Seven-membered rings, synthesis cycloaddition strategies

V. CYCLOADDITION STRATEGIES FOR SEVEN-MEMBERED RING SYNTHESIS... 

CONTENTS The Synthesis of Seven-Membered-Rings General Strategies and the Design and Development of a New Class of Cycloaddition Reactions, Paul A. Wender and Jennifer A. Love. Recent Advances in Diels -Alder Cycloadditions of 2-Pyrones, Benjamin T. Woodard and Gary H. Posner. The Inter- and Intramolecular [4 + 4] Photocycloaddition of 2-Pyridones and Its Application to Natural Product Synthesis, Scott McN. Sieburth. 3 + 4 Annulations Between Rhodi- J s... 

THE SYNTHESIS OF SEVEN-MEMBERED RINGS GENERAL STRATEGIES AND THE DESIGN AND DEVELOPMENT OF A NEW CLASS OF CYCLOADDITION REACTIONS... 

The [5 + 2] cycloaddition was used in a synthesis of core stmcture of the cyathane diterpenes 11.146, tricyclic compounds that promote nerve growth factor (Scheme 11.50). The synthetic strategy revolved around using the cycloaddition of vinyl cyclopropane 11.147 to create the six- and seven-membered rings in a single step. 

---