Indium(III) Chloride-Promoted Intramolecular Addition of Allylstannanes to Alkynes
摘要:
In the presence of an equimolar amount of InCl3, 8-tributylstannyl-6-octen-1-ynes (allylstannanes bearing an alkynyl group) were efficiently cyclized to 2-allyl-1-methylenecyclopentanes. In contrast, catalytic use of InCl3 gave 2-allyl-1-(tributylstannylmethylene)cyclopentanes mainly by intramolecular allylstannylation. These cyclizations could proceed via intramolecular addition of an allylindium intermediate.
Iron-catalyzed addition of Grignard reagents to activated vinyl cyclopropanes
作者:Benjamin D. Sherry、Alois Fürstner
DOI:10.1039/b918818e
日期:——
A highly regioselective iron-catalyzed addition of branched primary, secondary or tertiary alkyl Grignardreagents to activated vinyl cyclopropanes is described, which likely proceeds by a direct addition mechanism as opposed to single electron transfer or an iron-allyl based process.
Palladium-Catalyzed Carboxylation of Activated Vinylcyclopropanes with CO<sub>2</sub>
作者:Tsuyoshi Mita、Hiroyuki Tanaka、Yuki Higuchi、Yoshihiro Sato
DOI:10.1021/acs.orglett.6b01231
日期:2016.6.3
By using a palladium catalyst with ZnEt2, activated vinylcyclopropanes were successfully converted into the corresponding β,γ-unsaturated carboxylic acids in high yields under a CO2 atmosphere (1 atm). The intermediate in this reaction is thought to be a nucleophilic η1-allylethylpalladium species, which would be produced from π-allylpalladium and ZnEt2 (umpolung reactivity).