Synthesis of tricyclic N,O-acetals from α-functionalized rubanone. A masked 1,2,3-tricarbonyl system from quinidine
作者:Peter Langer、Jens Frackenpohl、H. M. R. Hoffmann
DOI:10.1039/a705561g
日期:——
derived from quinidine has been prepared diastereoselectively and converted into tricyclic N,O-acetals containing a masked 1,2,3-tricarbonyl functionality. Good yields have been achieved using formyl-, acetyl- and propionyl-protecting groups. The novel one-pot conversion of protected 2-bromorubanones into tricyclic Cinchona cage compounds is suggested to include a reduction–oxidation sequence and an
非对映选择性地制备了一系列衍生自奎尼丁的受保护的2-溴呋喃酮,并将其转化为含有掩蔽的1,2,3-三羰基官能团的三环N,O-缩醛。使用甲酰基,乙酰基和丙酰基保护基团已经获得了良好的收率。有人提出将受保护的2-溴呋喃酮一锅转化为三环金鸡纳笼化合物的新方法包括还原-氧化序列和分子内酰基转移。