Silylcuprates from Allene and Their Reaction with α,β-Unsaturatedd Nitriles and Imines. Synthesis of Silylated Oxo Compounds Leading to Cyclopentane and Cycloheptane Ring Formation
作者:Asunción Barbero、Yolanda Blanco、Francisco J. Pulido
DOI:10.1021/jo0509814
日期:2005.8.1
silylcupration of allenes and the subsequent capture of the intermediate cuprate with α,β-unsaturated nitriles is reported. The influence of the substitution of the nitrile, the nature of the silylcopper species, and the temperature on the selectivity of the reaction is studied. An interesting diaddition process was observed (1,2-addition and 1,4-addition), leading to oxo compounds which simultaneously have an allylsilane
Acid-Catalyzed Cyclization of Epoxyallylsilanes. An Unusual Rearrangement Cyclization Process
作者:Asunción Barbero、Pilar Castreño、Francisco J. Pulido
DOI:10.1021/ol035297v
日期:2003.10.1
synthesis of epoxyallylsilanes bearing the phenyldimethylsilyl group is reported that involves silylcupration of allene, conjugate addition to enones, and sulfur-ylide-mediated epoxidation. The Lewis acid-catalyzed cyclization of these substrates is presented. The expected normal products derived from 5-exo and/or 6-endo attack are not observed; instead, methylenecyclohexanols resulting from a tandem rea
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.
Barbero, Asuncion; Pulido, Francisco J., Synthesis, 2004, # 5, p. 779 - 785
作者:Barbero, Asuncion、Pulido, Francisco J.
DOI:——
日期:——
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.