Electrophilic methylthiomethylation of enol ethers and activated aromatic compounds. Application of the former reaction to the synthesis of the macrocycle, 3,3,7,7,11,11,15,15-octamethyl-1,9-dithia-5,13-diaza-cyclohexadecane
作者:Robert McCrindle、Alan J. McAlees、Donald K. Stephenson
DOI:10.1039/p19810003070
日期:——
Enol ethers of dialkylacetaldehydes, either as such, or generated in situ from the corresponding acetals, undergo ready methylthiomethylation when heated with dimethyl sulphoxide–acetic anhydride (or methylthiomethyl acetate) in the presence of boron trifluoride–diethyl ether. These same reagent combinations can be used to methylthio-methylate certain activated aromatic compounds. The synthetic utility
二烷基乙醛的烯醇醚本身或由相应的乙缩醛原位生成,当在三氟化硼-乙醚存在下与二甲基亚砜-乙酸酐(或乙酸甲硫基甲基乙酸甲酯)一起加热时,会立即发生甲硫基甲基化。这些相同的试剂组合可用于甲硫基甲基化某些活化的芳族化合物。前一反应的合成效用在2,2,6,6-二甲基-4-噻庚二酮(4)的合成中得到了证明,该化合物已转化为3,3,7,7,11,11,15,15-八甲基-1,9-二硫杂-5,13-二氮杂环十六烷(7)。