71009-09-1Relevant articles and documents
Using DMF as Both a Catalyst and Cosolvent for the Regioselective Silylation of Polyols and Diols
Lv, Jian,Luo, Tao,Zou, Dapeng,Dong, Hai
, p. 6383 - 6395 (2019/11/05)
Highly regioselective silylation of primary hydroxyl groups of unprotected polyols and diols was obtained by the use of a mixed solvent of MeCN/DMF (10:1) in this study. DMF was discovered to be a good catalyst in this reaction, although the silylation us
Synthesis and Applications of Silyl 2-Methylprop-2-ene-1-sulfinates in Preparative Silylation and GC-Derivatization Reactions of Polyols and Carbohydrates
Markovic, Dean,Tchawou, Wandji Augustin,Novosjolova, Irina,Laclef, Sylvain,Stepanovs, Dmitrijs,Turks, Maris,Vogel, Pierre
, p. 4196 - 4205 (2016/03/16)
Trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, and triisopropylsilyl 2-methylprop-2-ene-1-sulfinates were prepared through (CuOTf)2C6H6-catalyzed sila-ene reactions of the corresponding methallylsilanes with SO2 at 50 °C. Sterically hindered, epimerizable, and base-sensitive alcohols gave the corresponding silyl ethers in high yields and purities at room temperature and under neutral conditions. As the byproducts of the silylation reaction (SO2+isobutylene) are volatile, the workup was simplified to solvent evaporation. The developed method can be employed for the chemo- and regioselective semiprotection of polyols and glycosides and for the silylation of unstable aldols. The high reactivity of the developed reagents is shown by the synthesis of sterically hindered per-O-tert-butyldimethylsilyl-α-d-glucopyranose, the X-ray crystallographic analysis of which is the first for a per-O-silylated hexopyranose. The per-O-silylation of polyols, hydroxy carboxylic acids, and carbohydrates with trimethylsilyl 2-methylprop-2-ene-1-sulfinate was coupled with the GC analysis of nonvolatile polyhydroxy compounds both qualitatively and quantitatively. Regio- and chemoselective silylation of polyols and carbohydrates has been achieved by employing silyl sulfinates (see the picture; TBS=tert-butyldimethylsilyl, TES=triethylsilyl, TIPS=triisopropylsilyl, TMS=trimethylsilyl). The silylation reactions proceed in high yield because the reactions are mild and fast and produce only volatile byproducts. Furthermore, the silyl sulfinates are used as new derivatization reagents for the GC analysis of nonvolatile polyhydroxy compounds.
PYRIMIDONE DERIVATIVES USED AS TAU PROTEIN KINASE 1 INHIBITORS
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Page/Page column 43, (2011/02/24)
A compound represented by the formula (I) or a pharmaceutically acceptable salt thereof: wherein Z represents nitrogen atom or C-X; X represents hydrogen atom or fluorine atom; R1 is hydrogen atom or a C1 -C3 alkyl group; L represents single bond or a C1 -C6 alkylene group which may be substituted; Y represents single bond, sulfur atom, oxygen atom, NH, or the like; R2 represents hydrogen atom or a cyclic group which may be substituted, which is used for preventive and/or therapeutic treatment of a disease caused by abnormal activity of tau protein kinase 1 such as a neurodegenerative diseases (e.g. Alzheimer disease).
