Straightforward Synthesis of α,β-Unsaturated Thioesters via Ruthenium-Catalyzed Olefin Cross-Metathesis with Thioacrylate
作者:Anthoni W. van Zijl、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/jo800879e
日期:2008.7.1
The cross-metathesisreaction of S-ethyl thioacrylate with a variety of olefins is effectively catalyzed by using a ruthenium benzylidene olefin metathesis catalyst. This reaction provides a convenient and versatile route to substituted α,β-unsaturated thioesters, key building blocks in organic synthesis.
Nucleophilic Catalysis via Phosphine Conjugate Addition: Vinyl Sulfones as Reacting Partners in Catalytic Cross-Michael Cycloisomerization
作者:Michael J. Krische、Ana Liza Luis
DOI:10.1055/s-2004-831191
日期:——
Vinylsulfones serve as highly effective reacting partners in tributylphosphine catalyzed cross-Michael cycloisomerization. In all cases examined, the vinylsulfone moiety exclusively serves as the Michael acceptor to provide 5- and 6-membered ring products as single constitutional isomers in good to excellent yields.
Intramolecular Baylis−Hillman and Morita Reactions Using Unsaturated Thiol Ester Substrates Containing Enolizable Aldehydes
作者:Gary E. Keck、Dennie S. Welch
DOI:10.1021/ol026638s
日期:2002.10.1
[reaction: see text] Previously unknown intramolecular Baylis-Hillman and Morita reactions involving cyclization of an unsaturated thiolester onto a pendant aldehyde function are reported. These can be used successfully for the preparation of both cyclopentenols and cyclohexenols, but the results are very sensitive to substrate and precise reaction conditions.