Transition-metal-catalyzed, directed intermolecular C–Hbond functionalization is synthetically useful but heavily underexplored in multiheteroatom heterocycle synthesis. Herein we report a cobalt catalytic method for the formation of a three-nitrogen-bearing benzotriazine scaffold via the coupling of arylhydrazine and oxadiazolone. This synthetic protocol features a low-cost base metal catalyst, a
aldehydes to cyanamides was developed featuring a wide substrate scope and great functional group tolerability. This method allows for transformations of readily available, inexpensive, and abundant aldehydes to highly valuable cyanamides in a pot, atom, and step-economical manner with a green nitrogen source. This protocol will serve as a robust tool for the installation of the cyanamide moiety in various
Diastereoselective Opening of Bridged Anhydrides by Amidoximes Providing Access to 1,2,4-Oxadiazole/Norborna(e)ne Hybrids
作者:Sergey Baykov、Marina Tarasenko、Lev E. Zelenkov、Svetlana Kasatkina、Polina Savko、Anton Shetnev
DOI:10.1002/ejoc.201900843
日期:2019.9.8
A unique example of the one‐pot trans‐diastereoselective reaction of meso‐tricyclic anhydrides yielding 1,2,4‐oxadiazole/norborna(e)nehybrids with > 95 % de without any additional purifications is described.
Efficient Synthesis of Functionalized Indene Derivatives via Rh(III)‐Catalyzed Cascade Reaction between Oxadiazoles and Allylic Alcohols
作者:Jing Zhang、Jun‐Shu Sun、Ying‐Qi Xia、Lin Dong
DOI:10.1002/adsc.201801606
日期:2019.4.23
A highly efficient rhodium(III)‐catalyzedsynthesis of novel functionalized indene derivatives has been achieved via C−H activation/intramolecular aldol condensation. This cascade reaction is an atom economical protocol which could be further applied to build more complexcompounds.