Synthesis of spiro-pyridopyridine analogues by Grubbs' catalyst mediated alkene and enyne metathesis reaction

A synergistic approach to polycyclics via a strategic utilization of Claisen rearrangement and olefin metathesis

Olefin metathesis promoted by a well-defined metal carbene complex has evolved into an efficient method for the construction of a broad range of carbocyclic and heterocyclic rings of varying size. The synthetic potential of the olefin metathesis has been further increased by combining various other C-C bond forming processes either in tandem or in sequence. Herein, application of Claisen rearrangement and olefin metathesis to prepare various intricate and/or biologically important targets has been described.

Concise strategy for the synthesis of eleven-membered and ansa-bridged thirteen-membered lactone macrolides by ring-closing metathesis reaction

The eleven-membered macrolides and thirteen-membered ansa-bridged macrolides have been synthesized successfully by ring-closing metathesis reaction in the absence of the additive Ti(OiPr)4, which is essential for the metathesis reaction of the ester precursors.