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. 2007 Jan 4;9(1):5-8.
doi: 10.1021/ol062017d.

Selective synthesis of (2Z,4E)-dienyl esters by ene-diene cross metathesis

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Selective synthesis of (2Z,4E)-dienyl esters by ene-diene cross metathesis

Gustavo Moura-Letts et al. Org Lett. .

Abstract

[reaction: see text] Cross metathesis of terminal alkenes with methyl (2Z,4E)-hexadienoate and related dienyl esters provides substituted (2Z,4E)-dienyl esters in good yields. Small-scale reactions are effectively promoted by the standard second-generation Grubbs-Hoveyda catalyst (GH-II), while a new fluorous GH-II catalyst is used for separation and recovery in gram-scale reactions. The transformation is featured in a rapid synthesis of the bottom fragments of the potent anticancer agents (-)-dictyostatin and 6-epi-dictyostatin.

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Figures

Figure 1
Figure 1
Structure of dictyostatin 1 and ene-diene cross metathesis approach to the (2E,4E)-dienyl ester fragment.
Figure 2
Figure 2
Structures of metathesis catalysts

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