Stereoselective Four-Component Synthesis of Functionalized 2,3-Dihydro-4-Nitropyrroles

Rapid Generation of Tetrahydropyridines and Tetrahydroquinolines by Dearomative Cyanation/Grignard Addition

A rapid, practical and scalable method for the reductant and tansition-metal-free synthesis of a variety of novel 2,4-disubstituted tetrahydropyridines and tetrahydroquinolines is disclosed. The method is based upon dearomative functionalization of pyridines or quinolines to generate amino nitrile intermediates as masked iminium ions, which then reacted rapidly with various Grignard reagents in complete stereocontrol.

One-Pot Selective Saturation and Functionalization of Heteroaromatics Leading to Dihydropyridines and Dihydroquinolines

A one-pot regioselective two C-C-bond-forming dearomatization of pyridines and quinolines is disclosed. Two 3,4-betaines are identified for the first time as very useful organic synthons in heterocyclic chemistry. Furthermore, the chemical reactivity of the prepared trifluoromethyl ketones, a new type of push-pull enones, has been explored to develop straightforward methods for their functionalization. This protocol represents a breakthrough in the dearomatization of heteroaromatics as both the selective saturation and functionalization of heteroaromatics are achieved in high efficiency by the attachment of two substituents, including the valuable trifluoromethyl ketone group.

Molecular iodine-catalyzed multicomponent synthesis of α-cyanopyrrolines with ambient air as the oxidant under neat conditions

An eco-friendly and practical method for synthesizing α-cyanopyrrolines via iodine-catalyzed multicomponent tandem reaction of alkenes, TMSCN and N,N-disubstituted formamides with ambient air as the sole oxidant was developed.