Synthesis of (<i>E</i>,<i>Z</i>)-1-Alkoxy-3-acyloxy-2-methylpenta-1,3-dienes via Danishefsky-Type Dienes or <i>O</i>-Acylation of Enones
作者:Sylvain Laclef、Claudia J. Exner、Maris Turks、Valeria Videtta、Pierre Vogel
DOI:10.1021/jo901878b
日期:2009.11.20
1-Alkoxy-2-methyl-3-acyloxy-(E,E)-penta-1,3-dienes have been prepared applying among others a modified Danishefsky's general method, including chiral, racemic, and achiral derivatives.
Homoallyl−Cyclopropylcarbinyl Cation Manifold. Trimethylsilyl versus Aryl Stabilization
作者:Xavier Creary、Benjamin D. O'Donnel、Marie Vervaeke
DOI:10.1021/jo062668n
日期:2007.4.1
E-trifluoroacetate (p-CH3) along with the E-substitution product. This isomerization suggests that the cyclized β-silyl cation can isomerize and then reopen to a classical aryl-stabilized cation. By way of contrast, B3LYP/6-31G* computational studies show only cyclized β-silyl cations as energy minima. Open kC cations are higher-energy nonminimum energy structures.