The diterpenoid portion of the important anticancer drugTaxol (paclitaxel) 250 is formed from GGPP via the hydrocarbontaxadiene 247. Taxadiene synthase from Taxus speciescatalyses cyclization of GGPP to taxadiene and earlier studieshave indicated the mechanism involves ionization and cyclizationto a transient verticillyl intermediate 245, which is proposedto have the 11R configuration to allow intramoleculartransfer of the C-11 proton to C-7 to initiate transannular ringclosure to the taxenyl cation 246
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