Most complex prime links exhibit inherent topological chirality, yet their high stereoinduction remains a rare occurrence. Here, we present a protocol for the stereoselective synthesis of a molecular link comprising two triple entwined rings. We describe steps for constructing the precursor circular helicate, performing ring closure metathesis, and demetallation. We also outline procedures for bio-beads separation and data analysis. This protocol holds promise for applications in molecular nanotopology. For complete details on the use and execution of this protocol, please refer to Zhang et al. (2022)..
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http://dx.doi.org/10.1016/j.xpro.2023.102821 | DOI Listing |
Int J Mol Sci
December 2024
Materials Research Institute, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico.
Since its conceptualization, click chemistry in all its variants has proven to be a superior synthesis protocol, compared to conventional methods, for forming new covalent bonds under mild conditions, orthogonally, and with high yields. If a term like reactive resilience could be established, click reactions would be good examples, as they perform better under increasingly challenging conditions. Particularly, highly hindered couplings that perform poorly with conventional chemistry protocols-such as those used to conjugate biomacromolecules (e.
View Article and Find Full Text PDFNat Commun
January 2025
The Institute for Advanced Studies and Hongyi Honor College, Wuhan University, Wuhan, China.
Optically pure 1,2-diols and 1,3-diols are the most privileged structural motifs, widely present in natural products, pharmaceuticals and chiral auxiliaries or ligands. However, their synthesis relies on the use of toxic or expensive metal catalysts or suffer from low regioselectivity. Catalytic asymmetric synthesis of optically pure 1,n-diols from bulk chemicals in a highly stereoselective and atom-economical manner remains a formidable challenge.
View Article and Find Full Text PDFChemistry
January 2025
Department of Natural Sciences, The Open University of Israel, Ra'anana 4353701, Israel.
The development of new protocols for stereospecific and stereoselective halogenation transformations by mild reaction conditions is a highly desirable research target for the chemical and pharmaceutical industries. Following the straightforward methodology for directly transforming a wide scope of alcohols to alkyl bromides and chlorides using substoichiometric amounts of thioureas and N-halo succinimides (NXS) as a halogen source in a single step, we noticed that in apolar solvents bromination of chiral secondary alcohols did not produce the expected racemates. In this study, the stereochemical aspects of the bromination reaction were examined.
View Article and Find Full Text PDFOrg Lett
January 2025
Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
Org Lett
January 2025
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China.
A Ni-catalyzed protocol for the regioselective and stereoselective three-component fluoroalkylthiolation of alkynes with fluoroalkyl halides and thiosulfonates is presented. This reductive difunctionalization provides an efficient strategy for the rapid construction of fluoroalkyl-incorporated vinylthioethers under mild conditions in moderate to good yields.
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