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,
Visible-Light-Induced Catalyst-Free Carboxylation of Acylsilanes with Carbon Dioxide
作者:Zhengning Fan、Yaping Yi、Shenhao Chen、Chanjuan Xi
DOI:10.1021/acs.orglett.1c00435
日期:2021.3.19
Intermolecular carbon–carbon bond formation between acylsilanes and carbondioxide (CO2) was achieved by photoirradiation under catalyst-free conditions. In this reaction, siloxycarbenes generated by photoisomerization of the acylsilanes added to the C═O bond of CO2 to give α-ketocarboxylates, which underwent hydrolysis to afford α-ketocarboxylic derivatives in good yields. Control experiments suggest
Acylsilane represents a valuable synthon in syntheticchemistry. We report on ruthenium(II)-catalyzed ortho-C–H amination of aroylsilanes to provide facile access to syntheticallyuseful imidobenzoylsilanes and tosyl-amidobenzoylsilanes. The protocols, with broad substrate scope and excellent functional group tolerance, are enabled with the weak chelation-assistance of acylsilane via C–H cyclometallation
酰基硅烷代表合成化学中有价值的合成子。我们报告了钌 ( II ) 催化的芳酰基硅烷的邻-C-H 胺化,以提供合成有用的亚氨基苯甲酰基硅烷和甲苯磺酰基-氨基苯甲酰基硅烷的简便途径。该协议具有广泛的底物范围和出色的官能团耐受性,通过C-H 环金属化作用实现了酰基硅烷的弱螯合辅助。
Nickel-catalyzed decarbonylation of acylsilanes is developed. In sharp contrast to cross-coupling reactions of acylsilanes, in which the silyl group serves as a leaving group, the silyl group is retained in the product in this decarbonylation reaction. Although the strong binding of the dissociated CO to the nickel center frequently hinders catalyst turnover in nickel-mediated decarbonylative reactions