Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Structural revision and total synthesis of caraphenol B and C.

ABSTRACT: Chemical syntheses of two stereochemically unique resveratrol dimers, caraphenols B and C, have shown that their structures are misassigned. Thoughts on their potential chemical etiology led to an alternate structural proposal that has been confirmed through synthesis, one indicating that the substituents on their respective indane systems exist in a relative trans,trans orientation rather than the originally postulated all-cis arrangement.

SUBMITTER: Snyder SA

PROVIDER: S-EPMC3224822 | biostudies-other | 2011 Oct

REPOSITORIES: biostudies-other

ACCESS DATA

Json Xml

Publications

Structural revision and total synthesis of caraphenol B and C.

Snyder Scott A SA Brill Zachary G ZG

Organic letters 20110926 20

Chemical syntheses of two stereochemically unique resveratrol dimers, caraphenols B and C, have shown that their structures are misassigned. Thoughts on their potential chemical etiology led to an alternate structural proposal that has been confirmed through synthesis, one indicating that the substituents on their respective indane systems exist in a relative trans,trans orientation rather than the originally postulated all-cis arrangement. ...[more]

PMID: 21942557

Similar Datasets

Total synthesis and structural revision of engelhardione.

Project description:The total synthesis of the macrocyclic natural product engelhardione is reported. This effort led to the structural revision of the published structure of engelhardione to that of pterocarine. The revision reflects the change of the substitution pattern of one phenyl ether ring from the meta to the para position. To confirm, pterocarine (2) and its close regioisomer 3 were subsequently synthesized for comparison. Moreover, to the best of our knowledge, our synthesis of 1 represents the first example of a 14-membered macrocyclic diarylheptanoid with a meta-meta substitution pattern at the diphenyl ether moiety.

| S-EPMC3171739 | biostudies-literature

Total synthesis and structural revision of lucentamycin A.

Project description:Lucentamycin A is a marine-derived peptide natural product harboring a unique 4-ethylidene-3-methylproline (Emp) subunit. The proposed structure of lucentamycin A and the core Emp residue have recently been called into question through synthesis. Here, we report the first total synthesis of lucentamycin A, which confirms that the ethylidene substituent in Emp bears an E geometry, in contrast to the originally assigned Z configuration. Synthesis of the desired (E)-Emp subunit required the implementation of a novel strategy starting from Garner's aldehyde.

| S-EPMC5525334 | biostudies-literature

Total synthesis and structural revision of biyouyanagin B.

Project description: Not available

| S-EPMC3023179 | biostudies-literature

Enantioselective Total Synthesis and Structural Revision of Dysiherbol A.

Project description:A 12-step total synthesis of the natural product dysiherbol A, a strongly anti-inflammatory and anti-tumor avarane meroterpene isolated from the marine sponge Dysidea sp., was elaborated. As key steps, the synthesis features an enantioselective Cu-catalyzed 1,4-addition/enolate-trapping opening move, an Au-catalyzed double cyclization to build up the tetracyclic core-carbon skeleton, and a late installation of the C5-bridgehead methyl group via proton-induced cyclopropane opening associated with spontaneous cyclic ether formation. The obtained pentacyclic compound (corresponding to an anhydride of the originally suggested structure for dysiherbol A) showed identical spectroscopic data as the natural product, but an opposite molecular rotation. CD-spectroscopic measurements finally confirmed that both the constitution and the absolute configuration of the originally proposed structure of (+)-dysiherbol A need to be revised.

| S-EPMC8251742 | biostudies-literature

Total Synthesis and Structural Revision of Antibiotic CJ-16,264.

Project description:The total synthesis and structural revision of antibiotic CJ-16,264 is described. Starting with citronellal, the quest for the target molecule featured a novel bis-transannular Diels-Alder reaction that casted stereoselectively the decalin system and included the synthesis of six isomers before demystification of its true structure.

| S-EPMC4530996 | biostudies-literature

Dehydromicrosclerodermin B and Microsclerodermin J: Total Synthesis and Structural Revision.

Project description:The total synthesis of dehydromicrosclerodermin B and microsclerodermin J is described. Efficient approaches to the unusual amino acids in the target molecules were developed on the basis of a Negishi coupling (for Trp-2-CO2 H) and Blaise reaction (for Pyrr). An incorrect assignment of the pyrrolidinone stereochemistry of both compounds was confirmed by synthesizing epimers of the proposed structures. The spectroscopic data of these epimers were in complete agreement with those for the naturally derived material.

| S-EPMC5132153 | biostudies-literature

Total synthesis and structural revision of (+/-)-tricholomalides A and B.

Project description:The neurotrophic diterpenoids, tricholomalides A and B, were synthesized in a concise fashion. Key transformations include a ketene [2 + 2] cycloaddition and a Grignard-type reaction. In the course of the synthesis, it was determined that the structures of tricholomalides A and B had originally been misassigned.

| S-EPMC2756578 | biostudies-other

Total synthesis and structural revision of the piperarborenines via sequential cyclobutane C-H arylation.

Project description:A strategy for the construction of unsymmetrical cyclobutanes using C-H functionalization logic is demonstrated in the total synthesis of piperarborenine B and piperarborenine D (reported structure). These syntheses feature a new preparation of cis-cyclobutane dicarboxylates from commercially available coumalate starting materials and a divergent approach to the controlled cis or trans installation of the two distinct aryl rings found in the natural products using the first example of cyclobutane C-H arylation. The structure of piperarborenine D is reassigned to a head-to-head dimer, which was synthesized using an intramolecular [2+2] photocycloaddition strategy.

| S-EPMC3223735 | biostudies-literature

Total Synthesis and Structure Revision of Halioxepine.

Project description:The first total synthesis of halioxepine is accomplished using a 1,4-addition for constructing the quaternary center at C10 and a halo etherification for the generation of the tertiary ether at C7. The correct structure of halioxepine was determined by assembling different enantiomeric building blocks and by changing the relative configuration between C10 and C15.

| S-EPMC7898713 | biostudies-literature

Total synthesis of viridicatumtoxin B and analogues thereof: strategy evolution, structural revision, and biological evaluation.

Project description:The details of the total synthesis of viridicatumtoxin B (1) are described. Initial synthetic strategies toward this intriguing tetracycline antibiotic resulted in the development of key alkylation and Lewis acid-mediated spirocyclization reactions to form the hindered EF spirojunction, as well as Michael-Dieckmann reactions to set the A and C rings. The use of an aromatic A-ring substrate, however, was found to be unsuitable for the introduction of the requisite hydroxyl groups at carbons 4a and 12a. Applying these previous tactics, we developed stepwise approaches to oxidize carbons 12a and 4a based on enol- and enolate-based oxidations, respectively, the latter of which was accomplished after systematic investigations that revealed critical reactivity patterns. The herein described synthetic strategy resulted in the total synthesis of viridicatumtoxin B (1), which, in turn, formed the basis for the revision of its originally assigned structure. The developed chemistry facilitated the synthesis of a series of viridicatumtoxin analogues, which were evaluated against Gram-positive and Gram-negative bacterial strains, including drug-resistant pathogens, revealing the first structure-activity relationships within this structural type.

| S-EPMC4210137 | biostudies-literature

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data