Incubation of [6-H-2]FPP (14a) with epicubenol synthase isolated from Streptomyces sp. LL-B7 gave epicubenol (1c) labeled at D-9 as established by 2H NMR. These results confirm the involvement of a predicted 1,2-hydride shift in the mechanism of formation of 1.
Incubation of [6-H-2]FPP (14a) with epicubenol synthase isolated from Streptomyces sp. LL-B7 gave epicubenol (1c) labeled at D-9 as established by 2H NMR. These results confirm the involvement of a predicted 1,2-hydride shift in the mechanism of formation of 1.
Effect of Isotopically Sensitive Branching on Product Distribution for Pentalenene Synthase: Support for a Mechanism Predicted by Quantum Chemistry
作者:Liansuo Zu、Meimei Xu、Michael W. Lodewyk、David E. Cane、Reuben J. Peters、Dean J. Tantillo
DOI:10.1021/ja3043245
日期:2012.7.18
Mechanistic proposals for the carbocation cascade reaction leading to the tricyclic sesquiterpene pentalenene are assessed in light of the results of isotopically sensitive branching experiments with the H309A mutant of pentalenene synthase. These experimental results support a mechanism for pentalenene formation involving a 7-protoilludyl cation whose intermediacy was first predicted using quantum-chemical calculations.