Isocyclic Allylsilanes: An Efficient One-Pot Synthesis of Allylic Hydroxymethyl Methylenecycloalkane Building Blocks by a Controlled H-ene/Protodesilylation Sequence Using Two Different Lewis Acids
作者:Honoré Monti、Michel Féraud
DOI:10.1080/00397919608002611
日期:1996.5
An efficient one-pot synthesis of useful allylic hydroxymethyl methylenecycloalkane building blocks was achieved by a controlled H-ene / protodesilylation sequence using two different Lewis acids (Me(2)AlCl / SnCl4) and starting from readily available isocyclic allylsilanes.
Chemo- and regioselectivity in the Lewis acid-induced reaction of sterically unhindered isocyclic allylsilanes with 3-butyn-2-one
The primordial influence of the ring size in the Lewis acid-promoted reaction of stericallyunhinderedisocyclicallylsilanes with 3-butyn-2-one is reported. In all the cases, the classical Sakurai-Hosomi reaction is, for the most part or fully, suppressed. With cyclohexanic frameworks, allyltrimethylsilanes like 1a-c afford mainly or solely H-ene components. This chemoselectivity is quite different