Radical ring opening reaction of pyridine fused heterocycles with IBA-N3 catalyzed by tetra-n-butylammonium iodide

Organotin(IV) compounds catalyzed cyanide-free synthesis of α-iminonitriles

Two polydentate pro-ligands (H2L1 and H3L2) have been reacted with different organotin(IV) halides such as Ph2SnCl2, (t-Bu)2SnCl2, and (n-Bu)2SnCl2 to synthesize six organotin(IV) compounds, [R2Sn(L1)] (R = Ph (1), t-Bu (2), n-Bu (3)) and [R2Sn(HL2)] (R = Ph (4), t-Bu (5), n-Bu (6)), respectively. All organotin(IV) compounds were characterized by FT-IR spectroscopy, 1H, 13C{1H}, and 119Sn{1H} NMR spectroscopy, HR-MS spectrometry, and single-crystal X-ray diffraction analysis. The single-crystal X-ray diffraction analyses reveal that all compounds contain a penta-coordinated tin atom except 1. Compound 1 is hexacoordinated. All organotin compounds show catalytic efficiency towards the synthesis of α-iminonitriles, with a maximum yield of up to 88%. The α-iminonitriles are synthesized from trans-β-nitrostyrene derivatives and 2-aminopyridine derivatives without using any cyanating agent.

Dearomative Ring-Opening of N-Fused Heteroarenes: Access to Tetrasubstituted Alkenes and Ketimines

We report a novel and efficient strategy for constructing tetrasubstituted alkenes and α-iminonitriles from 3-aminoindolizines and 3-aminoimidazo[1,2-a]pyridines. This approach involves a dearomative ring-opening of N-fused heteroaromatic amines coupled to a DDQ-mediated oxidative process under mild, metal-free conditions. The methodology demonstrates broad substrate scope, excellent functional group tolerance, and scalability, offering a versatile platform for synthesizing complex alkenes and nitrile-containing frameworks.

Synthesis of N-heterocyclic amides from imidazoheterocycles through convergent paired electrolysis

An efficient ring opening of imidazoheterocycles induced by a direct C-H azidation resulting in an unusual formation of N-heterocyclic amides has been successfully developed through convergent paired electrolysis. A broad scope of pyridylbenzamides could be obtained in moderate to excellent yields under exogenous-oxidant, electrolyte- and metal-free electrochemical conditions. The methodology was transferred to continuous flow conditions resulting in notable improvements particularly in terms of cost-efficiency over traditional batch versions.

Deconstructive Cycloaromatization Strategy toward N,O-Bidentate Ligands from Indolizines and Cyclopropenones

The innovative construction of novel N,O-bidentate ligands represents a long-standing challenge for chemists. Here, we report an unprecedented approach for the construction of N,O-bidentate derivatives via the merging of ring deconstruction with cycloaromatization of indolizines and cyclopropenones. Without any catalysts, our method can deliver a series of polyaryl 2-(pyridin-2-yl)phenols in excellent yields. In addition, N,O-bidentate organic BF₂ complexes can also be constructed via this one-pot protocol.