Thermal azide–alkene cycloaddition reactions: straightforward multi-gram access to Δ<sup>2</sup>-1,2,3-triazolines in deep eutectic solvents
作者:Filip Sebest、Luis Casarrubios、Henry S. Rzepa、Andrew J. P. White、Silvia Díez-González
DOI:10.1039/c8gc01797b
日期:——
The multi-gram synthesis of a wide range of 1,2,3-triazolines via azide–alkene cycloaddition reactions in a Deep Eutectic Solvent (DES) is reported. The role of DES in this transformation as well as the origin of the full product distribution was studied with an experimental/computational-DFT approach.
atom-efficient nitrenetransfer reagents in the (porphyrin)ruthenium-catalyzed amination of olefins. Several azides, olefins and [Ru(porphyrin)CO] complexes were tested to investigate the scope and limits of the reaction. Quantitative yields and short reaction times were achieved by using terminal olefins and aryl azides bearing electron-withdrawing groups on the aryl moiety. The reactions were influenced
The covalently heterogenisation of a free-base porphyrin on SBA-15silica yielded TPPH2@SBA-15 (TPPH2 = tetraphenyl porphyrin), which was very efficient to promote the CO2 cycloaddition to three-membered rings. The TPPH2@SBA-15/TBAX-based catalytic procedure was very general, as revealed by excellent activities registered in the reaction of CO2 with epoxides, N-alkyl and N-aryl aziridines, forming
TPPH2/TBACl‐catalyzed (TPPH2=dianion of tetraphenyl porphyrin; TBACl=tetrabutyl ammonium chloride) carbon dioxide cycloaddition to N‐aryl aziridines was successful in synthesizing N‐aryl oxazolidin‐2‐ones. A catalytic tandem reaction was also developed, in which N‐aryl aziridines were initially synthesized and then reacted with carbon dioxide without being purified. The procedure occurred with a very
Ga‐Catalyzed Temperature‐Dependent Oxazolidinone/Piperazine Synthesis from Phenyl Aziridines Involving a Divergent Ligand‐Assisted Mechanism
作者:Maria Distressa G. Billacura、Ryan D. Lewis、Neil Bricklebank、Alex Hamilton、Christopher J. Whiteoak
DOI:10.1002/adsc.202300537
日期:2023.9.19
of CO2 and aziridines to form oxazolidinones is presented. It has been possible to optimize the catalyst system for the selective formation of a single regioisomer, in excellent yield, under relatively mild reaction conditions. The optimized catalyst system has been successfully applied to a range of substituted aziridines derived fromstyrene oxide. It has been observed that aziridines bearing two