Substitution of thallium moiety in organothallium(III) compounds by selenocyanate is reported. Arylthallium (III) compounds react with KSeCN and CuSO4·5H2O or with Cu(SeCN)2 in dioxane to give aryl selenocyanates in good yields. Alkoxythallates of styrene react smoothly with KSeCN in methanol to afford 1-alkoxy-1-phenyl-2-selenocyanatoethanes almost quantitatively. The oxyselenocyanation of terminal
A convenient, transition metal-free synthesis of difluoromethyl selenoethers from organic selenocyanates and TMSCF2H
作者:Tao Dong、Jing Nie、Cheng-Pan Zhang
DOI:10.1016/j.tet.2018.08.001
日期:2018.9
for the synthesis of aryl or alkyl difluoromethyl selenides (RSeCF2H) from the corresponding selenocyanates (RSeCN) and TMSCF2H/t-BuOK is described. The reaction performed in THF at 0 °C for 24 h or at room temperature for 6 h supplied a series of RSeCF2H in good to high yields. The successful preparation of difluoromethylselenolated sulfadimethoxine derivative and the scaled-up synthesis of 1-ben
描述了一种由相应的硒氰酸酯(RSeCN)和TMCSF 2 H / t -BuOK合成芳基或烷基二氟甲基硒化物(RSeCF 2 H)的有效且无过渡金属的方法。在THF中于0°C进行24小时或在室温下进行6小时的反应可提供一系列RSeCF 2H以高产到高产。例如,成功制备了二氟甲基硒化的磺基二甲恶英衍生物并按比例放大合成了1-苄基-5-((二氟甲基)硒基)二氢吲哚,表明该方法具有良好的实用性。该反应的优点包括温和的反应条件,良好的官能团耐受性,多种底物和高效率。该方案提供了许多新颖的二氟甲基硒醚,这些醚将加速此类化合物在生命科学领域的使用。