Synthesis of Multicyclic β-Lactam Derivatives via Solid-Phase-Generated Ketenes

Recent developments in the synthesis of condensed β-lactams

β-Lactams are important heterocycles with diverse pharmacological profiles and have emerged as useful organic synthons.

The stereoselective formation of β-lactams with acyl ketenes generated from 5-acyl-Meldrum's acids

Acyl ketenes formed during thermal decomposition of 5-acyl-2,2-dimethyl-1,3-dioxa-4,6-diones undergo stereoselective [2+2] cycloaddition to chiral aldimines.

Very efficient and broad-in-scope palladium-catalyzed Hiyama cross-coupling. The role of water and copper(i) salts

A very high-yielding Pd-catalyzed cross-coupling between aryl halides and aryl(trialkoxy)silanes is achieved in the presence of Cu(i) and a measured amount of water.

Palladium-catalyzed cross-coupling reactions of arylsiloxanes with aryl halides: application to solid-supported organic synthesis

The solid-phase version of the Pd-catalyzed Hiyama reaction between a variety of aryltriethoxysilanes and immobilized aryl halides was developed. Smooth cross-coupling was achieved to afford the corresponding biaryl products in moderate to excellent yields. The described protocol would be particularly useful for the construction of 4'-substituted 1,1'-biphenyl derivatives.