A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethersfrom (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72–94%). Using quaternary ammonium salts
A Radical Addition/Cyclization and Se‐Group Transfer Strategy for the Facile Synthesis of Se‐Containing Cyclopentenes under Metal‐Free and Peroxide‐Free Conditions
作者:Dian‐Liang Wang、Nan‐Quan Jiang、Zhong‐Jian Cai、Shun‐Jun Ji
DOI:10.1002/chem.202103334
日期:2021.12.20
A highly atom-economic intermolecular radicaladdition/cyclization and Se-group transfer strategy was developed for the efficient synthesis of Se-containing cyclopentenes under metal-free and peroxide-free conditions.
Organocatalytic selenosulfonylation of the C–C doublebond of α,β-unsaturatedketones to construct two contiguous stereogenic centers in an aqueous medium was described. A series of α-selenyl and β-sulfonyl ketones with various functional groups were synthesized in good yields and enantioselectivities with saturated NaCl solution as the solvent. In addition, this protocol had been successfully scaled
Visible-light-driven radical 1,3-addition of selenosulfonates to vinyldiazo compounds
作者:Weiyu Li、Lei Zhou
DOI:10.1039/d1gc02036f
日期:——
radical 1,3-selenosulfonylation of vinyldiazo compounds with selenosulfonates, providing various γ-seleno allylic sulfones in good yields. This photochemical reaction was carried out at room temperature in an open flask using ethyl acetate as the solvent without any photocatalysts or additives. The control experiments corroborated that the 1,3-addition proceeded via a radical-chain propagation process. The
The present invention relates to novel pyrimidine acyclonucleoside derivatives represented by the following general formula (I), antiviral agents containing the derivatives as the active ingredients and processes of preparation thereof. ##STR1## wherein R.sup.1 is ethyl or isopropyl; R.sup.2 is (3,5 dimethylphenyl)selenenyl; R.sup.3 is phenyl or methyl; X is oxygen; and Y is oxygen.