Stereoselective Reactions of (E,E)-2,3,6,7-Tetramethyl-1,8-Bis(trimethylsilyl)octa-2,6-diene with Aldehydes and Acyl Chlorides
作者:Chahinez Aouf、Douniazad El Abed、Malika Ibrahim-Ouali、Michel Giorgi、Maurice Santelli
DOI:10.1002/ejoc.200700137
日期:2007.7
The titanium tetrachloride mediated addition reaction of (E,E)-2,3,6,7-tetramethyl-1,8-bis(trimethylsilyl)octa-2,6-diene to aldehydes and acylchlorides is described. Aldehydes undergo simple allylation except p-anisaldehyde, which leads to cyclopentane resulting from double allylation. From acylchlorides, highly substituted meso cyclopentanols bearing 1,3-diquaternary carbon atoms separated by a
Dibromocarbene and bromofluorocarbene addition to substituted allylsilanes
作者:Chahinez Aouf、Maurice Santelli
DOI:10.1016/j.tetlet.2010.12.005
日期:2011.2
The dibromocarbene or bromofluorocarbene addition to substituted allyldisilanes afforded instable gem-dibromocyclopropanes or a gem-bromofluorocyclopropane, respectively. These gem-bromohalogenocyclopropanes undergo a spontaneous ring opening at room temperature to give halogenated dienylsilanes or bromo dienes or dibromotetraenes.
and efficient multicomponent reaction involving a double-allylation sequence is reported. In situ generated bimetallic reagents are prepared from disilane 1 and added onto a range of aliphatic aldehydes to afford a direct access to trisubstituted tetrahydrofurans in good to excellent diastereoselectivity (up to 70%).