4,5-trimethoxyanilides 8a-e which bear a terminal alkenyl side chain at the 3-position were prepared from 1,2,4-trimethoxybenzene (2) in four steps and 25-41% overall yield. Attempted ring closing metathesis reactions were successful in the presence of catalysts 9 for the substrates 8c-e and led to the products 10c-e (66-91% yield). Substrates 8a and 8b with a shorter alkenyl side chain did not cyclize
以
1,2,4-三甲氧基苯 (2) 为原料,通过四步和 25 步制备在 3-位带有末端链烯基侧链的 α,β,γ,δ-不饱和
2,4,5-三甲氧基苯胺 8a-e -41% 的总收率。在用于底物 8c-e 的催化剂 9 的存在下,尝试的闭环复分解反应成功并产生产物 10c-e(66-91% 产率)。具有较短链烯基侧链的底物 8a 和 8b 没有环化。