Metal-Catalyzed Dealkoxylative C<sub>aryl</sub>C sp 3 Cross-Coupling-Replacement of Aromatic Methoxy Groups of Aryl Ethers by Employing a Functionalized Nucleophile
The direct replacement of aromaticmethoxygroups with activated carbon nucleophiles would give rise to novel synthetic pathways for targeted and diversity‐oriented syntheses. We demonstrate here that this transformation can be achieved in a one‐step reaction involving a bifunctional organolithium nucleophile in combination with a CArOMe bond‐cleaving nickel catalyst. The resulting products are stable
A ruthenium-catalyzed [1,2]-Brook rearrangement involved dominosequence is presented to prepare highly functionalized silyloxy indenes with atomic- and step-economy. This domino reaction is triggered by acylsilane-directed C–H activation, and the aldehyde controlled the subsequent enol cyclization/Brook Rearrangement other than β–H elimination. The protocol tolerates a broad substitution pattern,
A ruthenium-catalyzed C–H alkenylation of aroylsilanes with electron-deficient alkenes was developed, using acylsilane as the directing group. The mild reaction conditions enable the tolerance of a wide scope of functionalities such as OMe, F, Cl, Br and CF3, providing a convenient and highly effective method for the synthesis of styrene derivatives bearing acylsilane. Steroid and heterocycles such
Brook Rearrangement as Trigger for Carbene Generation: Synthesis of Stereodefined and Fully Substituted Cyclobutenes
作者:Fa-Guang Zhang、Ilan Marek
DOI:10.1021/jacs.7b04255
日期:2017.6.21
Through a sequence that can be performed in a single vessel, involving regio- and diastereoselective copper-catalyzedcarbomagnesiation of cyclopropenes, reaction with acylsilanes, and addition of THF as cosolvent, Brook rearrangement can be triggered to furnish a wide range of cyclobutenes with exceptional diastereoselectivity. Accordingly, stereodefined and highly substituted cyclobutenes with contiguous