A regio‐ and chemoselective preparation of bicyclic alkoxyoxazolium salts from amide derivatives of proline and pipecolic acid by electrophilic amide activation is reported. Mechanistic NMR experiments suggest an unusual role for the base and highlight the effect of substitution pattern of the substrates.
报道了通过亲电酰胺活化从脯
氨酸和哌可酸的酰胺衍
生物制备双环烷氧基
恶唑盐的区域和
化学选择性。机械 NMR 实验表明碱基的不寻常作用并突出了底物取代模式的影响。