Chelation-Controlled Intermolecular Alkene and Alkyne Hydroacylation: The Utility of β-Thioacetal Aldehydes
作者:Michael C. Willis、Helen E. Randell-Sly、Robert L. Woodward、Gordon S. Currie
DOI:10.1021/ol050638l
日期:2005.5.1
beta-Thioacetal-substituted aldehydes, which are conveniently prepared from the corresponding ynals, can be combined with a range of alkynes or electron-poor alkenes to deliver intermolecular hydroacylation adducts. The reactions employ [Rh(dppe)]ClO4 as a catalyst and are proposed to proceed via a chelated rhodium acyl intermediate. The thioacetal-containing products can be deprotected to the corresponding ketones or reduced to alkanes in good yields.
Rhodium-Catalyzed Intermolecular Chelation Controlled Alkene and Alkyne Hydroacylation: Synthetic Scope of β-<i>S</i>-Substituted Aldehyde Substrates
作者:Michael C. Willis、Helen E. Randell-Sly、Robert L. Woodward、Steven J. McNally、Gordon S. Currie
DOI:10.1021/jo060582o
日期:2006.7.1
The use of β-S-substituted aldehydes in rhodium-catalyzed intermolecularhydroacylation reactions is reported. Aldehydes substituted with either sulfide or thioacetal groups undergo efficient hydroacylation with a variety of electron-poor alkenes, such as enoates, in Stetter-like processes and with both electron-poor and neutral alkynes. In general, the reactions with electron-poor alkenes demonstrate
Replacing dichloroethane as a solvent for rhodium-catalysed intermolecular alkyne hydroacylation reactions: the utility of propylene carbonate
作者:Philip Lenden、Paul M. Ylioja、Carlos González-Rodríguez、David A. Entwistle、Michael C. Willis
DOI:10.1039/c1gc15293a
日期:——
Propylene
carbonate is an excellent solvent for rhodium-catalysed intermolecular alkyne hydroacylation reactions, allowing a variety of β-S-aldehydes and alkynes to be combined in high yields, to deliver enone products. The effective use of propylene carbonate removes the need to employ dichloroethane as solvent.