18212-62-9Relevant academic research and scientific papers
Sterically controlled diastereoselectivity in thio-Staudinger cycloadditions of alkyl/alkenyl/aryl-substituted thioketenes
He, Wei,Zhuang, Junpeng,Yang, Zhanhui,Xu, Jiaxi
, p. 5541 - 5548 (2017)
The [2 + 2] cycloadditions of thioketenes and imines are named as thio-Staudinger cycloadditions. The diastereoselectivity in thio-Staudinger cycloaddtions of alkyl/alkenyl/aryl-substituted thioketenes is rationalized. The steric effects of the thioketenes play an extremely important role in deciding the diastereoselectivity (cis/trans selectivity) through controlling exo- and endo-attack and subsequent ring closure. The conclusion is further supported by our additional experimental and calculational results. The isomerization of the iminium moiety in zwitterionic intermediates generated from the thioketenes and linear imines also affects the diastereoselectivity. The electronic effect of imine substituents slightly impacts the diastereoselectivity, while epimerization of cis-β-thiolactams to trans-diastereomers is a significant factor in the thio-Staudinger cycloadditions of mono-substituted thioketenes under basic conditions.
Stereochemistry and mechanistic insights in the [2t + 2i + 2i] annulations of thioketenes and imines
He, Wei,Zhuang, Junpeng,Du, Hongguang,Yang, Zhanhui,Xu, Jiaxi
, p. 9424 - 9432 (2017/11/22)
Stereochemical models and mechanistic insights are proposed for [2t + 2i + 2i] annulations of thioketenes and imines on the basis of experimental and computational investigations. In the [2t + 2i + 2
Traceless solid-phase synthesis of 1,2,3-thiadiazole derivatives from resin-bound acylhydrazine
Liu, Zhanxiang,Mu, Yuanyuan,Lin, Jie,Chen, Yiya
experimental part, p. 4407 - 4414 (2009/04/11)
A novel synthesis of 1,2,3-thiadiazole derivatives using a traceless solid-phase approach is described, in which many kinds of 1,2,3-thiadiazole derivatives were efficiently obtained in good yields and high purities via traceless cyclization cleavage of resin-bound acylhydrazones with thionyl chloride. Copyright Taylor & Francis Group, LLC.
Synthesis of lithium 1-alkynesulfenates by the mild oxidation of thiolates with a pinacolone-derived N-sulfonyloxaziridine
Sandrinelli, Franck,Boudou, Cédric,Caupène, Caroline,Averbuch-Pouchot, Marie-Thérèse,Perrio, Stéphane,Metzner, Patrick
, p. 3289 - 3293 (2008/09/18)
Lithium 1-alkynethiolates, generated by a base-induced ring cleavage of 4-substituted 1,2,3-thiadiazoles, were efficiently converted into the corresponding sulfenate salts by mild oxidation using an N-sulfonyloxaziridine derived from pinacolone. In situ S
