158554-93-9

Upstream product

• 158554-90-6 (S)-3-Benzyl-4-isopropyl-thiazolidine-2-thione 

Relevant academic research and scientific papers

Synthesis and pyrolytic behaviour of thiazolidin-2-one 1,1-dioxides

Four examples of the chiral thiazolidin-2-one 1,1-dioxides 5 have been prepared by reaction of the appropriate amino alcohols 11 with CS2 in aqueous sodium hydroxide to give the thiazolidine-2-thiones 12, followed by oxidation with KMnO4 under phase-transfer conditions in the presence of benzoic acid, either directly or via the thiazolidin-2-ones 13. Upon flash vacuum pyrolysis (FVP) at 650°C, 5a-c decompose mainly by loss of SO2 to give an alkene and benzyl isocyanate together with other products from fragmentation of the N-benzyl group. A significant minor pathway involves net loss of CO2 and water to give the 2-phenyl-4,5-dihydrothiazoles 21 together with their aromatisation products 22 and 23. A mechanism for this new heterocyclic transformation is proposed involving initial expansion to a cyclic carbamic-sulnnic anhydride (2,1,4-oxathiazin-3-one 1-oxide). The fully assigned 13C NMR spectra are presented for 5, 12 and 13 and the 33S NMR spectrum has been obtained for 5c.

Effect of added benzoic acid on the phase-transfer catalysed permanganate oxidation of organosulfur compounds

The addition of benzoic acid in the oxidation of a range of sulfides and thiazolidinethiones using KMnO4 under phase-transfer conditions provides a convenient and high yielding procedure for formation of the corresponding sulfones, thiazolidinones and thiazolidinone S,S-dioxides.

Unexpected Thermal Extrusion of CO2 from 3-Benzylthiazolidin-2-one 1,1-Dioxides to Give 2-Phenylthiazolines and Thiazoles

Flash vacuum pyrolysis of a series of chiral 3-benzylthiazolidin-2-one 1,1-dioxides 5, readily prepared from amino acids, results mainly in loss of SO2 to give an alkene and benzyl isocyanate, but a significant minor pathway involves unexpected loss of CO2 and water to give 2-phenylthiazolines 13 and derived thiazoles.