Novel Asymmetric Approach to Proline-Derived Spiro-β-lactams
作者:Alisher B. Khasanov、Michele M. Ramirez-Weinhouse、Thomas R. Webb、Mohan Thiruvazhi
DOI:10.1021/jo049430o
日期:2004.8.1
We describe a novel asymmetric approach using Staudinger chemistry to proline-derived spiro-β-lactams. A chiral group at C-4 of the acid chloride of proline directs the stereoselectivity of Staudinger chemistry and later is sacrificed to obtain optically active 5.4-spiro-β-lactams. The scope, limitations, and mechanistic rationale for the observed results of Staudinger Chemistry of the acid chloride
Synthesis, spectroscopic characterization, biological activity, and conducting properties of functionalized Ni(II) dithiocarbamate complexes with solvent extraction studies of the ligands
electrical conductivities reveal that all the complexes behave as a semiconductor at room temperature. All the synthesized dithiocarbamate ligands and complexes were screened against five human bacterial pathogens (Escherichia coli, Staphylococcus aureus, Salmonella typhi, Aeromonas hydrophila, and Shigella boydii) by disc diffusion method. Solvent extraction studies show that the ligand has strong extractability
Synthesis of imines fromamines and aliphatic alcohols (C1–C6) in the presence of base on supported palladium nanoparticles has been achieved for the first time. The catalytic system shows high activity and selectivity in open air at room temperature.
Access to novel functionalized trifluoromethyl β-lactams by ring expansion of aziridines
作者:S. Decamps、L. Sevaille、S. Ongeri、B. Crousse
DOI:10.1039/c4ob01262c
日期:——
From carboxylic acid trifluoromethyl aziridines, halogeno β-lactams were obtained stereoselectively by ringexpansion. Different conditions such as radical, organometallic reactions allowed easy and selective access to CF3-β-lactams substituted at the C-3 position.