1-Bromo-2-(diphenylphosphinoyl)ethyne and 1-bromo-2-(p-tolylsulfinyl)ethyne: versatile reagents eventually leading to benzocyclotrimers
作者:Pierluigi Padovan、Stefano Tartaggia、Silvia Lorenzon、Enrico Rosso、Cristiano Zonta、Ottorino De Lucchi、Fabrizio Fabris
DOI:10.1016/j.tetlet.2009.02.064
日期:2009.4
The title compounds form Diels-Alder cycloadducts with a number of dienes, which can be transformed into vic-bromo(trimethylstannyl)olefins, ultimate precursors for the synthesis of benzocyclotrimers via copper-mediated cyclotrimerization. The overall result is a formal condensation of three diatomic carbons with three dienes. (C) 2009 Elsevier Ltd. All rights reserved.
Introduction of functionalized substituents into active methylene compounds
作者:Isaburo Hori、Takeshi Oishi
DOI:10.1016/s0040-4039(01)86511-4
日期:1979.1
Condensation of active methylene compounds with variously functionalized carbon two unit Michael acceptors (–) afforded the corresponding adducts, respectively. Reaction of such Michael adducts with NBS to afford the vinyl (, , and ) and ethynyl () bromides will also be described.