Synthesis of 4,4-Dimethyl-1,6-heptadiyne and Other Neopentylene-Tethered (NPT) 1,6-Diynes
作者:Amir Tavakoli、Gregory B. Dudley
DOI:10.1021/acs.joc.2c00110
日期:2022.5.6
target-oriented synthesis. Ring-opening fragmentation of dimedone (and alkylation) produces alkyne-tethered β-keto esters 6. One-pot dehydration with optional saponification produces diyne monoester 15 or monoacid 3, which can be further functionalized using traditional alkyne substitution chemistry and/or carboxylate manipulations. For example, copper-catalyzed decarboxylation of acid 3 provides 4,4-dimethyl-1
Synthesis of Coprinol and Several Alcyopterosin Sesquiterpenes by Regioselective [2 + 2 + 2] Alkyne Cyclotrimerization
作者:Amir Tavakoli、Gregory B. Dudley
DOI:10.1021/acs.joc.2c01741
日期:2022.11.4
Alkyne [2 + 2 + 2] cyclotrimerization is a strategically attractive but tactically challenging approach to the synthesis of highly substituted benzene rings. Here, a bimolecular regioselective cyclotrimerization is applied to the total synthesis of the natural product coprinol and several related alcyopterosins from the illudalane family of sesquiterpenes. The synthesis of coprinol from dimedone was
Synthesis of 4,4-Dimethyl-1,6-heptadiyne and Alcyopterosin O
作者:Amir Tavakoli、Gregory B. Dudley
DOI:10.1021/acs.orglett.0c03356
日期:2020.11.20
A four-step synthesis of 4,4-dimethyl-1,6-heptadiyne and an associated five-step synthesis of alcyopterosin O, an illudalane sesquiterpene natural product, are described starting from commercially available dimedone. The process features C-C bond-cleaving fragmentation and elimination methods for making alkynes, and it proceeds by way of nonsymmetrical diynes that are themselves valuable synthetic building blocks, as exemplified by the synthesis of alcyopterosin O.
Collective Synthesis of Illudalane Sesquiterpenes via Cascade Inverse Electron Demand (4 + 2) Cycloadditions of Thiophene <i>S</i>,<i>S</i>-Dioxides
作者:Kun Ho Kenny Park、Nils Frank、Fernanda Duarte、Edward A. Anderson
DOI:10.1021/jacs.2c03304
日期:2022.6.8
dienophiles in this inverseelectrondemand Diels–Alder cascade, this concise and convergent approach enables the synthesis of these targets in as little as five steps. Theoretical studies rationalize the reactivity of thiophene S,S-dioxides with both electron-poor and electron-rich dienophiles and reveal reaction pathways involving either nonpolar pericyclic or bifurcating ambimodal cycloadditions. Overall,