specific labelled ketone [2H2]-(10a) indicate that the process is intramolecular. Sulphuric acid-catalysed rearrangement of (10a) produces the unsaturated methyl ketone (13). Transformation of the tetracyclic ketones (5a and b) to some angularly functionalised hydrofluorene synthons (14a and b) to the C20-gibberellins has been achieved.
描述了使用四
氟硼酸三乙基氧鎓将饱和的
环丁酮(10a和b)和(11a和b)分别立体连接成各自的桥联
环戊酮(2a和b)和(5a和b)。特定标记的酮[ 2 H 2 ]-(10a)的重排研究表明该过程是分子内的。
硫酸催化的(10a)重排产生不饱和甲基酮(13)。已经实现了将四环酮(5a和b)转化为一些具有角度功能的氢
芴合成子(14a和b)转化为C 20-
赤霉素。