Ketenimines from Isocyanides and Allyl Carbonates: Palladium-Catalyzed Synthesis of β,γ-Unsaturated Amides and Tetrazoles
作者:Guanyinsheng Qiu、Mathias Mamboury、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201609034
日期:2016.12.5
allyl ethyl carbonates with isocyanides in the presence of a catalytic amount of Pd(OAc)2 provided ketenimines through β‐hydride elimination of the allyl imidoylpalladium intermediates. The insertion of the isocyanide into the π‐allyl Pd complex proceeded via an unusual η1‐allyl Pd species. The resulting ketenimines were hydrolyzed to β,γ‐unsaturated carboxamides during purification by flash column chromatography
在催化量的Pd(OAc)2存在下,碳酸烯丙乙酯与异氰酸酯的反应通过烯丙基酰亚胺基钯中间体的β-氢化物消除,提供了烯酮胺。胩的插入π烯丙基钯配合物经由一个不寻常的η进行1 -烯丙基钯物种。在硅胶上通过快速柱色谱纯化时,将得到的酮亚胺水解成β,γ-不饱和羧酰胺,或与酸或三甲基叠氮化硅通过[3 + 2]环加成反应原位转化为1,5-二取代四唑。