Synthesis of Cyclic Peptides by Photochemical Decarboxylation of N-Phthaloyl Peptides in Aqueous Solution
作者:Axel G. Griesbeck、Thomas Heinrich、Michael Oelgemöller、Arne Molis、Axel Heidtmann
DOI:10.1002/hlca.200290027
日期:2002.12
phosphate-buffered aqueous media consequently improved the cyclization yields. The ground-state interactions between amidegroups and the terminal COO− group with the imide CO groups were studied for the model system [N-(phthaloyl)glycyl]sarcosine (1) by NMR spectroscopy where the amide (E/Z)-equilibrium depends on the presence of carboxylate vs. free carboxylic acid, demonstrating the role of H-bonding
A Photochemical Route for Efficient Cyclopeptide Formation with a Minimum of Protection and Activation Chemistry
作者:Axel G. Griesbeck、Thomas Heinrich、Michael Oelgemöller、Johann Lex、Arne Molis
DOI:10.1021/ja025804o
日期:2002.9.1
An elaborated protocol is described which allows the efficient transformation of di-, tri-, and tetrapeptides into cyclopeptides with a minimum of protection and activation chemistry using the photoinduced electron transfer initiated decarboxylation of N-phthaloyl peptides resulting in C-C coupling between the initially formed carbon radicals.
描述了一个详细的协议,它允许使用光诱导电子转移引发的 N-邻苯二甲酰肽的脱羧作用,在最初形成的碳之间产生 CC 耦合,从而有效地将二肽、三肽和四肽转化为环肽,并具有最少的保护和活化化学自由基。
A Synthetic Strategy for the Preparation of Cyclic Peptide Mimetics Based on SET-Promoted Photocyclization Processes
作者:Ung Chan Yoon、Ying Xue Jin、Sun Wha Oh、Chan Hyo Park、Jong Hoon Park、Charles F. Campana、Xiaolu Cai、Eileen N. Duesler、Patrick S. Mariano
DOI:10.1021/ja030297b
日期:2003.9.1
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 alpha-amidosilane or alpha-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 alpha-amidosilane or alpha-amidocarboxylate centers and (2) the nature of the penultimate cation radical a-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.
Takechi, Haruko; Machida, Minoru; Kanaoka,Yuichi, Liebigs Annalen der Chemie, 1986, # 5, p. 859 - 868
作者:Takechi, Haruko、Machida, Minoru、Kanaoka,Yuichi
DOI:——
日期:——
HARUKO, TAKECHI;MINORU, MACHIDA;KANAOKA, YUICHI, LIEBIGS ANN. CHEM., 1986, N 5, 859-868