Magnetic‐Nanoparticle‐Supported 2,2′‐Bis[3‐(triethoxysilyl)propyl]imidazolium‐Substituted Diethyl Ether Bis(tribromide): A Convenient Recyclable Reagent for Bromination
作者:Liqiang Wu、Zhikui Yin
DOI:10.1002/ejic.201300755
日期:2013.12.9
A new magnetic-nanoparticle-supported bromination reagent was synthesized by anchoring a 2,2′-bis[3-(triethoxysilyl)propyl]imidazolium-substituted diethylether bis(tribromide) onto the surface of γ-Fe2O3 nanoparticles and subsequently treating this new ionic liquid with bromine. The nanoparticle reagent was obtained with good loading levels and has been successfully used for the efficient bromination
Tributylstibine is an efficient reagent for debromination of phenacyl and arylmethyl bromides. The mechanistic difference between stibine and phosphine is discussed briefly.
acid/base-free domino process is developed for the regioselective synthesis of 1,2,4-trisubstituted pyrroles. The process involves 1,3-dipolar cycloaddition of unsymmetrical azomethine ylide resulting from the thermal C–C bond cleavage of unactivated aziridines with β-bromo-β-nitrostyrene, followed by a cascade of elimination and aromatization reaction sequence to preferentially furnish 1,2,4-trisubstituted
Aziridines as templates: A general strategy for the stereospecific synthesis of 2-azetidinones
作者:S. D. Sharma、Seema Kanwar、Shivani Rajpoot
DOI:10.1002/jhet.5570430103
日期:2006.1
stereochemistry of these compounds has been determined by spectroscopic methods. Further, greater diversity of β-lactams via ring expansion of these azridines-2-carboxylates were obtained by a general, efficient and direct stereospecific approach.