A simple, facile and highly efficient one-pot synthesis of a pharmaceutically interesting diverse kind of functionalized 2-amino-4H-chromene is reported.
A novel highly water-dispersible and recoverable magnetite supported palladium–β-cyclodextrin complex as efficient catalyst in Suzuki–Miyaura and Sonogashira carbon–carbon coupling reactions.
Covalent organic frameworks (COFs), as highly porous crystalline structures, are newly emerging materials designed with tuneable features. They have a high potential to be a host to immobilize metal catalysts....
Covalent
organic frameworks (COFs) are emerging as a new class
of photoactive organic semiconductors, which possess crystalline ordered
structures and high surface areas. COFs can be tailor-made toward
specific (photocatalytic) applications, and the size and position
of their band gaps can be tuned by the choice of building blocks and
linkages. However, many types of building blocks are still unexplored
as photocatalytic moieties and the scope of reactions photocatalyzed
by COFs remains quite limited. In this work, we report the synthesis
and application of two bipyridine- or phenylpyridine-based COFs: TpBpyCOF and TpPpyCOF. Due to their good photocatalytic
properties, both materials were applied as metal-free photocatalysts
for the tandem aerobic oxidation/Povarov cyclization and α-oxidation
of N-aryl glycine derivatives, with the bipyridine-based TpBpyCOF exhibiting the highest activity. By expanding the
range of reactions that can be photocatalyzed by COFs, this work paves
the way toward the more widespread application of COFs as metal-free
heterogeneous photocatalysts as a convenient alternative for commonly
used homogeneous (metal-based) photocatalysts.
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