KO<sup><i>t</i></sup>Bu-Promoted Transition-Metal-Free Transamidation of Primary and Tertiary Amides with Amines
作者:Tridev Ghosh、Snehasish Jana、Jyotirmayee Dash
DOI:10.1021/acs.orglett.9b02306
日期:2019.9.6
transamidation of primary and tertiary amides with a range of aryl, heteroaryl, and aliphatic amines using potassium tert-butoxide. The reaction proceeds at roomtemperature under transition-metal-free conditions providing secondary amides in high yields. Moreover, reaction of cyclopropyl amine with tertiary amides proceeds with ring-opening to provide a rapid access to enamides.
Rh<sub>2</sub>(II)-Catalyzed Ring Expansion of Cyclobutanol-Substituted Aryl Azides To Access Medium-Sized <i>N</i>-Heterocycles
作者:Wrickban Mazumdar、Navendu Jana、Bryant T. Thurman、Donald J. Wink、Tom G. Driver
DOI:10.1021/jacs.7b01833
日期:2017.4.12
A new reactivity pattern of Rh2(II)-N-arylnitrenes was discovered that facilitates the synthesis of medium-sized N-heterocycles from ortho-cyclobutanol-substituted aryl azides. The key ring-expansion step of the catalytic cycle is both chemoselective and stereospecific. Our mechanistic experiments implicate the formation of a rhodium N-arylnitrene catalytic intermediate and reveal that sp3 C-H bond