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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 44, 2014 - Issue 13
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Original Articles

Concise Synthesis of (3Z)-Dodecen-12-olide, Pheromone Component of the Emerald Ash Borer

, , &
Pages 1957-1969 | Received 08 Nov 2013, Published online: 29 May 2014
 

Abstract

Emerald ash borer (EAB), Agrilus planipennis Fairmaire, is an invasive insect that has killed millions of ash trees in Canada and the USA. (3Z)-Dodecen-12-olide is a known female-produced pheromone of this insect, and a concise, three-step synthesis of a 2:1 blend of (3Z)-dodecen-12-olide and (3E)-dodecen-12-olide starting from commercially available (2-carboxyethyl)triphenylphosphonium bromide and 10-bromo-1-decene is described. The key steps in this synthesis are a lithium-salt-free Wittig reaction and an intramolecular SN2 esterification. Both of these macrocyclic lactones are behaviorally active toward EAB, and the 2:1 blend whose synthesis is described here has the potential to be a detection agent, mating disruptor, or mass trapping agent, which could be used in the control of EAB.

GRAPHICAL ABSTRACT

ACKNOWLEDGMENT

We thank Matt Brophy for technical assistance.

Notes

a See Experimental section for in situ formation of 25a and subsequent Wittig reaction in 1,2-DME.

b EtOH was removed in vacuo after formation of 25a was complete, and THF was added as the solvent for the subsequent Wittig reaction.

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