The total synthesis of natural products is the Holy Grail of organic synthesis and even the whole organic chemistry. However, due to the long synthetic steps, the low total yield and the difficulty in constructing the ring system caused by tension, organic synthetic chemists have been deterred. Series cyclization can solve this kind of problem, and complete the total synthesis of natural products quickly with short steps and high total yield. Aza cope / Mannich rearrangement, which combines the two-step process of AZA cope rearrangement and Mannich cyclization, can quickly and efficiently construct compound skeleton and improve the total synthesis efficiency of natural products<br>
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