159999-80-1Relevant articles and documents
3-AMIDO-PYRROLO[3,4-C]PYRAZOLE-5(1H, 4H,6H) CARBALDEHYDE DERIVATIVES AS INHIBITORS OF PROTEIN KINASE C
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, (2008/12/08)
The present invention relates to compounds and pharmaceutically acceptable salts of Formula (I): wherein X, R1, R2, R3, R4, R5, R6, R7, and R8 are as defined above. The invention further relates to pharmaceutical compositions comprising the compounds and pharmaceutically acceptable salts and to methods of treating diabetes mellitus and its complications (including in particular diabetic retinopathy, nephropathy or neuropathy), cancer, ischemia, inflammation, central nervous system disorders, cardiovascular disease, Alzheimer's disease and dermatological disease pression, viral diseases, inflammatory disorders, or diseases in which the liver is a target organ
A synthetic strategy for the preparation of cyclic peptide mimetics based on SET-promoted photocyclization processes
Yoon, Ung Chan,Jin, Ying Xue,Oh, Sun Wha,Park, Chan Hyo,Park, Jong Hoon,Campana, Charles F.,Cai, Xiaolu,Duesler, Eileen N.,Mariano, Patrick S.
, p. 10664 - 10671 (2007/10/03)
A novel method for the synthesis of cyclic peptide analogues has been developed. The general approach relies on the use of SET-promoted photocyclization reactions of peptides that contain N-terminal phthalimides as light absorbing electron acceptor moieties and C-terminal α-amidosilane or α-amidocarboxylate centers. Prototypical substrates are prepared by coupling preformed peptides with the acid chloride of N-phthalimidoglycine. Irradiation of these substrates results in the generation of cyclic peptide analogues in modest to good yields. The chemical efficiencies of these processes are not significantly affected by (1) the lengths of the peptide chains separating the phthalimide and α-amidosilane or α-amidocarboxylate centers and (2) the nature of the penultimate cation radical α-heterolytic fragmentation process (i.e., desilylation vs decarboxylation). An evaluation of the effects of N-alkyl substitution on the amide residues in the peptide chain showed that N-alkyl substitution does not have a major impact on the efficiencies of the photocyclization reactions but that it profoundly increases the stability of the cyclic peptide.
