Synthesis of Functionalized Thietanes via Electrophilic Carbenoid-Induced Ring Expansion of Thiiranes with Sulfonium Acylmethylides as Carbene Precursors
作者:Jun Dong、Hongguang Du、Jiaxi Xu
DOI:10.1021/acs.joc.9b01152
日期:2019.9.6
Various functionalized thietanes were prepared from thiiranes via an electrophilic ring expansion with rhodium carbenoids as electrophiles generated from safe and readily accessible dimethylsulfonium acylmethylides. The reaction appears to proceed through electrophilic metallocarbenoid-induced activation of thiiranes, nucleophilic ring-opening of the activated thiiranes with dimethyl sulfide as a transient
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.
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。