Rh(III)-Catalyzed Redox-Neutral Annulation of Primary Benzamides with Diazo Compounds: Approach to Isoquinolinones
作者:Youzhi Wu、Peng Sun、Kaifan Zhang、Tie Yang、Hequan Yao、Aijun Lin
DOI:10.1021/acs.joc.5b02824
日期:2016.3.4
Reported herein is a Rh-catalyzed redox-neutralannulation of primary benzamides with diazo compounds, representing an efficient and economic protocol to isoquinolinones. The procedure exhibited good functional group tolerability, scalability, and regioselectivity, obviating the need for oxidants, and only environmentally benign N2 and H2O were released. Further utilization of the method provided an
Taming tosyl azide: the development of a scalable continuous diazo transfer process
作者:Benjamin J. Deadman、Rosella M. O'Mahony、Denis Lynch、Daniel C. Crowley、Stuart G. Collins、Anita R. Maguire
DOI:10.1039/c6ob00246c
日期:——
azide were accessed in a ‘one pot’ batch procedure using shelf stable, readily available reagents. For large scale diazo transfer reactions tosyl azide was generated and used in a telescoped flow process, to mitigate the risks associated with handling potentially explosive reagents on scale. The in situ formed tosyl azide was used to rapidly perform diazo transfer to a range of acceptors, including
Diastereoselective Synthesis of 2-(1,3-Dioxolanes-4-yl)-4<i>H</i>
-pyran-4-ones from 2-Diazo-3,5-dioxo-6-ynoates (sulfones) and Aldehydes Based on Tandem Cyclization-Cycloaddition Strategy
作者:Jianfang Zhang、Guisheng Deng、Jianbo Wang
DOI:10.1002/ejoc.201900545
日期:2019.6.30
A novel and efficient synthesis of 2‐(1,3‐dioxolanes‐4‐yl)‐4H‐pyran‐4‐ones from 2‐diazo‐3,5‐dioxo‐6‐ynoates (sulfones) and aldehydes have been accomplished by AgSbF6/Rh2(OAc)4‐catalyzed tandem cyclization under mild conditions. We believe the synthetic methodology to efficiently construct this type of heterocyclic compounds have strong capacity to be applied in organic synthetic field.
Regioselective access to substituted oxindoles via rhodium-catalyzed carbene C–H insertion
作者:Delphine Gauthier、Robert H. Dodd、Philippe Dauban
DOI:10.1016/j.tet.2009.08.006
日期:2009.10
insertion of the resulting carbenes into an aromatic C–H bond gives access to substituted oxindoles. The reaction takes place with aromatic rings substituted by either electron-donating or -withdrawing groups at ortho, meta or para positions and the regioselectivity can be controlled by a substitution α to the diazo functionality. In the presence of an ester, the reaction leads to the formation of 2-silylo
α-Crotyl-α-difluoroboranyloxy-amides: Structure and Reactivity of Isolable Intermediates in Stereospecific α-Ketol Rearrangements
作者:Jan Roßbach、Klaus Harms、Ulrich Koert
DOI:10.1021/acs.orglett.5b01427
日期:2015.6.19
stereospecific BF3-mediated α-ketol rearrangement of β-hydroxy-α-ketoamides yields isolable 2-difluoroboranyloxy-3-keto-amides. X-ray and NMR analysis reveal a carbonyl coordination of the boron by the amide not the ketone. The boron complexes are air-stable solids, can be purified by silica gel chromatography, and exhibit novel reactivity in bromination and superior stereoselectivity in dipolar cycloaddition