An efficient methylthiomethylation of pyrroloisoquinolines and pyrroloquinolines has been reached by the use of ammonium acetate and dimethyl sulfoxide. Methylthiomethylated heterocycles can be obtained in moderate to good yields in most cases, while trace amounts to good yields of methylene-bridged products can be observed. Choice of DMSO activator and its amount have a great influence on the chemoselectivity
通过使用
乙酸铵和
二甲亚砜,已经实现了
吡咯并
异喹啉和
吡咯并
喹啉的有效甲
硫基
甲基化。在大多数情况下,甲
硫基
甲基化杂环可以以中等至良好的收率获得,而可以观察到痕量的亚
甲基桥接产物的良好收率。
DMSO活化剂的选择及其用量对该过程的
化学选择性有很大影响。值得注意的是,这个过程也可以是可扩展的。该工艺的另一个特点是产物可以很容易地转化为砜和
亚砜。