A new, highly stereoselective approach to pyrrolidines via overall 5-endo-trig cyclisations of homoallylic tosylamides
作者:Andrew D. Jones、David W. Knight
DOI:10.1039/cc9960000915
日期:——
Iodocyclisations of E-homoallylic tosylamides 7 lead to excellent yields of either 2,5-trans-or 2,5-cis-3-iodopyrrolidines (10 or 11), depending upon the reaction conditions.
The hydration of β- and δ-hydroxy internal alkynes catalyzed by Hg(OTf)2 took place instantaneously to give ketones with complete regioselectivity under mild conditions, whereas the hydration of internal alkyne without hydroxy moiety was very slow and gave a mixture of ketones. If the hydroxy group is located more than five carbons from the triple bond it has no significant effect upon the hydration reaction.
First Total Synthesis of the Irciniasulfonic Acids
作者:Adrian P. Dobbs、Alberto Venturelli、Laura A. Butler、Robert J. Parker
DOI:10.1055/s-2005-862387
日期:——
A flexible and concise first total synthesis of the irciniasulfonic acids is reported.
报道了一种灵活而简洁的irciniasulfonic酸的全合成方法。
Synthesis of bis(indolyl)alkanes by a site-selective gold-catalyzed addition of indoles to butynol derivatives
作者:José Barluenga、Amadeo Fernández、Félix Rodríguez、Francisco J. Fañanás
DOI:10.1016/j.jorganchem.2008.09.059
日期:2009.2
A new site-selective hydroarylation reaction of alkynes catalyzed by gold complexes and directed by an internal hydroxyl group has been developed. Thus, the treatment of 3-butyn-1-ol derivatives with indoles and a catalytic amount of an in situ formed cationic gold complex leads to the formation of bis(indolyl)alkane derivatives. Particularly interesting is the reaction with terminal alkynes as the
New Volatile Sulfur-Containing Constituents in a Simultaneous Distillation−Extraction Extract of Red Bell Peppers (Capsicum annuum)
作者:Regula Naef、Alain Velluz、Alain Jaquier
DOI:10.1021/jf072493y
日期:2008.1.1
mercapto-alcohols 17, 18, and 30, the dithiols 19 and 28, the methylthio-thiols 20 and 21, and the thiophene-thiol 31) and the two new dithiolanes 10 and 29. All of them are structurally related to the unsaturated C7- and C9-ketones 1- 4. The free thiols were enriched using Affi-Gel 501 ( p-aminophenyl-mercuric acetate grafted on an agarose gel). The new compounds were confirmed by syntheses and were organoleptically