Convenient synthesis of 7′ and 6′-bromo-d-tryptophan and their derivatives by enzymatic optical resolution using d-aminoacylase
摘要:
Compounds 7' and 61-bromo-D-tryptophan (1 and 2) which are important derivatives for the synthesis of the chloropeptin and kistamycin A, respectively, were conveniently synthesized by optical resolution from N-acetyl-7' and 6-bromo-DL-tryptophan ((RS)-5 and (RS)-14) using D-aminoacylase. (C) 2002 Elsevier Science Ltd. All rights reserved.
氨基和肽,XLVIII总合成和生物化学Bildung von Clionamid-Derivaten
摘要:
模具Totalsynthese冯Tetraacetylclionamid(9)澳大利亚DEM Schwamm Cliona celata wird beschrieben。Das(E)-Enamid wird durch Selenoxid-Eliminierung gebildet。-Eine biomimetische Bildung von N -Boc- O,O',O '' - trimethyldesbromclionamid (13)在脱羧氨基苯甲酸与脱氢氨基苯丙氨酸之间。
The facile synthesis of a series of tryptophan derivatives
作者:Georg Blaser、John M. Sanderson、Andrei S. Batsanov、Judith A.K. Howard
DOI:10.1016/j.tetlet.2008.02.120
日期:2008.4
of 5- and 6-substituted tryptophan derivatives that are difficult to prepare using alternative enzymatic approaches. Acylation of an activated amino acid, derived from serine in situ, is coupled with an enzymatic resolution step to furnish enantiopure analogues bearing a range of electron withdrawing and releasing substituents. Isolation of a dehydroalanine derivative as a by-product from some reactions
Indole Alkaloids from the Sea Anemone<i>Heteractis aurora</i>and Homarine from<i>Octopus cyanea</i>
作者:Kamel H. Shaker、Matthias Göhl、Tobias Müller、Karlheinz Seifert
DOI:10.1002/cbdv.201400406
日期:2015.11
The two new indole alkaloids 2-amino-1,5-dihydro-5-(1H-indol-3-ylmethyl)-4H-imidazol-4-one (1), 2-amino-5-[(6-bromo-1H-indol-3-yl)methyl]-3,5-dihydro-3-methyl-4H-imidazol-4-one (2), and auramine (3) have been isolated from the sea anemone Heteractis aurora. Both indole alkaloids were synthesized for the confirmation of the structures. Homarine (4), along with uracil (5), hypoxanthine (6), and inosine
The total synthesis of (-)-aspergilazine A, an alkaloid possessing a rare N1' to C6 bisindole bond, is described. A palladium-catalyzed N-arylation was used to selectively install the N1'-C6 bond in the presence of three other possible arylation sites. The ligand XPhos displayed a unique capability to efficiently carry out the N-arylation while simultaneously suppressing epimerization of the sensitive C9 stereocenters. This total synthesis has confirmed that aspergilazine A is a dimer of brevianamide F.