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.
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
Ru-Catalyzed One-Pot Diannulation of Heteroaryls: Direct Access to π-Conjugated Polycyclic Amides
作者:Majji Shankar、Koushik Ghosh、Kallol Mukherjee、Raja K. Rit、Akhila K. Sahoo
DOI:10.1021/acs.orglett.6b03314
日期:2016.12.16
A novel Ru-catalyzed oxidative double annulation of heteroarenes with symmetrical and unsymmetrical alkynes is reported. A general method for the unsymmetrical annulation of heteroarenes with two distinct alkynes is showcased for the first time. Methylphenyl sulfoximine (MPS) plays an important role in the annulations of heteroarenes and allows the construction of structurally complex π-conjugated
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.