Lithio-ketene-<i>S,N</i>-acetals: New Synthesis of Multifunctionalized 2-Pyridones
作者:Hiroki Takahata、Kyoko Yamabe、Takao Yamazaki
DOI:10.1055/s-1986-31878
日期:——
Lithioketene-S,N-acetal derived from N,N-dimethylthioacetamide reacts with aryl isocyanates to give monothiodiamides, which ware transformed into enaminonitriles by sulfide extrusion of the thioiminium salts with malononitrile. Bislithioketene-O,N-acetals, generated from the enaminonitriles with 2 equivalents n-butyllithium, react with a variety of electrophiles to afford multifunctionalized 2-pyridones.
由N,N-二甲基硫代乙酰胺衍生的锂硫烯酮-S,N-缩醛与芳基异氰酸酯反应生成单硫代二酰胺,通过硫代亚胺盐与丙二腈的硫化物挤出将其转化为烯胺腈。 双锂硫烯酮-O,N-缩醛由烯胺腈与 2 当量正丁基锂生成,与多种亲电试剂反应生成多官能化 2-吡啶酮。