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
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.
Synthesis of Oxazolidinones from Epoxides and Isocyanates Catalysed by Aluminium Heteroscorpionate Complexes
作者:José A. Castro-Osma、Amy Earlam、Agustín Lara-Sánchez、Antonio Otero、Michael North
DOI:10.1002/cctc.201600407
日期:2016.6.21
of an aluminium(heteroscorpionate) complex and tetrabutylammonium bromide acts as a highly efficient catalyst system for the synthesis of oxazolidinonesfromepoxides and isocyanates. Twenty two complexes were tested derived from a range of bispyrazole ligands and containing 1–3 aluminium atoms per complex. The optimal catalyst was found to be a bimetallic complex of a thioacetamidate ligand. Under
Isocyanurate Formation During Oxazolidinone Synthesis from Epoxides and Isocyanates Catalysed by a Chromium(Salphen) Complex
作者:Xiao Wu、Jess Mason、Michael North
DOI:10.1002/chem.201702948
日期:2017.9.18
A tale of two reactions: A chromimium(salphen) complex catalyses the formation of oxazolidinonesfromepoxides and isocyanates. However, with particularly electron-deficient isocyanates, the complex catalyses cyclotrimerisation of the isocyanate to an isocyanurate instead (see scheme).