Stereoselective synthesis of trans-β-lactams by palladium-catalysed carbonylation of vinyl aziridines
作者:Francesco Fontana、Gian Cesare Tron、Nekane Barbero、Serena Ferrini、Stephen P. Thomas、Varinder K. Aggarwal
DOI:10.1039/b920564k
日期:——
The palladium-catalysedcarbonylation of vinyl aziridines can give either the trans- or cis-beta-lactam preferentially or even the delta-lactam simply by adjusting the reaction parameters ([Pd], [CO], temperature).
A Direct Route to <i>C</i>-Vinylaziridines: Reaction of <i>N</i>-Sufonylimines with Allylic Ylides under Phase-Transfer Conditions or with Preformed Ylides at Low Temperature
作者:An-Hu Li、Li-Xin Dai、Xue-Long Hou、Min-Bo Chen
DOI:10.1021/jo952245d
日期:1996.1.1
reaction has also been carried out with preformed ylides, generated from sulfoniumsalts 3, 7, arsonium salt 14, and telluronium salts 15, 16 with a base in THF at -78 degrees C. In most examples, quantitative yields were achieved. However, the trans/cis selectivity of the reaction was not high in either case. A semistable allylic sulfonium ylide, i.e., dimethylsulfonium 3-(trimethylsilyl)allylide, was found
Facile preparation of vinylaziridines by the reaction of N-sulfonylimines and cinnamyl bromide mediated by a catalytic amount of dimethyl sulfide
作者:An-Hu Li、Li-Xin Dai、Xue-Long Hou
DOI:10.1039/p19960000867
日期:——
β-Phenylvinylaziridines are prepared in moderate to good yields from the reaction of N-sulfonylimines and cinnamyl bromide mediated by a catalytic amount of dimethyl sulfide in the presence of solid K2CO3 in acetonitrile at ambient temperature.
Palladium-Catalyzed Insertion of CO<sub>2</sub> into Vinylaziridines: New Route to 5-Vinyloxazolidinones
作者:Francesco Fontana、C. Chun Chen、Varinder K. Aggarwal
DOI:10.1021/ol201193d
日期:2011.7.1
2-Vinylaziridines undergo a mild Pd-catalyzed ring-opening cyclization reaction with an ambient atmosphere of carbon dioxide to give 5-vinyloxazolidinones. The process is high yielding as well as regio- and stereoselective.
Stereospecific Ring Expansion of Chiral Vinyl Aziridines
作者:Matthew Brichacek、Mauricio Navarro Villalobos、Alexandra Plichta、Jon T. Njardarson
DOI:10.1021/ol200263g
日期:2011.3.4
In this report, it is demonstrated that chiral vinyl aziridines can be stereospecifically ring expanded. This synthetic approach allows controlled access to chiral 2,5-cis- or 2,5-trans-3-pyrroline products from starting materials with the appropriate aziridine geometry. Twenty three ringexpansion examples, most of which feature a stereospecific cyclization, are presented.