A palladium‐catalyzed highly stereoselective sulfonylation of vinylethylene carbonates for the precise synthesis of structurally diverse (Z)‐allylic sulfones was achieved with excellent regioselectivity and stereoselectivity (Z/E ratio, up to 99 : 1). This protocol used inexpensive sodium sulfinates as sulfonyl sources to construct valuable (Z)‐allylic sulfones in good to excellent yields. The controlling
novel three-component reaction of alkadienol, CO2, and aryl or vinylic halide gives a vinyl group-substituted cyclic carbonate in one pot in the presence of a catalytic amount of a palladium complex. 2,3-Alkadienol affords five-membered ring carbonate in good yield, while 3,4-alkadienol effects the six-membered one successfully. 2,4-Alkadienol also takes part in this reaction to provide five-membered
An efficient, one-pot protocol for the synthesis of highly functionalized cyclopentenols has been accomplished starting from vinylethylene carbonates and bissulfonylmethanes. This protocol proceeds via sequential palladium-catalyzed decarboxylative allylation and oxidative cyclization in an operationally simple manner. A wide range of substrates is well-accommodated to afford diverse cyclopentenols
从乙烯基碳酸乙烯酯和双磺酰甲烷开始,已经完成了一种用于合成高度官能化的环戊烯醇的有效的一锅法。该协议通过顺序钯催化脱羧烯丙基化和氧化环化以操作简单的方式进行。广泛的底物可以很好地适应各种环戊烯醇,以中等至良好的产率和优异的选择性。进一步的对照实验表明,可分离的 ( Z )-烯丙醇(高达Z / E = >19:1)的选择性形成是后续级联氧化环化成功的基础。
Synergistic Pd/Cu Catalyzed Allylation of Cyclic Ketimine Esters with Vinylethylene Carbonates: Enantioselective Construction of Trisubstituted Allylic 2
<i>H</i>
‐Pyrrole Derivatives
An asymmetric allylation of cyclic ketimine esters with vinylethylenecarbonates was accomplished through a Pd/Cu dual catalysis system under a mild condition, providing a range of trisubstituted allylic 2H-pyrrole analogues bearing a chiral quaternary stereogenic center in high yields (up to 92% yield) and with excellent regioselectivities and enantioselectivities (up to 96% ee). A gram-scale operation
Highly diastereo- and enantioselective synthesis of multisubstituted allylic amino acid derivatives by allylic alkylation of a chiral glycine-based nickel complex and vinylethylene carbonates
The asymmetric synthesis of multisubstituted allylic amino acid derivatives was accomplished by the allylicalkylation of a chiral glycine-based nickel complex with vinylethylene carbonates. High enantioselectivities and diastereoselectivities were obtained under mild reaction conditions. The gram-scale synthesis was carried out with a good yield and high enantioselectivity, indicating that the method