Incorporation of carbon dioxide into phthalides via ligand-free copper-catalyzed direct carboxylation of benzoxasiloles
作者:Thanh V. Q. Nguyen、José A. Rodríguez-Santamaría、Woo-Jin Yoo、Shū Kobayashi
DOI:10.1039/c7gc00917h
日期:——
The directcarboxylation of benzoxasiloles with carbondioxide proceeded smoothly under mild conditions using copper iodide as a catalyst to afford phthalides after an acid work-up. Broad substrate scope and application of this methodology for the synthesis of natural products highlight the synthetic utility of this protocol.
[EN] SILICON-BASED CROSS COUPLING AGENTS<br/>[FR] AGENTS DE COUPLAGE CROISÉ À BASE DE SILICIUM ET LEURS PROCÉDÉS D'UTILISATION
申请人:UNIV PENNSYLVANIA
公开号:WO2013185021A3
公开(公告)日:2014-01-30
The Design, Synthesis and Validation of Recoverable and Readily Reusable Siloxane Transfer Agents for Pd-Catalyzed Cross-Coupling Reactions
作者:Dionicio Martinez-Solorio、Adam T. Hoye、Minh H. Nguyen、Amos B. Smith
DOI:10.1021/ol400922j
日期:2013.5.17
The development of competent, recoverable and reusable 1-oxa-2-silacyclopentene (siloxane) transfer agents for Pd-catalyzed cross-coupling reactions (CCRs) of organolithium reagents with aryl and alkenyl iodides has been achieved. Drawbacks of the first-generation siloxane-transfer agent (1), relating to facile recovery for potential recycling, have been addressed.
Unification of Anion Relay Chemistry with the Takeda and Hiyama Cross-Coupling Reactions: Identification of an Effective Silicon-Based Transfer Agent
作者:Amos B. Smith、Adam T. Hoye、Dionicio Martinez-Solorio、Won-Suk Kim、Rongbiao Tong
DOI:10.1021/ja2120103
日期:2012.3.14
The unification of Anion Relay Chemistry (ARC) with the Takeda and Hiyama palladium-mediated cross-coupling processes to provide aryl aryl, alkenyl aryl, and alkenyl alkenyl coupled products by exploiting a common silicon-based transfer agent has been achieved. These results provide a practical solution for intermolecular cross-coupling of organolithium reagents without the problematic lithium halogen exchange and/or undesired homocoupling that has kept organolithium cross-couplings from achieving the same level of utility as other palladium-mediated methods (e.g., Suzuki organoboron, Negishi organozinc, Stale organotin, Kumada organomagnesium, etc.).
Anion Relay Chemistry: Access to the Type II ARC Reaction Manifold through a Fundamentally Different Reaction Pathway Exploiting 1-Oxa-2-silacyclopentanes and Related Congeners
作者:Amos B. Smith、Rongbiao Tong、Won-Suk Kim、William A. Maio
DOI:10.1002/anie.201103886
日期:2011.9.12
congener have been synthesized and demonstrated to provide access to typeIIanionrelaychemistry (ARC) through a fundamentally new mechanistic pathway. Similar to previous studies, but contrary to initial hypothesis, Brook rearrangement additives (hexamethylphosphoramide and CuI) are necessary to promote Si migration and anion capture.
截然不同:两种 1-氧杂-2-硅杂环戊烯和一种饱和同系物已被合成,并被证明可以通过一种全新的机制途径提供 II 型阴离子中继化学 (ARC)。与之前的研究类似,但与最初的假设相反,Brook 重排添加剂(六甲基磷酰胺和 CuI)对于促进 Si 迁移和阴离子捕获是必要的。