Functionalised Allylsilanes from Silylcopper Reagents and Allene. A Useful Strategy for Cyclopentane Annulations
作者:Asuncion Barbero、Carlos Garcı&#x;a、Francisco J. Pulido
DOI:10.1016/s0040-4020(00)00129-0
日期:2000.4
allylsilane-containing divinyl ketones and oxoallylsilanes, respectively. They undergo highly stereocontrolled silicon-assisted intramolecular cyclizations when treated with protic or Lewis acid leading to cyclopentane ring-formation.
作者:Asunción Barbero、Pilar Castreño、Francisco J. Pulido
DOI:10.1021/ja051967b
日期:2005.6.1
A novel highly stereoselective spiro-cyclopropanation reaction from oxoallylsilanes is described. Oxoallylsilanes are readily obtained by silylcupration of allene followed by conjugate addition to enones. The former oxoallylsilanes undergo a tandem cyclization-cyclopropanation reaction when treated with CH2I2/Me3Al, leading to hydroxylated polycyclic systems bearing the spiro-cyclopropane moiety. The scope of the process is studied, and a feasible pathway is discussed.
Silylcupration of allenes followed by reaction with enones. A new strategy for the synthesis of methylenecyclopentanols
作者:Asunción Barbero、Carlos García、Francisco J. Pulido
DOI:10.1016/s0040-4039(99)01264-2
日期:1999.9
Silylcupration of allene using phenyldimethylsilyl-copper followed by conjugated addition to α,β-unsaturated ketones affords oxoallylsilanes with different substitution patterns. When the former oxoallylsilanes are treated with a Lewis acid they undergo highly stereoselective allylsilane terminated cyclization leading to mono-, bi-, and tricyclic methylenecyclopentanols.