Regioselective ring-opening reactions of 1,2-epoxides with thiols and arylselenols directly promoted by [Bmim]BF4
作者:Ming-Hua Yang、Guo-Bing Yan、Yun-Fa Zheng
DOI:10.1016/j.tetlet.2008.08.109
日期:2008.11
Regioselective ring-openingreactions of 1,2-epoxides with ArSH and ArSeH promoted by ionic liquid [Bmim]BF4 were investigated. A variety of β-hydroxy selenides and β-hydroxy sulfides were obtained in excellent yields (81–99%) with good regioselectivities using a mild, simple and environmentally benign procedure.
sulfides and β-hydroxyl nitriles by ring opening of epoxides with aromatic, aliphatic, and heterocyclic thiols and trimethylsilyl cyanide at room temperature under solvent free conditions. All the reactions proceeded satisfactorily in short times and afforded the corresponding products in good to excellent yields with high regioselectivity and chemoselectivity under mild reaction conditions.
Recyclable superparamagnetic Fe3O4 nanoparticles for efficient catalysis of thiolysis of epoxides
作者:Mohammad M. Mojtahedi、M. Saeed Abaee、Azam Rajabi、Peyman Mahmoodi、Saeed Bagherpoor
DOI:10.1016/j.molcata.2012.05.004
日期:2012.9
An efficient and rapid procedure is developed for room-temperature ring opening of various epoxides with thiols under solvent-free conditions in the presence of catalytic amount of superparamagnetic Fe3O4 nanoparticles. As a result, high conversion of reactants to various beta-hydroxy sulfides is observed in short time periods while the heterogeneous catalyst could be recovered and reused over several cycles without loosing its activity. Competitive reactions show higher reactivity of aromatic thiols over the aliphatic counterparts. (c) 2012 Elsevier B.V. All rights reserved.
Highly Regioselective Ring Opening of Epoxides with Thiols Catalyzed by SbCl<sub>3</sub>Under Solvent-Free Conditions
作者:Dadkhoda Ghazanfari、Mohammed M. Hashemi、Mohammad Reza Akhgar、Mohammad Mehdi Foroughi、Fariba Najafi-Zadeh
DOI:10.1080/10426500802053201
日期:2008.11.7
The ring-opening reaction of epoxides with thiols by SbCl3 supported on Kieselguhr under solvent-free conditions, afforded high yields of -hydroxy sulfides. Nucleophilic attack of the thiols occurs regioselectively at the less hindered side of the epoxides.
Rapid, benign, and additive-free thiolysis of epoxides under ultrasonic/aqueous conditions
作者:Mohammad M. Mojtahedi、Sajad Khalili
DOI:10.1080/17415993.2014.909814
日期:2014.7.4
An environmentally friendly and efficient procedure is developed for ring opening of various epoxides with thiols under non-thermal conditions. Reactions take place by ultrasonic irradiation of the two reactants suspended in an additive-free aqueous medium. Consequently, high-yield formation of various beta-hydroxy sulfides is quickly observed.[GRAPHICS].