Metal-free electrochemical [3 + 2] heteroannulation of anilines with pyridines enabled by dual C–H radical aminations
作者:Mu-Jia Luo、Xuan-Hui Ouyang、Yan-Ping Zhu、Yang Li、Jin-Heng Li
DOI:10.1039/d1gc02922c
日期:——
electrochemical intermolecular [3 + 2] heteroannulation of anilines with electron-deficient pyridines enabled by dual C–H radicalaminations for producing functionally diverse benzo[4,5]imidazo[1,2-a]pyridines is described. The site-selectivity of aminations of aryl C(sp2)–H bonds relies on the electronic effect of two reaction partners: each contributed two reactive sites (a C(sp2)–H bond and a nitrogen
A Gold Carbene Manifold to Prepare Fused γ-Lactams by Oxidative Cyclisation of Ynamides
作者:Fernando Sánchez-Cantalejo、Joshua D. Priest、Paul W. Davies
DOI:10.1002/chem.201804378
日期:2018.11.22
in γ‐lactam synthesis but are limited by preferential over‐oxidation to form α‐keto imides. Evaluating the factors that might limit N‐cyclisation pathways led to effective gold‐catalysed conditions that allow access to different fused γ‐lactams on changing the ynamide N‐substituent and accommodate previously incompatible substitution patterns. New and efficient methods for the synthesis of functionalised
Regioselective/electro-oxidative intermolecular [3 + 2] annulation for the preparation of indolines
作者:Qingqing Wang、Pan Wang、Xinlong Gao、Dan Wang、Shengchun Wang、Xingan Liang、Liwei Wang、Heng Zhang、Aiwen Lei
DOI:10.1039/c9sc05729c
日期:——
amines or vinyl anilines for the preparation of pyrrolidines or indolines, the intermolecular version is less studied. Herein, this electrochemical intermolecular oxidative annulation of anilines and alkenes for the preparation of indolines proceeded under external oxidant-free conditions. The most noteworthy achievement of our work is the facile generation of indolines with quaternary centers at the
Nucleophilic<i>ortho</i>-Propargylation of Aryl Sulfoxides: An Interrupted Pummerer/Allenyl Thio-Claisen Rearrangement Sequence
作者:Andrew J. Eberhart、David J. Procter
DOI:10.1002/anie.201300223
日期:2013.4.2
A new direction: The nucleophilic ortho‐propargylation of aryl sulfoxides exploits intermolecular delivery of the nucleophile to sulfur followed by an intramolecular relay to carbon (see scheme). The simple, metal‐free procedure is general, regiospecific with regard to the propargyl nucleophile, and completely selective for products of ortho‐propargylation over allenylation.