Synthesis of densely functionalized pyrrolidinone templates by an intramolecular oxo-Diels–Alder reaction
摘要:
Preparation of densely functionalized pyrrolidinone templates, is a challenge for synthetic chemists. These templates are important building blocks for novel conformationally constrained natural products or for library generation of highly functionalized bi or polycyclic compounds. We discovered that trienes 6a-j undergo facile stereoselective intramolecular Diels-Alder reactions to generate densely functionalized cis fused pyrrolidinone templates 1a-j. These reactions allow for directed remote hydroxylation with complete control of stereochemistry. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthesis of Tetrasubstituted Symmetrical Pyrazines from β-Keto γ-Amino Esters: A Mild Strategy for Self-Dimerization of Peptides
作者:Mothukuri Ganesh Kumar、Varsha J. Thombare、Rupal D. Bhaisare、Anindita Adak、Hosahudya N. Gopi
DOI:10.1002/ejoc.201403237
日期:2015.1
facile synthesis of highly symmetricaltetrasubstitutedpyrazines through simple aerial oxidation of β-ketoγ-aminoesters is reported. The scope of the reaction was examined by use of various amino acid side-chain functional groups and peptides. The mild and efficient transformation of β-ketoγ-aminoesters into pyrazines may serve as an attractive strategy for self-dimerization of peptides.
Based on the X-ray crystallography of recombinant BACE1 and a hydroxyethylamine-type peptidicinhibitor, we introduced a cross-linked structure between the P1 and P3 side chains of the inhibitor to enhance its inhibitoryactivity. The P1 and P3 fragments bearing terminal alkenes were synthesized, and a ring-closing metathesis of these alkenes was used to construct the cross-linked structure. Evaluation
Beta-sheet mimetics and use thereof as inhibitors of biologically active peptides or proteins
申请人:Kahn Michael
公开号:US20060276408A1
公开(公告)日:2006-12-07
There are disclosed β-sheet mimetics and methods relating to the same for imparting or stabilizing the β-sheet structure of a peptide, protein or molecule. In one aspect, β-sheet mimetics are disclosed having utility as protease inhibitors in general and, more specifically, as serine protease inhibitors such as thrombin, elastase and Factor X inhibitors. In one embodiment, the β-sheet mimetic is a thrombin inhibitor.
Efficient synthesis of N-protected amino/peptide Weinreb amides from T3P and DBU
作者:K.M. Sharnabai、G. Nagendra、T.M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2012.11.064
日期:2013.2
The reaction of N-alpha-protected amino/peptide acid with N,O-dimethylhydroxylamine hydrochloride in the presence of T3P and DBU to obtain enantiomerically pure N-alpha-protected amino/peptidyl Weinreb amides in high yields has been described. Fmoc-Ala-Weinreb amide 2a is obtained as single crystal, and its structure was determined through X-ray crystallography. (C) 2012 Elsevier Ltd. All rights reserved.