Facile Room-Temperature MgBr<sub>2</sub>· OEt<sub>2</sub>-Catalyzed Thiolysis of Epoxides Under Solvent-Free Conditions
作者:Mohammad M. Mojtahedi、M. Saeed Abaee、Mohammad Bolourtchian、Hassan Abbasi
DOI:10.1080/10426500601088697
日期:2007.2.15
Solvent-free ring opening of 1,2-epoxides with aromatic and aliphatic thiols under 1 mol% magnesium bromide ethyletherate catalysis affords rapid formation of β-hydroxy sulfides at ambient temperature with excellent yields. Nucleophilic attack of the thiols occurs regioselectively at the less hindered position of the epoxides.
Erbium(III) Triflate is a Highly Efficient Catalyst for the Synthesis of β-Alkoxy Alcohols, 1,2-Diols and β-Hydroxy Sulfides by Ring Opening of Epoxides
ring-opening reaction of epoxides with erbium(III) triflate are described. Epoxides can be cleaved under neutral conditions with alcohols and thiols in the presence of catalytic amounts of Lewis acid, affording the corresponding β-alkoxy alcohols and β-hydroxy sulfides in high yields. In water, epoxide ring opening occurs to produce the corresponding diols in good yields epoxides - Lewis acids - nucleophilic
Tetrabutylammonium Fluoride: A Powerful Catalyst for the Regioselective Opening of Epoxides with Thiols
作者:Domenico Albanese、Dario Landini、Michele Penso
DOI:10.1055/s-1994-25399
日期:——
Tetrabutylammonium fluoride (1) catalyses under mild conditions the opening of epoxides 2a-k with thiols 3-6 to produce the corresponding ß-hydroxy thioethers 7-11 in excellent yields (88-100%) and with high regioselectivity. Furthermore, O-protected glycidols react without any loss of the protective group.
四丁基氟化铵(1)在温和的条件下催化环氧化物 2a-k 与硫醇 3-6 的开环反应,生成相应的 ß- 羟基硫醚 7-11,收率极高(88%-100%),具有很高的区域选择性。此外,受 O 保护的缩水甘油在反应过程中不会损失任何保护基团。
LiOH-Catalyzed Simple Ring Opening of Epoxides Under Solvent-Free Conditions
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.