<i>trans</i>-Directing Ability of the Amide Group: Enabling the Enantiocontrol in the Synthesis of 1,1-Dicarboxy Cyclopropanes. Reaction Development, Scope, and Synthetic Applications
作者:David Marcoux、Sébastien R. Goudreau、André B. Charette
DOI:10.1021/jo902066y
日期:2009.12.4
enantioselective formation of 1,1-cyclopropane diesters via the metal-catalyzed cyclopropanation of olefins. The strategies envisioned to achieve such a goal are discussed as well as the results that led us to the discovery of the powerful trans-directingability of the amidegroup in Rh(II)-catalyzed cyclopropanation reactions. We show how this feature enables a solution for the stereoselective synthesis
Efficient One-to-One Coupling of Easily Available 1,3-Dienes with Carbon Dioxide
作者:Jun Takaya、Kota Sasano、Nobuharu Iwasawa
DOI:10.1021/ol2002094
日期:2011.4.1
reaction of atmospheric pressure carbon dioxide with 1,3-dienes is realized for the first time through PSiP-pincer type palladium-catalyzed hydrocarboxylation. The reaction is applicable to various 1,3-dienes including easily available chemical feedstock such as 1,3-butadiene and isoprene. This protocol affords a highly useful method for the synthesis of β,γ-unsaturated carboxylic acid derivatives from
Dual electrocatalysis enables enantioselective hydrocyanation of conjugated alkenes
作者:Lu Song、Niankai Fu、Brian G. Ernst、Wai Hang Lee、Michael O. Frederick、Robert A. DiStasio、Song Lin
DOI:10.1038/s41557-020-0469-5
日期:2020.8
Chiralnitriles and their derivatives are prevalent in pharmaceuticals and bioactive compounds. Enantioselective alkene hydrocyanation represents a convenient and efficient approach for synthesizing these molecules. However, a generally applicable method featuring a broad substrate scope and high functional group tolerance remains elusive. Here, we address this long-standing synthetic problem using
Gold-Catalyzed Cyclopenta- and Cycloheptannulation Cascades: A Stereocontrolled Approach to the Scaffold of Frondosins A and B
作者:David Garayalde、Karolin Krüger、Cristina Nevado
DOI:10.1002/anie.201006105
日期:2011.1.24
Golden cascades: Two diastereoselective gold‐catalyzed cascade processes in which propargyl acetates react with alkenes or 1,4‐dienes afford highly substituted five‐ and seven‐membered rings, respectively (see scheme). The concerted nature of the gold‐catalyzed Cope rearrangement has been used in the formal enantioselective synthesis of marine norsesquiterpenoids Frondosins A and B.
Regiocontrolled Reductive Vinylation of Aliphatic 1,3-Dienes with Vinyl Triflates by Nickel Catalysis
作者:Xiaobo Pang、Zhen-Zhen Zhao、Xiao-Xue Wei、Liangliang Qi、Guang-Li Xu、Jicheng Duan、Xue-Yuan Liu、Xing-Zhong Shu
DOI:10.1021/jacs.1c00142
日期:2021.3.31
a powerful tool for divergent synthesis, yet it remains a long-standing challenge for aliphatic substrates. Herein, we report a reductive approach for a branch-selective 1,2-hydrovinylation of aliphatic 1,3-dienes with R–X electrophiles, which represents a new selectivity pattern for diene functionalization. Simple butadiene, aromatic 1,3-dienes, and highlyconjugated polyene were also tolerated. The