Stereocontrolled construction of 1,7-dimethyl A.B.C.[6.6.6] tricycles. Part II. Transannular Diels–Alder reaction of 14-membered macrocycles containing cis-dienophiles
Stereocontrolled construction of 1,7-dimethyl A.B.C.[6.6.6] tricycles. Part II. Transannular Diels–Alder reaction of 14-membered macrocycles containing cis-dienophiles
Theoretical and Experimental Determination of the Effects Governing the Transannular Diels−Alder Reaction of Trans−Trans−Cis Systems with or without Activation of the Dienophile
作者:Samuel Fortin、Louis Barriault、Yves L. Dory、Pierre Deslongchamps
DOI:10.1021/ja0109491
日期:2001.8.1
A thorough study of the transannularDiels-Alder (TADA) reaction of trans-trans-cis macrocyclic trienes was carried out. It led to a better understanding of various parameters that govern the TADA reaction in particular and the Diels-Alder reaction in general. Thus, carbonyl activation of the dienophile and substitution of the diene are discussed, as well as the presence of substituents on the macrocycle
对反-反-顺大环三烯的跨环狄尔斯-阿尔德(TADA)反应进行了深入研究。它有助于更好地了解控制 TADA 反应的各种参数,以及一般的 Diels-Alder 反应。因此,讨论了亲二烯体的羰基活化和二烯的取代,以及大环上取代基的存在及其在过渡态水平上的各自影响。
Increasing the Efficiency of the Transannular Diels−Alder Strategy via Stille Macrocyclizations
作者:Eric Marsault、Pierre Deslongchamps
DOI:10.1021/ol000209h
日期:2000.10.1
[GRAPHICS]To increase the potential and flexibility of the transannular Diels-Alder strategy to build tricycles and tetracycles, the synthesis of macrocyclic trienes of defined geometries has been approached via Stille macrocyclization, giving very high yield and purity of the desired macrocycles or tricycles.
Experimental and Semiempirical Calculation Studies of Transannular Diels-Alder and Other Competing Pericyclic Reactions
作者:Yves L. Dory、Pierre Soucy、Marc Drouin、Pierre Deslongchamps
DOI:10.1021/ja00106a060
日期:1995.1
Several related macrocyclic trienes have been found to interconvert thermally via [1,5]sigmatropic hydrogen shifts at the diene sites. These macrocyclic trienes further undergo thermal transannular Diels-Alder cycloaddition, thus yielding complex mixtures of adducts. This difficult problem has been tackled and qualitatively solved by means of the semiempirical methods AM1 and PM3. Most of the starting material ground states have been characterized as well as all the [1,5]sigmatropic hydrogen shift and Diels-Alder transition structures. The results of these calculations indicate that some [1,5]sigmatropic hydrogen shift enthalpies of activation are within the same range of most Diels-Alder enthalpies of activation. As a result the Curtin-Hammett principle does not apply for the entire system but only on limited regions. The method proved successful in uncovering the previously missassigned identity of one of the Diels-alder adducts: an unexpected 5-6-7-membered tricycle.