Oxiranes react smoothly with thiourea in the presence of β-cyclodextrin in water at room temperature under neutral conditions to afford the corresponding thiiranes in excellent yields; the β-cyclodextrin can be recycled.
Synthesis of Thiiranes from Oxiranes in the Presence ofβ-Cyclodextrin in Water
作者:N. Srilakshmi Krishnaveni、K. Surendra、M. Somi Reddy、Y. V. D. Nageswar、K. Rama Rao
DOI:10.1002/adsc.200303179
日期:2004.3
efficient, user-friendly procedure has been developed for the conversion of oxiranes to thiiranes under supramolecular catalysis in the presence of β-cyclodextrin in water at ambient temperature in excellent yields. The use of β-cyclodextrin in this transformation overcomes the use of heavy metal halides as promoters and chlorinatedhydrocarbons and other hazardous organic solvents.
An efficient catalyst-free synthesis of thiiranes from oxiranes using polyethylene glycol as the reaction medium
作者:Biswanath Das、V. Saidi Reddy、M. Krishnaiah
DOI:10.1016/j.tetlet.2006.09.153
日期:2006.11
A catalyst-free, high-yielding conversion of oxiranes into thiiranes has efficiently been carried out by treatment with KSCN or thiourea at room temperature using polyethyleneglycol (PEG-400) as the reaction medium.
NBS/DMSO-mediated synthesis of (2,3-dihydrobenzo[<i>b</i>][1,4]oxathiin-3-yl)methanols from aryloxymethylthiiranes
作者:Jun Dong、Jiaxi Xu
DOI:10.1039/c8nj01117f
日期:——
4]oxathiin-3-yl)methanols were synthesized via reactions of aryloxymethylthiiranes and N-bromosuccinimide (NBS) in DMSO under microwave irradiation. The reaction mechanism was proposed as an intramolecular aromatic electrophilic substitution of 1-bromo-2-(aryloxymethyl)thiiran-1-iums, generated from aryloxymethylthiiranes and NBS, and the subsequent DMSO nucleophilic ring opening reaction of thiiran-1-iums followed by
通过芳氧基甲基硫烷和N-溴琥珀酰亚胺(NBS)在DMSO下微波辐射反应合成了(2,3-二氢苯并[ b ] [1,4]氧杂嘧啶-3-基)甲醇。该反应机理被认为是由芳氧基甲基噻喃和NBS生成的1-溴-2-(芳氧基甲基)噻喃-1-鎓的分子内芳族亲电取代,以及随后的噻吩-1-鎓的DMSO亲核开环反应,随后是排水量。当前的方法提供了一种直接和简单的策略,可以从容易获得的芳氧基甲基噻喃有效地制备(2,3-二氢苯并[ b ] [1,4]氧杂蒽-3-基)甲醇。