Rh(III)-Catalyzed Relay Double Carbenoid Insertion and Diannulation of Sulfoximine Benzamides with α-Diazo Carbonyl Compounds: Access to Furo[2,3-<i>c</i>]isochromenes
efficient rhodium-catalyzed construction of furo[2,3-c]isochromene scaffolds through tandem double carbenoid insertion and diannulation of sulfoximine benzamides with α-diazo carbonylcompounds has been developed. Mechanistic studies revealed that the alkyl-rhodium intermediate generated by carbenoid insertion was directly trapped with another molecule of carbene species, followed by subsequent intramolecular
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
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.