Syntheses of Cecropia Juvenile Hormones by Selective Side-chain Methylation of (<i>E</i>,<i>E</i>)-Farnesol

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  • Syntheses of cecropia juvenile hormones by selective side-chain methylation of (E,E)-farnesol.

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The stereoselective route to the title insect hormones (JH-1 & JH-2) depends crucially on the epoxidation of allylic alcohols with t-butyl hydroperoxide in the presence of oxobis(2,4-pentanedionato-O,O′)vanadium(IV). The oxidation of 2-methyl-1-hepten-3-ol exclusively produces the (2R*,3S*) isomerofthe diastereomeric epoxy alcohols. This is converted into (Z)-6-methyl-5-undecene by the sequence involving oxirane reaction with lithium dibutylcuprate(I) and the removal of both hydroxyl groups of the resulting 1,2-diol. Extension of the series of reactions to the mono- and bisoxirane derived from (E,E)-farnesol gives JH-2 and JH-1, respectively.

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