Pyrolysis of azetidinone derivatives: a versatile route towards electron-rich alkenes, C-1 allylation and/or homologation of aldehydes
作者:Nouf S. Al-Hamdan、Osama M. Habib、Yehia A. Ibrahim、Nouria A. Al-Awadi、Osman M. E. El-Dusouqui
DOI:10.1039/c4ra01024h
日期:——
β-thiolactams led essentially to stereoselective synthesis of the high energy electron-rich Z-alkenes. Extension of this methodology to the pyrolysis of 3-allyloxy derivatives gave a simple direct route to the synthetically important 4-pentenal. These pyrolytic transformations convert aldehydes to aryloxyalkenes (a protected homologation) and 4-pentenal (a C-1 allylation and homologation). The starting
A highly diastereoselective synthesis of trans-2-substituted cyclopentylamines via a tandem hydrozirconation/Lewis acid-mediated cyclization sequence applied to butenyl oxazolidines is described. The method allows an easy preparation of diversely substituted cyclopentylamines which appear to be useful synthetic intermediates. This was further illustrated by the syntheses of (±)-Rodocaine, (±)-trans-pentacin
Forbes, Craig P.; Schoeman, Wentzel J.; Strauss, Heinrich F., Journal of the Chemical Society. Perkin transactions I, 1980, p. 906 - 910
作者:Forbes, Craig P.、Schoeman, Wentzel J.、Strauss, Heinrich F.、Venter, Elize M. M.、Wenteler, George L.、Wiechers, Adriaan
DOI:——
日期:——
Sequential Hydrozirconation/Cyclization of Dienes, a New Route toward <i>Trans</i> 2-Substituted Vinylcyclopentanes
作者:Sébastien Clergue、Jean-Luc Vasse
DOI:10.1021/ol500400s
日期:2014.3.7
The diastereoselective synthesis of trans-2-substituted vinylcyclopentanes is described. The method is based on the intramolecular coupling of 7-methoxy-1,5-dienes involving a sequential activation of the C═C double bonds via hydrozirconation and TMSOTf-promoted allylation.