Syntheses of 1,2-diamino and 1,2-aminoalcohol derivatives in the piperidine and pyrrolidine series as anti-amnesic agents

(+)-[1-(4-Methoxy-benz-yl)pyrrolidin-2-yl]diphenyl-methanol

The title compound, C₂₅H₂₇NO₂, was obtained as the product of a Grignard reagent and an inter­mediate ester synthesized from L-(-)-proline. The asymmetric unit contains two independent mol­ecules, both of which feature an intra­molecular O—H⋯N hydrogen bond. In one of the mol­ecules, the pyrrolidine ring is disordered over two orientations in a 0.63 (3):0.37 (3) ratio.

Antimicrobial activity studies on some piperidine and pyrrolidine substituted halogenobenzene derivatives

The in vitro antibacterial and antifungal activities of the compounds synthesised from some 1,2,3,5-tetrahalogeno benzenes in presence of sodium piperidide and sodium pyrrolidide (2,6-dipiperidino-1,4-dihalogenobenzenes; 2,6-dipyrrolidino-1,4-dibromobenzene; 2,4,6-tripyrrolidino chlorobenzene; and 1,3-dipyrrolidino benzene) were investigated. The in vitro antimicrobial activities were screened against the standard strains: Staphylococcus aureus ATCC 25923 and Bacillus subtilis ATCC 6633 as Gram positive, Yersinia enterocolitica ATCC 1501, Escherichia coli ATCC 11230 and Klebsiella pneumoniae as Gram negative, and Candida albicans as yeast-like fungus. Compounds (3, 5, 6, 7) inhibited the growth of all the test strains at MIC values of 32-512 microg/ml. None of the four compounds (1, 2,4,8) studied showed antimicrobial activity against any of the test strains within the MIC range 0.25-512 micro/ml.

Practical asymmetric synthesis of 1,2-diamines in the 3-aminoazepane series

A simple and versatile method for the enantio- and diastereoselective synthesis of mono- or disubstituted 3-aminoazepanes is described. The key step involves a highly regio- and diastereoselective tandem ring-enlargement/alkylation or reduction process. This novel synthetic route provides enantiomerically pure constrained diamines interesting as scaffolds for medicinal chemistry.