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Tocopherols, collectively known as vitamin E, are only synthesised in photosynthetic organisms. Tocopherol cyclase (TC) catalyses the formation of the chromanol headgroup of the various tocopherol isoforms. TCs from Arabidopsis and maize (Zea mays) were expressed in Escherichia coli and purified. Analysis of the enzymatic properties revealed similarities but also differences between the two enzymes...
The asymmetric synthesis of the stereoisomers of 7,11-dimethylheptadecane (1) and 7-methylheptadecane (2) via α-alkylation employing the SAMP/RAMP hydrazone method with high asymmetric induction and good overall yields is described. A mixture of (7S,11R)-1 and (S)-2 is the female-produced sex pheromone of the spring hemlock looper moth (Lambdina athasaria) and the pitch pine looper moth (Lambdina...
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