作者:Toshiaki Murai、Takamasa Nonoyama
DOI:10.1016/j.tet.2012.06.076
日期:2012.12
The reaction of thioic acid O-methyl esters with in situ generated aluminum 2-(trimethylsilyl)ethylselenolate gave selenothioic acid Se-(2-trimethylsilyl)ethyl esters in 56–78% yields. The resulting four esters were treated with a THF solution of tetrabutylammonium fluoride (TBAF) to generate selenothioic acid ammonium salts in low to good yields. The efficiency of the generation of the salts depended
硫辛酸O-甲基酯与原位生成的2-(三甲基甲硅烷基)乙基硒酸铝反应,得到硒硫酸Se-(2-三甲基甲硅烷基)乙基酯,收率为56-78 %。将所得的四种酯用四丁基氟化铵(TBAF)的THF溶液处理,以低收率或良好收率产生硒代硫氰酸铵盐。盐的产生效率取决于硒代羰基的取代基α。TBAF中的氟离子部分作为碱从酯中脱质子化,生成副产物烯硫氰酸铵。酸性盐与甲基碘的甲基化选择性地发生在硒原子上,从而以48-68%的收率得到硒代硫代硒酸甲酯。代替TBAF,我4NF和KF / 18-crown-6用于与其他抗衡阳离子生成盐。酯和盐的光谱性质表明,涉及碳-硒双键的共振结构也有助于盐的共振杂化。