Synthesis of Thiiranes from Epoxides in the Presence of Thiourea in a Weakly Hydrated Organic Medium

Montmorillonite K-10: A Mild, Inexpensive and Convenient Catalyst for Synthesis of Thiiranes from Oxiranes under Non-Aqueous Conditions

Montmorillonite K-10 catalyses the conversion of oxiranes to the corresponding thiiranes in the presence of thiourea efficiently and the yields obtained are excellent.

Efficient Conversion of Epoxides to Episulfides with Thiourea Catalysed with Cerium (IV)

Efficient conversion of epoxides into episulfides with thiourea in the presence of ceric ammonium nitrate (CAN) as catalyst and under mild and non-aqueous conditions is reported; this conversion was performed under both conventional heating and microwave conditions and distinct rate enhancement was observed under microwave irradiation.

Efficient Conversion of Oxiranes to Thiiranes with Ammonium Thiocyanate Catalysed with LiBF4

Oxiranes are efficiently converted into the corresponding thiiranes by ammonium thiocyanate in the presence of catalytic amounts of LiBF4 in excellent yields under mild and non-aqueous conditions

Cyclization Reaction of Donor-Acceptor Oxiranes with N,N'-Disubstituted Thioureas: A Domino Process to trans-Dihydropyrimidines

An unprecedented cyclization reaction of donor-acceptor oxiranes with N,N'-disubstituted thioureas to construct trans-dihydropyrimidines is presented. Preliminary reaction mechanism studies demonstrated that the reaction underwent sequential cycloaddition/amine ester exchange/oxygen-sulfur exchange/desulfuration/Michael addition process. A wide range of trans-dihydropyrimidines were produced with high yields up to 94% by using this method.

Catalytic Enantioselective Conversion of Epoxides to Thiiranes

A highly efficient and enantioselective Brønsted acid catalyzed conversion of epoxides to thiiranes has been developed. The reaction proceeds in a kinetic resolution, furnishing both epoxide and thiirane in high yields and enantiomeric purity. Heterodimer formation between the catalyst and sulfur donor affords an effective way to prevent catalyst decomposition and enables catalyst loadings as low as 0.01 mol %.

Bi(TFA)3 and Bi(OTf)3 Catalyzed Conversions of Epoxides to Thiiranes with Ammonium Thiocyanate and Thiourea under Non-Aqueous Conditions

Various epoxides are converted to their corresponding thiiranes in excellent yields with ammonium thiocyanate and thiourea under non-aqueous conditions in the presence of catalytic amounts of Bi(TFA)₃ and Bi(OTf)₃.

Iron(III) 5,10,15,20-Tetrakis (pentafluorophenyl)-porphyrin as an Efficient Catalyst for Conversion of Epoxides to Thiiranes

Iron(III) 5,10,15,20-tetrakis(pentafluorophenyl) porphyrin, Fe(TF5PP)CI, is a new catalyst for the conversion of epoxides to the corresponding thiiranes in the presence of ammonium thiocyanate in excellent yields.