Under irradiation (tungsten lamp), the palladium-catalysed three-component cross-coupling reaction between iodoalkenes such as 6-iodo-1-hexene or their derivatives, carbon monoxide (1 atm) and 9-alkyl- or 9-aryl-9-BBN derivatives (9-BBN = 9-borabicyclo[3.3.1]nonane) produces unsymmetrical ketones in moderate to high yields; the oxidative addition of iodoalkenes to a palladium(0) complex proceeds via a radical process, thus allowing cyclization of the iodoalkenes to five-membered rings prior to the couplings with carbon monoxide and boron reagents.
在照射(
钨灯)下,
碘烯,如
6-碘-1-己烯或其衍
生物,与
一氧化碳(1 atm)和9-烷基或9-芳基-9-BBN衍
生物(9-BBN =
9-硼双环[3.3.1]壬烷)在
钯催化下进行三组分交叉耦合反应,产生中等至高产率的不对称酮;
碘烯对
钯(0)配合物的氧化加成通过自由基过程进行,从而允许
碘烯在与
一氧化碳和硼试剂耦合之前先环化为五元环。