- One-pot syntheses of 2,3-dihydrothiopyran-4-one derivatives by Pd/Cu-catalyzed reactions of α,β-unsaturated thioesters with propargyl alcohols
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(Chemical Equation Presented) 2,3-Dihydrothiopyran-4-one derivatives were readily prepared by Pd/Cu-catalyzed reactions between α,β-unsaturated thioesters and propargyl alcohols in the presence of bases. Of note, both carbon-sulfur bonds were cleaved as a result of the single procedure.
- Minami, Yasunori,Kuniyasu, Hitoshi,Kambe, Nobuaki
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supporting information; experimental part
p. 2469 - 2472
(2009/05/26)
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- Tandem type polymerization. Synthesis and characterization of ordered poly(amide-thioether) from 2,6-dichlorophenyl methacrylate, 4,4′-thiobis(benznenethiol), and 4,4′-oxydianiline
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Ordered poly(amide-thioether) (17) was prepared by tandem type polymerization of 2,4-dichlorophenyl acrylate (11), 4,4′-thiobis(benznenthiol) (12), and 4,4′-oxydianiline (16). The polymerization was carried out by mixing all monomers in the presence of catalytic amounts of triethylamine (TEA) and 1-hydroxybenzotriazole (HOBt) in 1-methyl-2-pyrrolidinone (NMP) at 20 °C for 2 h and then 80 °C for 2 days, yielding polymer 17 with a number-average molecular weight (Mn) of 25 000. Authentic ordered poly(amide-thioether) (18) was prepared to verify the structure of polymer 17. The microstructure of polymers obtained was investigated by 1H and 13C NMR spectroscopy, and it has been found the polymer obtained has the expected ordered structure. Furthermore, model reactions were studied in detail to demonstrate the feasibility of ordered polymer formation.
- Tsuchiya, Kousuke,Shibasaki, Yuji,Ueda, Mitsuru
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p. 1815 - 1818
(2007/10/03)
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