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.
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
An Orchestrated Unsymmetrical Annulation Episode of C(sp<sup>2</sup>)–H Bonds with Alkynes and Quinones: Access to Spiro-isoquinolones
作者:Kallol Mukherjee、Majji Shankar、Koushik Ghosh、Akhila K. Sahoo
DOI:10.1021/acs.orglett.8b00468
日期:2018.4.6
A nontrivial Ru-catalyzed one-pot sequential oxidativecoupling of a (hetero)arene/vinylic/chromene system with alkyne and quinone is presented; the methyl phenyl sulfoximine (MPS) directing group is vital. This cyclization forms four (two C–C and two C–N) bonds in a single operation and produces unusual spiro-fused-isoquinolones with a broad scope. The release of phenyl methyl sulfoxide makes the