Nucleoside peptides - IX. Synthesis of peptide derivatives of sangivamycic acid and deaminosangivamycic acid
作者:Kandasamy Ramasamy、Roland K. Robins、Ganapathi R. Revankar
DOI:10.1016/s0040-4020(01)85882-8
日期:1988.1
amino acid and peptide conjugates of sangivamycic acid () and deaminosangivamycic acid () have been prepared in which the peptide linkage is on the carboxylic group of the aglycon moiety. The synthesis of these nucleoside peptides was accomplished, generally in excellent yields, a two-step procedure involving HOBT/EDC mediated coupling of either or with an appropriately protected amino acid or peptide
various functional groups was successfully achieved using MnO2-mediated oxidation. Also the highly diastereoselective indolylation of the iminopeptides was realized, which allows selective access to each diastereomer of the adduct from the same substrateusing an appropriate chiral phosphoric acid catalyst. The origin of the diastereoselectivity was elucidated by DFT calculations.
Calixarene amino acids; building blocks for calixarene peptides and peptide-dendrimers
作者:Heng Xu、Gary R Kinsel、Jiang Zhang、Meiling Li、Dmitry M Rudkevich
DOI:10.1016/s0040-4020(03)00947-5
日期:2003.7
A modular strategy towards receptor macromolecules is presented, which combines synthetically diverse peptide synthesis with highly functional calixarene chemistry. The design and synthesis of calix[4]arene amino acids 1a-f, calix-lysines, is described, which were used as construction blocks to assemble nanoscale, multivalent entities-calix-peptides 2 and calix-peptide-dendrimers 3. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis of hypusine and other polyamines using dibenzyltriazones for amino protection
作者:Spencer Knapp、Jeffrey J. Hale、Margarita Bastos、Audrey Molina、Kuang Yu Chen
DOI:10.1021/jo00049a036
日期:1992.11
The use of 1,3-dibenzyl-5-substituted-hexahydro-2-oxo-1,3,5-triazine ("dibenzyltriazone") as a protecting group for primary amino is described. Optimized conditions for formation and hydrolysis of dibenzyltriazones, as well as a variety of transformations (reduction, oxidation, hydroxyl modification, C-C bond formation) compatible with this protecting group, are presented. N-Protected amino aldehydes such as 46, 47, and 94 are particularly valuable building blocks, as demonstrated by the syntheses of hypusine (86), deoxyhypusine (85), spermidine (74), and two unsaturated spermidine analogues 81 and 84.
RAMASAMY, KANDASAMY;ROBINS, ROLAND K.;REVANKAR, GANAPATHI R., TETRAHEDRON, 44,(1988) N 4, 1023-1034
作者:RAMASAMY, KANDASAMY、ROBINS, ROLAND K.、REVANKAR, GANAPATHI R.