The C1-C6 region of the potent cytotoxic agent psymberin has been synthesized. The key transformations of the synthesis are an auxiliary-controlled addition of a Sn(II)-glycolate enolate to an aldehyde to yield the aldol product and transforming the primary alcohol into a terminal olefin utilizing organoselenium chemistry.
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http://dx.doi.org/10.1016/j.tetlet.2013.05.153 | DOI Listing |
Methods Mol Biol
January 2025
Instituto Cajal, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
In the Drosophila brain, neuronal diversity originates from approximately 100 neural stem cells, each dividing asymmetrically. Precise mapping of cell lineages at the single-cell resolution is crucial for understanding the mechanisms that direct neuronal specification. However, existing methods for high-resolution lineage tracing are notably time-consuming and labor-intensive.
View Article and Find Full Text PDFSoft Matter
January 2025
Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), School of Materials Science & Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.
Flexible two-dimensional nickel-cobalt metal-organic frameworks/graphene oxide/carbon nanotubes (2D NiCo-MOF/GO/CNTs) hybrid films have been designed and prepared as high-performance supercapacitor electrode materials vacuum filtration. The 2D NiCo-MOF nanosheets serve as the main source of capacitance for the hybrid films, while CNTs function as both the conductive network, enhancing the electrical conductivity of the MOFs, and the binder, linking the 2D NiCo-MOF nanosheets and GO. When the mass ratio of 2D NiCo-MOF, GO, and CNTs is 2 : 1 : 0.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo, Russia.
Directed synthesis of novel water-soluble asymmetric porphyrins containing in a molecule three cationic fragments and residues of adenine (PorAD) was performed, using metal-complex catalysis method. The interaction of the synthesized porphyrin with the oligonucleotides poly[d(AT)2] and poly[d(GC)2] and double-stranded deoxyribonucleic acid of the calf thymus (ctDNA) was studied by means of spectral and hydrodynamic methods. It was established that PorAD intercalated not only into GC-enriched regions, but also into AT regions.
View Article and Find Full Text PDFPlant Cell Rep
December 2024
Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China.
Transcription factor OsGRAS2 regulates salt stress tolerance and yield in rice. Plant-specific GRAS transcription factors are involved in many different aspects of plant growth and development, as well as in biotic and abiotic stress responses, although whether and how they participate in salt stress tolerance in rice (Oryza sativa) remains unclear. A screen of a previously generated set of activation-tagged lines revealed that Activation Tagging Line 63 (AC63) displayed a salt stress-sensitive phenotype.
View Article and Find Full Text PDFNat Commun
December 2024
Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, China.
Marine cyclopianes are a family of diterpenoid with novel carbon skeleton and diverse biological activities. Herein, we report our synthetic and chemical proteomics studies of cyclopiane diterpenes which culminate in the asymmetric total synthesis of conidiogenones C, K and 12β-hydroxy conidiogenone C, and identification of Immunity-related GTPase family M protein 1 (IRGM1) as a cellular target. Our asymmetric synthesis commences from Wieland-Miescher ketone and features a sequential intramolecular Pauson-Khand reaction and gold-catalyzed Nazarov cyclization to rapidly construct the 6-5-5-5 tetracyclic skeleton.
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