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Molecules 2012, 17(12), 13989-14001; doi:10.3390/molecules171213989

Synthesis and Insecticidal Activity of an Oxabicyclolactone and Novel Pyrethroids

1,* , 2, 2, 2, 2 and 2
1 Department of Chemistry, Federal University of Vicosa, Av. P. H. Rolfs, s/n, 36570-000, Vicosa, MG, Brazil 2 Department of Animal Biology, Federal University of Vicosa, Av. P. H. Rolfs, s/n, 36570-000, Vicosa, MG, Brazil
* Author to whom correspondence should be addressed.
Received: 18 October 2012 / Revised: 13 November 2012 / Accepted: 16 November 2012 / Published: 26 November 2012
(This article belongs to the Section Organic Synthesis)
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Deltamethrin, a member of the pyrethroids, one of the safest classes of pesticides, is among some of the most popular and widely used insecticides in the World. Our objective was to synthesize an oxabicyclolactone 6 and five novel pyrethroids 812 from readily available furfural and D-mannitol, respectively, and evaluate their biological activity against four insect species of economic importance namely A. obtectus, S. zeamais, A. monuste orseis, and P. americana. A concise and novel synthesis of 6,6-dimethyl-3-oxabicyclo[3.1.0]hexan-2-one (6) from furfural is described. Photochemical addition of isopropyl alcohol to furan-2(5H)-one afforded 4-(1'-hydroxy-1'-methylethyl)tetrahydro-furan-2-one (3). The alcohol 3 was directly converted into 4-(1'-bromo-1'-methylethyl)-tetrahydrofuran-2-one (5) in 50% yield by reaction with PBr3 and SiO2. The final step was performed by cyclization of 5 with potassium tert-butoxide in 40% yield. The novel pyrethroids 812 were prepared from methyl (1S,3S)-3-formyl-2,2-dimethylcyclopropane-1-carboxylate (7a) by reaction with five different aromatic phosphorous ylides. Compounds 612 presented high insecticidal activity, with 6 and 11 being the most active. Compound 6 killed 90% of S. zeamais and 100% of all the other insects evaluated. Compound 11 killed 100% of all insects tested.
Keywords: oxabicyclo; photochemistry; furfural; insecticide; pyrethroid oxabicyclo; photochemistry; furfural; insecticide; pyrethroid
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Alvarenga, E.S.; Carneiro, V.M.T.; Resende, G.C.; Picanço, M.C.; Farias, E.S.; Lopes, M.C. Synthesis and Insecticidal Activity of an Oxabicyclolactone and Novel Pyrethroids. Molecules 2012, 17, 13989-14001.

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