Total Synthesis of the Chlorinated Marine Natural Product Dysamide B
摘要:
[GRAPHICS]Two approaches to the synthesis of (2S,4S)-5,5-dichloroleucine are compared, and the parent amino acid was used in the first total synthesis of the polychlorinated marine natural product, dysamide B. A key step was the lead tetraacetate-mediated decarboxylation of an alpha, alpha-dichloro acid in the presence of 1,4-cyclohexadiene to generate the dichloromethyl group.
Total Synthesis of the Chlorinated Marine Natural Product Dysamide B
摘要:
[GRAPHICS]Two approaches to the synthesis of (2S,4S)-5,5-dichloroleucine are compared, and the parent amino acid was used in the first total synthesis of the polychlorinated marine natural product, dysamide B. A key step was the lead tetraacetate-mediated decarboxylation of an alpha, alpha-dichloro acid in the presence of 1,4-cyclohexadiene to generate the dichloromethyl group.
Stereochemical Assignments of the Chlorinated Residues in Victorin C
作者:Christine Willis、Amanda Durow、Craig Butts
DOI:10.1055/s-0029-1216910
日期:2009.9
Victorins are cyclic pentapeptide natural products isolated from the fungus Cochliobus victoriae. Using a combination of synthesis and spectroscopic methods we have assigned the geometry of the vinyl chloride residue and determined the stereochemistry of the 5,5-dichloroleucine moiety.
Halogenation of Unactivated Carbon Centers in Natural Product Biosynthesis: Trichlorination of Leucine during Barbamide Biosynthesis
作者:Danica P. Galonić、Frédéric H. Vaillancourt、Christopher T. Walsh
DOI:10.1021/ja060151n
日期:2006.3.1
The in vitro reconstitution of leucine halogenation during barbamide biosynthesis has been accomplished. It has been demonstrated that the triple chlorination of the unactivated pro-R methyl group of the peptidyl carrier protein-tethered l-Leu substrate is carried out by the tandem action of two nonheme iron(II)-dependent halogenases, BarB1 and BarB2. Investigation of the substrate specificities of
A study of polychlorinated leucine derivatives: synthesis of (2S,4S)-5,5-dichloroleucine
作者:Ana Ardá、Carlos Jiménez、Jaime Rodrı́guez
DOI:10.1016/j.tetlet.2004.02.118
日期:2004.4
The first total synthesis of (2S,4S)-5,5-dichloroleucine has been achieved in 11 steps from L-pyroglutamic acid. A key step is the dichlorination process on the hydrazone of aldehyde 13 with CuCl2 in triethylamine. (C) 2004 Elsevier Ltd. All rights reserved.