Studies on Tellurium-Containing Heterocycles. Part 22. Tellurazepine Ring System: Preparation of 1,5-Benzotellurazepin-4-ones and Their Conversion into Fully Unsaturated 1,5-Benzotellurazepines
作者:Haruki Sashida、Hirohito Satoh
DOI:10.1248/cpb.52.413
日期:——
The treatment of o-iodopropiolanilides (12), which were easily prepared from o-iodophenylisocyanate (11) and ethynylmagnesium bromide, with sodium hydrogen telluride resulted in the intramolecular ring closure of the presumed phenyltellurol intermediates (13) to a triple bond to give the 1,5-benzotellurazepin-4-ones (14) as the sole characterized products. The obtained amides (14) were easily converted
由邻碘苯基异氰酸酯(11)和乙炔基溴化镁容易制备的邻碘丙丙腈(12)用碲化氢钠处理可导致假定的苯蝶甾醇中间体(13)分子内闭环成三键,从而得到1,5-苯并四氢呋喃酮-4-酮(14)作为唯一的特征产品。通过用四氟硼酸三甲基氧鎓处理,容易地将所获得的酰胺(14)转化为完全不饱和的内酰胺4-甲基-甲氧基-1,5-苯并二氮杂ze烷(18)。通过4-甲氧基氮杂环庚烷(18)的热分解进行分解,得到4-甲氧基喹啉(19),并挤出碲原子。