixture of an amino acid in the presence of a catalyst in an organic solvent. The catalyst is selected from the group comprising sulfuric acid, phosphoric acid, p-toluenesulfonic acid, 1-propylphosphonic acid cyclic anhydride, tributyl phosphate, phenyl phosphonic acid and phosphorous pentoxide among others. The solvent is selected from the group comprising: dimethylacetamide, N-methyl-2-pyrrolidone, diglyme, ethyl glyme, proglyme, ethyldiglyme, m-cresol, p-cresol, o-cresol, xylenes, ethylene glycol and phenol among others.

Abstract: A method for the synthesis of N-protected 3,6-aminoalkyl-2,5-diketopiperazines is provided. The method includes obtaining a cyclic ?-N protected active amino ester and adding it to a mixture of an amine catalyst in an organic solvent.

Abstract: Disclosed embodiments relate to improved methods for the synthesis of activated fumarate intermediates and their use in chemical synthesis. Disclosed embodiments describe the synthesis of activated fumarate esters including those derived from activating groups including: 4-nitrophenyl, diphenylphosphoryl azide, pivaloyl chloride, chlorosulfonyl isocyanate, p-nitrophenol, MEF, trifluoroacetyl and chlorine, for example, ethyl fumaroyl chloride and the subsequent use of the activated ester in situ. Further embodiments describe the improved synthesis of substituted aminoalkyl-diketopiperazines from unisolated and unpurified intermediates allowing for improved yields and reactor throughput.

Abstract: Phenoxy carboxylic acid compounds and compositions for the delivery of active agents are provided. Methods of administration and preparation are provided as well.

Abstract: The disclosed embodiments detail improved methods for the synthesis of diketopiperazines from amino acids. In particular improved methods for the cyclocondensation and purification of N-protected 3,6-(aminoalkyl)-2,5-diketopiperazines from N-protected amino acids. Disclosed embodiments describe methods for the synthesis of 3,6-bis-[N-protected aminoalkyl]-2,5-diketopiperazine comprising heating a mixture of an amino acid in the presence of a catalyst in an organic solvent. The catalyst is selected from the group comprising sulfuric acid, phosphoric acid, p-toluenesulfonic acid, 1-propylphosphonic acid cyclic anhydride, tributyl phosphate, phenyl phosphonic acid and phosphorous pentoxide among others. The solvent is selected from the group comprising: dimethylacetamide, N-methyl-2-pyrrolidone, diglyme, ethyl glyme, proglyme, ethyldiglyme, m-cresol, p-cresol, o-cresol, xylenes, ethylene glycol and phenol among others.

Abstract: Phenoxy carboxylic acid compounds and compositions for the delivery of active agents are provided. Methods of administration and preparation are provided as well.

Abstract: Phenoxy carboxylic acid compounds and compositions for the delivery of active agents are provided. Methods of administration and preparation are provided as well.

Abstract: Amino acid derivative as carrier compounds and compositions which are useful in the delivery of active agents are provided. The active agents can be a peptide, mucopolysaccharide, carbohydrate, or lipid. Methods of administration, including oral administration, and preparation are provided as well.

Abstract: Amino acid derivative as carrier compounds and compositions which are useful in the delivery of active agents are provided. The active agents can be a peptide, mucopolysaccharide, carbohydrate, or lipid. Methods of administration, including oral administration, and preparation are provided as well.

Abstract: Compositions of precipitated anionic polymers containing mixtures of certain salts as well as processes for making and using the same are disclosed.

Abstract: Compositions of precipitated cationic polymers containing mixtures of certain salts as well as processes for making and using the same are disclosed.

Abstract: Compositions of precipitated cationic polymers containing mixtures of certain salts as well as processes for making and using the same are disclosed.

Abstract: The present invention is directed to a semiconductor device and method wherein a vertical opening is provided or formed completely through a semiconductor substrate of the semiconductor device to print an external electrical contact to be made to one of the semiconductor regions of the semiconductor substrate. In the disclosed embodiment an electrical contact is also provided to the bottom portion of the semiconductor substrate.

Abstract: Compositions of precipitated anionic polymers containing mixtures of certain salts as well as processes for making and using the same are disclosed.

Abstract: Compositions of precipitated cationic polymers containing mixtures of certain salts as well as processes for making and using the same are disclosed.

Abstract: Compositions of precipitated anionic polymers containing mixtures of cationic organic salts and kosmotropic salts as well as processes for making and using the same to condition soil are disclosed.

Abstract: Compositions of precipitated cationic polymers containing mixtures of certain salts as well as processes for making and using the same are disclosed.

Abstract: Compositions of precipitated cationic polymers containing mixtures of certain salts as well as processes for making and using the same are disclosed.