We have recently disclosed an efficient and connective spiroannulation methodology that offers a rapid access to spirocyclic derivatives. This methodology has been expanded by the use of orthoesters containing a double bond, a versatile function that provides us with a wide range of useful transformations. Based upon these results, an original route towards Pentalenene has been devised. 

Use of orthoesters in the assembly of triquinanes: Towards the synthesis of <i>Pentalenene</i>

239th National Meeting (2010)

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Use of orthoesters in the assembly of triquinanes: Towards the synthesis of Pentalenene