Stereoselective Synthesis of 1,2,2-Trisubstituted Indane Derivatives Using a Tandem SN2-Michael Addition Sequence

Diversity-Oriented Synthesis toward Fused and Bridged Benzobicyclic Piperidin(on)es

An efficient diverse synthesis of cis-fused indenopiperidines and bridged benzomorphanones, starting from cyclopropane-fused benzomorphanothiones and benzomorphanones, respectively, using NaBH₄/NiCl₂·6H₂O/EtOH as a reducing system, is described. High rigidity of substrates allowed axially controlled syntheses of their trans-mono-alkylated derivatives, subsequently enabling access to both trans-alkyl-functionalized benzobicyclic piperidin(on)es. Diversity-oriented synthesis of naphthalene ring-containing fused naphthoindenopiperidines and bridged naphthomorphanone directly from 2-pyridones was also performed.

Synthesis of a flexible macrocyclic tetraimidazolium salt–precursor for a tetracarbene ligand with metal dependent coordination modes

The flexibly bridged macrocyclic tetra-NHC ligand 4 reacts with d⁸ transition metal ions to yield mononuclear complexes of type [M(4)](PF₆)₂ (M = Ni, Pd, Pt) while reaction with Ag⁺ yields the tetranuclear sandwich-type octacarbene complex [Ag₄(4)₂](PF₆)₄.