Cyclization to afford tricyclic ketone

Cinderella will walk you through the cyclization of 18 to afford tricyclic ketone 14.

For help with other syntheses, click the other princesses above!

 

 

Bian, M.; Wang, Z.; Xiong, X.; Sun, Y.; Matera, C.; Nicolaou, K. C.; Li, A. J. Am. Chem. Soc. 2012, 134, 8078-8081.