Sulfoximine-Directed Ruthenium-Catalyzed ortho-C–H Alkenylation of (Hetero)Arenes: Synthesis of EP3 Receptor Antagonist Analogue
摘要:
The reusable sulfoximine directing-group-assisted Ru(II)-catalyzed chemo- and regioselective ortho-C-H alkenylation of arenes and heteroarenes with acrylates and alpha,beta-unsaturated ketones/vinyl sulfone is shown. The N-aroyl sulfoximine undergoes annulation with diphenylacetylene, delivering isoquinolinones and methyl phenyl sulfoxide. The present protocol is successfully employed for the synthesis of the EP3 receptor antagonist analogue.
One-Pot Unsymmetrical {[4 + 2] and [4 + 2]} Double Annulations of <i>o</i>/<i>o</i>′-C–H Bonds of Arenes: Access to Unusual Pyranoisoquinolines
作者:Majji Shankar、Koushik Ghosh、Kallol Mukherjee、Raja K. Rit、Akhila K. Sahoo
DOI:10.1021/acs.orglett.8b02068
日期:2018.9.7
With the aid of a transformable sulfoximine directing group, unprecedented one-pot unsymmetrical double annulations [4 + 2] and [4 + 2]} of hetero(arenes) with alkynes are revealed under Ru(II) catalysis. Functionalization of both ortho-C–H bonds of (hetero)arene is reflected in the building of unusual 6,6-fused pyranoisoquinoline skeletons. Construction of four [(C–C)–(C–N) and (C–C)–(C–O)] bonds
Ruthenium-Catalyzed <i>ortho</i>-C–H Mono- and Di-imidation of Arenes with <i>N</i>-Tosyloxyphthalimide
作者:M. Ramu Yadav、Majji Shankar、E. Ramesh、Koushik Ghosh、Akhila K. Sahoo
DOI:10.1021/acs.orglett.5b00570
日期:2015.4.17
The Ru(II)-catalyzed imidation of the o-C–H bond in arenes with N-tosyloxyphthalimide is realized with the assistance of a methyl phenylsulfoximine (MPS) directing group. This method is applicable to access the hitherto difficult o-C–H di-imidation products. The sequential C–N and C–C bond formation of o-C–H arenes creates peripherally decorated benzoic acid derivatives. The readily removable MPS-DG
Sulfur and Nitrogen Modulated One-Pot Double Annulation of Arenes
作者:Majji Shankar、Arijit Saha、Arghadip Ghosh、Somratan Sau、Akhila K. Sahoo
DOI:10.1021/acs.joc.1c01674
日期:2021.11.5
nitrogen moieties of methylphenyl sulfoximine (MPS)-enabled aryl thioamides are independently involved in annulation with unactivated alkynes to construct the unusual 6,6-fused thiopyranoisoquinoline skeletons. The MPS directinggroup plays a vital role in making this unprecedented Ru-catalyzed one-pot double annulation of aryl thioamides with alkynes chemo- and regioselective. Both the o,o′-C–H bonds of
Sulfoximine Directed Intermolecular <i>o</i>-C–H Amidation of Arenes with Sulfonyl Azides
作者:M. Ramu Yadav、Raja K. Rit、Akhila K. Sahoo
DOI:10.1021/ol400411v
日期:2013.4.5
The Ru(II)-catalyzed Intermolecular o-C-H amidation of arenes in N-benzoylated sulfoximine with sulfonyl azides is demonstrated. The reaction proceeds with broad substrate scope and tolerates various functional groups. Base hydrolysis of the amidation product provides the anthranilic acid derivatives and methylphenyl sulfoximine (MPS) directing group. This method Is successfully employed for the synthesis of HMR 1766.