- Transannular Diels-Alder reactions on 14-membered macrocyclic trienes. Part I: stereoselective syntheses of the macrocyclic trienes precursors
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Transannular Diels-Alder reactions on 14-membered macrocycles containing properly located diene and methyl-substituted dienophile units lead to A.B.C. tricycles related to steroids.To study the influence of the olefin and diene geometry on the stereochemical outcome of the Diels-Alder reaction it was necessary to prepare macrocyclic trienes of well-defined stereochemistry.Eight different types of macrocyclic trienes might be obtained by the coupling of appropriate dienophiles and dienes, namely, TTC, TTT, TCC, TCT, CTC, CTT, CCC, and CCT.In this paper (first in a series of two), the synthesis of appropriately functionalized dienophile and diene synthons, as well as their coupling reaction affording macrocyclic triene precursors, is described.
- Ndibwami, Alexis,Lamothe, Serge,Guay, Daniel,Plante, Raymond,Soucy, Pierre,et al.
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p. 695 - 713
(2007/10/02)
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- Synthesis and transannular Diels-Alder reaction of a 13-membered macrocyclic triene. A synthetic approach towards the tricyclic part A.B.C.[6.6.5] of the veratrum alkaloids
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The syntheses of the acyclic triene cis-trans-trans (3Z,9Z,11E)-13-chloro-3-methoxy-1,1,7,7-tetrakis(methoxycarbonyl)-4- methyltrideca-3,9,11-triene (25), and the corresponding trans-cis-trans (3Z,9E,11E) isomer 37, and trans-trans-trans (3Z,9E,11E) isomer, 46, are described. Compounds 25 and 37 furnished in good yield 13-membered macrocyclic compounds (3Z,9Z,11E)- and (3Z,9E,11Z)-3-methoxy-1,1,7,7-tetrakis(methoxycarbonyl)-4- methylcyclotride-ca-3,9,11-triene (26) and (38) which led to tricyclic compound (cis-anti-cis)-2-methoxy-4,4,11,11-tetrakis(methoxycarbonyl)-1- methyl-tricyclo[7.4.0.02,6]tridec-7-ene (27) by transannular Diels-Alder reaction. Macrocyclization of trans-trans-trans chloride 46 was not successful.
- Quimpere,Ruest,Deslongchamps
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p. 132 - 140
(2007/10/02)
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