The first microwave-assisted version of the tandem aza-Cope rearrangement-Mannich cyclization was developed. This sequence provides acylpyrrolidines in a single synthetic step while significantly reducing reaction times as compared to analogous reactions using conventional heating. Diastereoselectivity in these reactions may be improved by increasing the size of the amine-protecting group, an observation which has not been reported previously for aza-Cope-Mannich reactions leading to monosubstituted acylpyrrolidines. Finally, in some cases, diastereoselectivity could be improved by lowering the reaction temperature.
开发了第一种微波辅助的串联氮杂科普重排-曼尼克环化反应。这一反应序列在单一步骤中提供了酰基
吡咯烷,同时相比于使用常规加热的类似反应显著缩短了反应时间。通过增大胺保护基的体积,可以改善这些反应的立体选择性,这一观察在导致单取代酰基
吡咯烷的氮杂科普-曼尼克反应中尚未报告。最后,在某些情况下,降低反应温度也可以提高立体选择性。