161196-23-2Relevant articles and documents
Regio- and Stereoselective Synthesis of Dithiocarbonates under Ambient and Solvent-Free Conditions
Diebler, Johannes,Spannenberg, Anke,Werner, Thomas
, p. 2027 - 2030 (2016)
Herein, we report on the utilization of readily available lithium tert-butoxide as an efficient catalyst for the addition of carbon disulfide to terminal and internal epoxides under ambient conditions. Notably, the reaction proceeds regio- and stereoselectively. By applying the optimized conditions, 14 terminal and internal epoxides were converted. The desired cyclic dithiocarbonates were isolated in yields up to 95 % after simple filtration over silica. NMR spectroscopy experiments to identify the mode of activation were performed, and they indicated activation of carbon disulfide by the catalyst. The reaction of cis-2,3-butyleneoxide gave only the trans-dithiocarbonate, whereas the conversion of (R)-propylen oxide gave the respective thiocarbonate stereoselectively as one enantiomer (>99 % ee) in 87 % yield.
Six-Membered Cyclic Amidines as Efficient Catalysts for the Synthesis of Cyclic Dithiocarbonates from Carbon Disulfide and Epoxides under Mild Conditions
Aoyagi, Naoto,Endo, Takeshi
, p. 92 - 96 (2019/12/30)
Six-membered cyclic amidines effectively catalyzed the reaction of carbon disulfide with epoxides under mild conditions, such as atmospheric pressure and ambient temperature, to give the corresponding cyclic dithiocarbonates (1,3-oxathiolane-2-thiones) in
Organocatalytic one-pot synthesis of functionalized 1,3-oxathiolanes and 1,3-thiazolidines
Ghazanfarpour-Darjani, Majid,Khodakarami, Alieh
, p. 829 - 835 (2016/03/23)
An efficient organocatalytic approach for the synthesis of 1,3-oxathiolanes and 1,3-thiazolidines is reported. In this methodology, conjugated base of nitromethane was employed as a potential organocatalyst to promote cyclization reaction between strained
Atom economical synthesis of di- and trithiocarbonates by the lithium: Tert -butoxide catalyzed addition of carbon disulfide to epoxides and thiiranes
Diebler,Spannenberg,Werner
supporting information, p. 7480 - 7489 (2016/08/16)
Alkali metal alkoxides were studied as catalysts for the addition of CS2 to epoxides. A screening of several commercially available alkoxides revealed lithium tert-butoxide as an active and selective catalyst for this reaction. The influence of different reaction parameters as well as the substrate scope under optimized reaction conditions has been studied. Terminal and highly substituted epoxides as well as thiiranes were converted. In total 28 products were prepared and isolated in yields up to 95%. Notably, the reactions were performed under mild conditions without additional solvents. The regio- and stereoselectivity of the reaction has been studied e.g. by converting (R)-styrene and (R)-propylene oxide. Moreover, the test reaction was monitored by 13C NMR and a plausible mechanism for the conversion of terminal and internal epoxides is given. This proposal is in agreement with the observed regio- and stereoselectivity of the reaction.
Cyclic dithiocarbonates, their preparation and application
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Page/Page column 13, (2010/02/10)
The present invention relates to cyclic 5-membered ring dithiocarbonate compounds of the general formula wherein, in the formula, R1, R2, and R3 are the same or different, each of which denotes hydrogen or a C1 to C4 strai