Heterophanes are widely found in natural products and drug molecules. Herein, an efficient method for the construction of [2,5]-furanophanes with different ring types and ring sizes was developed. This method is carried out with furan-free precursor through intramolecular carbene-mediated alkynyl migration and tandem cyclization strategy. In addition, a series of tetrafuran structures can be obtained by oxidative coupling of the products.
A benzene-free synthesis of multisubstituted
catechol via an oxidative
dearomatic reorganization is reported. This reaction tolerated a wide
spectrum of functionalities, which could be applied in the synthesis
of an electron-deficient arene-conjugated catechol that is difficult
to access via biomimetic oxidative coupling. In addition, a diversification-oriented
transformation that leveraged the versatile catechol afforded a series
of functionality-rich products.
A catalytic stereodivergent intermolecular [5+2] cycloaddition of maltol-type oxidopyrylium through conjugative activation was reported, which featured high stereoselectivity, good compatibility and mild conditions, providing a convenient access to various seven-membered...
The dearomative functionalization of aromatic compounds represents a fascinating but challenging transformation, as it typically needs to overcome a great kinetic barrier. Here, a catalyst-free dearomative rearrangement of o-nitrophenyl alkyne is successfully established by leveraging the remote oxygen transposition and a weak N-O bond acceleration. This reaction features high atom-, step- and redox-economy, which provides a divergent entry to a series of biologically important benzazepines and bridged polycycloalkanones. The reaction is proposed to proceed through a tandem oxygen transfer cyclization/(3 + 2) cycloaddition/(homo-)hetero-Claisen rearrangement reaction. The resulting polycyclic system is richly decorated with transformable functionalities, such as carbonyl, imine and diene, which enables diversity-oriented synthesis of alkaloid-like polycyclic framework.
A series of Li[Ni0.8Co0.1Mn0.1]O2were synthesized with different [Ni0.8Co0.1Mn0.1](OH)2as precursors. Because the precursors were obtained via hydrothermal method at solutions with different ratios of ethanol and distilled water, they present different morphology in details. This phenomenon were inherited by the Li[Ni0.8Co0.1Mn0.1]O2. In addition, as-synthesized materials Li[Ni0.8Co0.1Mn0.1]O2perform distinct electrochemical properties as cathode materials in lithium-ion battery. The results indicate that more ethanol used in this work is effective to modify the surface structure of materials leading to better electrochemical properties. In addition, more ethanol in synthesis process could also improve the density of samples.
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