position ortho to the carboxylate. A reversal of regioselectivity is observed when the acid is treated with n-BuLi/t-BuOK. These results are of general utility for the one-pot preparation of a variety of very simple 3- and 6-substituted 2-methoxybenzoic acids that are not easily accessible by conventional means. The potential usefulness of the method is demonstrated by the expedient synthesis of lunularic
[反应:见正文]通过在-78摄氏度下用s-BuLi / TME
DA处理,未保护的2-
甲氧基苯甲酸仅在
羧酸酯邻位被去质子化。当用n-BuLi / t-BuOK处理酸时,观察到区域选择性的逆转。这些结果对于通过常规方法不容易获得的各种非常简单的3-和6-取代的2-
甲氧基苯甲酸的一锅法制备具有普遍用途。该方法的潜在用途已通过合成方便的
月桂酸得到了证明。