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.
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.