Putative hydrolyzed metabolites of thalidomide were prepared and characterized, and their inhibitory activity on tumor necrosis factor (TNF)-α production in the human monocytic leukemia cell line THP-1 was evaluated. α-(2-Carboxybenzamido)glutarimide was a more potent TNF-α production inhibitor than thalidomide.
Novel isoindoline compounds are disclosed. Methods of treating, preventing and/or managing cancer, diseases and disorders associated with, or characterized by, undesired angiogenesis, and diseases and disorders mediated by PDE 4, using the compounds are also disclosed.
Drawing inspiration from the initiating amino acid modification in biosynthetic peptides, we have successfully demonstrated a biomimetic mechanism for N-to-C terminal extension in prebiotic peptide synthesis. This achievement was accomplished by using acetylated amino acid amides as the N-terminal substrate for peptide synthesis and amino acid amides as the C-terminal extension, with the reaction carried
受生物合成肽中起始氨基酸修饰的启发,我们成功证明了益生元肽合成中 N 至 C 末端延伸的仿生机制。这一成果是通过使用乙酰化氨基酸酰胺作为肽合成的N端底物,以氨基酸酰胺作为C端延伸,反应在80℃下以干湿循环进行,不需要任何活化剂。这为益生元肽的形成提供了一条合理的途径。
King et al., Journal of the Chemical Society, 1951, p. 239,242
作者:King et al.
DOI:——
日期:——
3-[(Phenylacetyl)amino]-2,6-piperidinedione Hydrolysis Studies with Improved Synthesis and Characterization of Hydrolysates
作者:Larry K. Revelle、D. André d'Avignon、Joe A. Wilson
DOI:10.1021/js960120y
日期:1996.10
In an attempt to clarify ambiguities in earlier reports on the preclinical chemistry of Antineoplaston A10 (3-[(phenylacetyl)amino]-2,6-piperidinedione; PAP), we detail herein hydrolysis studies with improved synthesis and characterization of PAP hydrolysis products, (phenylacetyl)glutamine (PAG), (phenylacetyl)isoglutamine (PAIG), and (phenylacetyl)glutamic acid (PAGA). Flash chromatography proved superior to extraction in the isolation of synthetic standards and hydrolysates. Synthesis of PAIG directly from commercial isoglutamine showed consistently better yields than the previously reported method. The H-1 and C-13 NMR and HPLC-MS data from the synthesized standards matched the data from the isolated PAP hydrolysates formed under acid and alkaline degradation conditions. Multiple quantum coherence NMR methods (HMQC and HMBC) and HPLC-MS-MS methods were applied to provide unambiguous structural assignments for key isomers PAG and PAIG. Previous PAP hydrolysis studies are shown to be reproducible, and the structures of hydrolysis products are elucidated in detail.