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. Author manuscript; available in PMC: 2013 Mar 14.
Published in final edited form as: Chem Rev. 2011 Oct 21;112(3):1681–1709. doi: 10.1021/cr200073d

Scheme 8.

Scheme 8

Casbene (55), a diterpene produced from geranylgeranyl pyrophosphate (53) by casbene synthase, is the likely intermediate for the ingenane (56), tigliane (57), and lathyrane (58) families of diterpenoid natural products.