No abstract

Metal−organic framework (MOF)-supported metal nanoparticles (NPs) have been proven to be highly efficient in catalytic fields. In this work, palladium NPs were rationally confined in a MOF [Cu I 4 resorcin[4]arene ligand) to produce catalyst 1. The as-prepared catalyst 1 was characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma optical atomic emission spectrometry, and transmission electron microscopy. The characteristic results indicated that Pd NPs were welldispersed in catalyst 1, with a mean particle size of 3.02 nm. Remarkably, catalyst 1 exhibited a high catalytic efficiency for the tandem reactions of NH 3 BH 3 dehydrogenation and nitroarene hydrogenation. Most strikingly, catalyst 1 still featured high catalytic activity after five cycles of reuse.

Here we report the sulfinylsulfonation of alkynes to afford β-sulfinyl alkenylsulfone products with a broad substrate scope, excellent functional group compatibility, and high yield. Moreover, the sulfinylsulfonation reaction of enyne can also be realized for constructing functionalized carbo-and heterocycles through a radical cascade cyclization process.

A novel tandem formal [5 + 1]/hemiaminalization reaction based on the readily available (2-aminoaryl)divinyl ketones and various nucleophiles has been developed. The reaction represents a highly efficient and convenient methodology for the synthesis of 3,4-benzomorphan derivatives with high diastereoselectivity, and three new bonds and two rings are successively formed in one step under mild, metal-free conditions.

An efficient solvent-dependent regioselective [3 + 2]-cycloaddition/iodocyclization cascade reaction of alkyne-tethered chalcones/cinnamates and TosMIC has been developed. The reaction represents a novel protocol for the expedient and divergent one-pot synthesis of benz[e]indoles and spiro[indene-1,3'-pyrroles] from acyclic common precursors at room temperature.