Conceptually different: This allyltransfer reaction is catalyzed by Lewis acids (LAs) and proceeds atom‐economically by disproportionation of the carbonyl groups through organized oxonia‐Cope transition states (see scheme). A stereoselective [n+4] ring enlargement leads to a variety of macrolides with 9‐ to 16‐membered rings.
概念上的不同:烯丙基转移反应是由路易斯酸(LAs)催化的,并且通过有组织的oxonia-Cope过渡态使羰基歧化,从而在原子经济上进行(参见方案)。立体选择的[ n +4]环扩大会生成具有9至16元环的各种大环内酯类化合物。