An efficient, transition-metal-free method to synthesize dihydroisobenzofuran derivatives via intramolecular hydroalkoxylation of aromatic alkynols with the promotion of cesium carbonate has been developed. The reaction proceeds regioselectively with exclusive formation of 5-exo-dig product, and only Z-isomer of the new generated double bond is observed. This new protocol features with milder reaction conditions, more convenient operation and satisfactory selectivities.
一种高效的无过渡
金属合成二氢
异苯并呋喃衍
生物的方法已被开发,该方法通过介导
铯碳酸盐对芳香族炔醇进行分子内氢烷氧化反应。反应以区位选择性进行,专一生成5-exo-dig产物,并且仅观察到新生成双键的Z-异构体。该新方法具有反应条件温和、操作便捷和选择性满意的特点。