Visible-Light-Promoted Remote C(sp<sup>3</sup>)–H Amidation and Chlorination
作者:Qixue Qin、Shouyun Yu
DOI:10.1021/acs.orglett.5b00582
日期:2015.4.17
A visible-light-promoted C(sp(3))-H amidation and chlorination of N-chlorosulfonamides (NCSs) is reported. This remote C(sp(3))-H functionalization can be achieved in weak basic solution at room temperature with as little as 0.1 mol % of a photocatalyst. A variety of nitrogen-containing heterocycles (up to 94% yield) and chlorides (up to 93% yield) are prepared from NCSs. Late-stage C(sp3)H functionalization of complex and biologically important (-)-cis-myrtanylamine and (+)-dehydroabietylamine derivatives can also be achieved with excellent yields and regioselectivity.
Gold(I)-Catalyzed Domino Ring-Opening Ring-Closing Hydroamination of Methylenecyclopropanes (MCPs) with Sulfonamides: Facile Preparation of Pyrrolidine Derivatives
作者:Min Shi、Le-Ping Liu、Jie Tang
DOI:10.1021/ol0614830
日期:2006.8.1
Reaction of methylenecyclopropanes 1 with sulfonamides produces the corresponding pyrrolidine derivatives 3 in moderate to good yields under the catalysis of Au(I) via a domino ring-opening ring-closing hydroamination process.
Aniline‐Type Hypervalent Iodine(III) for Intramolecular Cyclization via C−H Bond Abstraction of Hydrocarbons Containing N‐ and O‐Nucleophiles
作者:Yuna Nishiguchi、Katsuhiko Moriyama
DOI:10.1002/adsc.202100316
日期:2021.7
We developed a method for the preparation of (diacetoxyiodo)-2-(N-alkylamido)benzene as an aniline-type hypervalent iodine(III). We also achieved direct cyclizations via C−H bond abstraction, such as the Hofmann-Löffler-Freytag reaction, a direct amination, and a direct lactonization, using the aniline-type hypervalent iodine(III) to obtain corresponding products in high yields.
TMSOTf mediated ‘5/6-<i>endo-dig</i>’ reductive hydroamination for the stereoselective synthesis of pyrrolidine and piperidine derivatives
作者:Santosh J. Gharpure、Dharmendra S. Vishwakarma、Raj K. Patel
DOI:10.1039/c9cc03127h
日期:——
A TMSOTf mediated 5/6-endo-dig reductive hydroamination cascade on internal alkynylamines gave expedient, stereoselective access to pyrrolidine and piperidine derivatives. We also demonstrate that a protecting group on nitrogen has a profound effect on the reactivity as well as diastereoselectivity of the reductive hydroamination cascade.