Access to α-Pyrazole and α-Triazole Derivatives of Ketones from Oxidative Heteroarylation of Silyl Enolethers
作者:Sandeep Dhanju、Aidan C. Caravana、Regan J. Thomson
DOI:10.1021/acs.orglett.0c03005
日期:2020.10.16
The synthesis of α-pyrazole and α-triazole derivatives of ketones by the ceric ammonium nitrate-mediated oxidative coupling of enolsilanes with heteroarenes is reported. The reaction proceeds under mild reaction conditions to provide a diversity of products, including sterically hindered fully substituted derivatives.
Asymmetric Oxidation of Enol Derivatives to α-Alkoxy Carbonyls Using Iminium Salt Catalysts: A Synthetic and Computational Study
作者:Philip C. Bulman Page、Saud M. Almutairi、Yohan Chan、G. Richard Stephenson、Yannick Gama、Ross L. Goodyear、Alice Douteau、Steven M. Allin、Garth A. Jones
DOI:10.1021/acs.joc.8b02354
日期:2019.1.18
We report herein the first examples of asymmetricoxidation of enol ether and ester substrates using iminium salt organocatalysis, affording moderate to excellent enantioselectivities of up to 98% ee for tetralone-derived substrates in the α-hydroxyketone products. A comprehensive density functional theory study was undertaken to interpret the competing diastereoisomeric transition states in this example
Highly Diastereoselective Construction of Fused Carbocycles from Cyclopropane-1,1-dicarboxylates and Cyclic Enol Silyl Ethers: Scope, Mechanism, and Origin of Diastereoselectivity
By selecting the appropriate substituents on the ester and silyl groups, fused cyclopentane derivatives with multiple contiguous stereocenters can be synthesized with excellent diastereoselectivity through CuII/bisoxazoline‐catalyzed intermolecular [3+2] cycloaddition reactions of cyclopropane‐1,1‐dicarboxylates and cyclicenolsilylethers (see scheme).
正确的环丙烷环:通过在酯和甲硅烷基上选择合适的取代基,可以通过Cu II /双恶唑啉催化的环丙烷-1,1的分子间[3 + 2]环加成反应,合成具有多个非连续立体中心的稠合环戊烷衍生物。-二羧酸盐和环状烯醇甲硅烷基醚(参见方案)。
10.1021/acs.orglett.4c01512
作者:Zhu, Shijie、Tian, Xue、Li, Shi-Wu
DOI:10.1021/acs.orglett.4c01512
日期:——
Silyl enolethers react with bicyclo[1.1.0]butanes (BCBs) through Yb(OTf)3-promoted formal [2π + 2σ] cycloaddition reactions to furnish bicyclo[2.1.1]hexanes (BCHs). This new reaction tolerated a wide range of enol silyl ethers and BCBs. Furthermore, the amplification experiments and synthetic transformations of the cycloaddition compounds further highlighted their practicality.