Synthesis of Morpholine‐Based Analogues of (−)‐Zampanolide and Their Biological Activity
作者:Christian Paul Bold、Melanie Gut、Jasmine Schürmann、Daniel Lucena‐Agell、Jürg Gertsch、José Fernando Díaz、Karl‐Heinz Altmann
DOI:10.1002/chem.202003996
日期:2021.4
We describe the convergent synthesis of three prototypical examples of a new class of analogues of the complex, cytotoxicmarine macrolide (−)‐zampanolide that incorporate an embedded N‐substituted morpholine moiety in place of the natural tetrahydropyran ring. The final construction of the macrolactone core was based on a high‐yielding intramolecular HWE olefination, while the hemiaminal‐linked side
Aluminum oxide-induced gas-phase ring-opening in methyl substituted gem-difluorocyclopropanes, leading to 2-fluorobuta-1,3-dienes and vinylacetylenes
作者:N. V. Volchkov、M. B. Lipkind、M. A. Novikov、O. M. Nefedov
DOI:10.1007/s11172-015-0914-6
日期:2015.3
A gas-phase pyrolysis of methyl-substituted gem-difluorocyclopropanes in a flow-tube reactor in the presence of Al2O3 at 185—250 °C gives 2-fluorobuta-1,3-dienes and vinylacetylenes.
在流管反应器中,在 Al2O3 存在下,在 185-250 °C 下,甲基取代的偕二氟环丙烷的气相热解得到 2-氟丁-1,3-二烯和乙烯基乙炔。
Reactions of Cobaloxime Anions and/or Hydrides with Enynes as a New, General Route to 1,3- and 1,2-Dienylcobaloxime Complexes
作者:Heather L. Stokes、Mark E. Welker
DOI:10.1021/om960058f
日期:1996.5.28
A new method for the preparation of dienylcobaloxime complexes which involves reactions of cobaloxime anions and/or hydrides with enynes is reported. This new dienyl complex preparative method leads to cobalt-substituted 1,3- or 1,2-dienes depending on the enyne substitution pattern chosen. Subsequent Diels−Alder reactions of the 1,3-dienyl complexes and demetalation reactions of cobalt-substituted
Efficient Syntheses of Cyclopropylacetylene, a Crucial Synthetic Intermediate for Efavirenz (DMP-266)
作者:Shaun E. Schmidt、Ralph N. Salvatore、Kyung Woon Jung、Taesoo Kwon
DOI:10.1055/s-1999-2985
日期:1999.12
Efficient syntheses of cyclopropylacetylene were achieved from cyclopropyl methyl ketone. Different reaction pathways were investigated to avoid the concomitant formation of any side products.
从环丙基甲基酮高效合成环丙基乙炔。研究了不同的反应路径,以避免同时形成任何副产品。
Spectroscopy and Photochemistry of Triplet 1,3-Dimethylpropynylidene (MeC<sub>3</sub>Me)
作者:Stephanie N. Knezz、Terese A. Waltz、Benjamin C. Haenni、Nicola J. Burrmann、Robert J. McMahon
DOI:10.1021/jacs.6b07444
日期:2016.9.28
unsymmetrical equilibrium structure for triplet MeC3Me ((3)3), but they also reveal a very shallow potential energy surface. The experimental IR spectrum of triplet MeC3Me ((3)3) is best interpreted in terms of a quasilinear, axially symmetric structure. EPR spectra yield zero-field splitting parameters that are typical for triplet carbenes with axial symmetry (|D/hc| = 0.63 cm(-1), |E/hc| = ∼ 0 cm(-1))