stereoselective macrocyclic ring-closing metathesis reactions that generate Z-enoates as well as (E,Z)- or (Z,E)-dienoates are disclosed. Reactions promoted by 3.0–10 mol % of a Mo-based monoaryloxide pyrrolide complex proceed to completion within 2–6 h at room temperature. The desired macrocycles are formed in 79:21 to >98:2 Z/E selectivity; stereoisomerically pure products can be obtained in 43–75% yield after
公开了产生Z-烯酸酯以及(E,Z)-或(Z,E)-二烯酸酯的催化剂控制的立体选择性大环闭环复分解反应的第一个实例。3.0-10 mol% 的 Mo 基单芳氧基
吡咯化合物配合物促进的反应在室温下 2-6 小时内完成。所需的大环以 79:21 至 >98:2 Z/E 选择性形成;层析后可获得立体异构纯产物,产率为 43-75%。通过
天然产物 (+)-阿西西林的简明形式合成的应用证明了实用性。