Isothiourea-Mediated Asymmetric Functionalization of 3-Alkenoic Acids
作者:Louis C. Morrill、Samuel M. Smith、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1021/jo402591v
日期:2014.2.21
Isothiourea HBTM-2.1 promotes the catalytic asymmetric alpha-functionalization of 3-alkenoic acids through formal [2 + 2] cycloadditions with N-tosyl aldimines and formal [4 + 2] cycloadditions with either 4-aryltrifluoromethyl enones or N-aryl-N-aroyl diazenes, providing useful synthetic building blocks in good yield and with excellent enantiocontrol (up to >99% ee). Stereodefined products are amenable to further synthetic elaboration through manipulation of the olefinic functionality.
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.
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).