A Phosphonium Ylide as a Ligand for [3 + 2] Coupling Reactions of Epoxides with Heterocumulenes under Mild Conditions
作者:Yasunori Toda、Kousuke Hashimoto、Yoko Mori、Hiroyuki Suga
DOI:10.1021/acs.joc.0c01101
日期:2020.8.21
The potential of carbonyl-stabilized phosphoniumylides as ligands for novel catalysis was explored. We found that the combination of phosphoniumylides and metal halide salts efficiently catalyzed the reaction of epoxides with carbon dioxide under mild conditions. Five-membered cyclic carbonates, including disubstituted cyclic carbonates, were obtained in good yields with the use of 1 atm of carbon
Tetraarylphosphonium Salt-Catalyzed Synthesis of Oxazolidinones from Isocyanates and Epoxides
作者:Yasunori Toda、Shuto Gomyou、Shoya Tanaka、Yutaka Komiyama、Ayaka Kikuchi、Hiroyuki Suga
DOI:10.1021/acs.orglett.7b02722
日期:2017.11.3
Preparation of a range of oxazolidinones, including enantioenriched N-aryl-substituted oxazolidinones, in which tetraarylphosphonium salts (TAPS) catalyze the [3 + 2] coupling reaction of isocyanates and epoxides effectively, is described. The key finding is a Brønsted acid/halide ion bifunctional catalyst that can accelerate epoxide ring opening with high regioselectivity. Mechanistic studies disclosed
Vanadium<sup>V</sup>(salen) catalysed synthesis of oxazolidinones from epoxides and isocyanates
作者:Christopher Beattie、Michael North
DOI:10.1039/c4ra04427d
日期:——
vanadiumV(salen) complex V+O(salen) EtOSO3− and tetrabutylammonium bromide forms a highly active catalyst system for the reaction between epoxides and isocyanates leading to oxazolidinones. The reaction conditions were optimized and the optimal conditions (80 °C in toluene for 5 hours with 2 mol% of vanadium catalyst and 2 mol% of tetrabutylammonium bromide cocatalyst) applied to eight epoxides and six aromatic
Bimetallic Aluminum(salen) Catalyzed Synthesis of Oxazolidinones from Epoxides and Isocyanates
作者:Thilo Baronsky、Christopher Beattie、Ross W. Harrington、Reyhan Irfan、Michael North、Javier G. Osende、Carl Young
DOI:10.1021/cs4001046
日期:2013.4.5
aluminum(salen) complex [Al(salen)]2O is shown to catalyze the synthesis of oxazolidinonesfromepoxides and isocyanates. The reaction is demonstrated to proceed with overall retention of epoxide stereochemistry, and both aromatic and aliphatic isocyanates can be used as substrates. In contrast to the corresponding reactions between epoxides and carbon dioxide or carbon disulfide which are also catalyzed by [Al(salen)]2O
An Approach to Synthesis of 3-Aryl-2-Oxazolidinones and In Situ`Click` Assembly of 1,2,3-Triazole Oxazolidinones
作者:Xingxian Zhang、Cheng Li、Wei Chen、Xiang Wu
DOI:10.2174/157017810791112414
日期:2010.4.1
A facile and efficient addition of isocyanates with epoxides in the presence of MgI2 etherate was reported in good yields. The corresponding 2-oxazolidinone could be easily converted into 1,2,3-triazole-oxazolidinone by click reaction in excellent yield.