Mesoionic 1, 3-oxazolium-5-olates (munchnones) react fairly rapidly with oxygen to give the autoxidation products when the C-4 substituent is aromatic. The autoxidation occurred in the munchnones generated from N-acyl tetrahydroisoquinoline-1-carboxylic acids or tetrahydro-β-carboline-1-carboxylic acids. The mechanism was elucidated by 18O labeling experiments and involved a series of well-precedented autoxidative processes including oxygenation, cyclization of the resulting peroxy anion, and oxidative cleavage.
中性离子1, 3-
噁唑鎓-5-醇盐(munchnones)在C-4取代基为芳香族时,与氧反应相对迅速,生成自氧化产物。自氧化发生在由N-酰基
四氢异喹啉-1-
羧酸或四氢-β-卡比啉-1-
羧酸生成的munchnones中。通过18O标记实验阐明了机制,涉及一系列已知的自氧化过程,包括氧化、产物过
氧阴离子的环化和氧化断裂。