Asymmetric Synthesis of Tetracyclic Benzo[a]quinolizidine Targets.

[摘要]：A novel, facile, and asym. approach for the synthesis of polycyclic benzo[a]quinolizidine targets is reported. In the prepn. of more functionalized derivs., the generation of the iminium ether salt intermediate I, formed from oxazolidinone II via an unprecedented retro-Diels-Alder/N-acyliminium cyclization cascade, was obsd. This iminium ether intermediate was isolated in a good yield, characterized by X-ray crystallog., and subsequently applied as a synthetic building block.

[全文传递流程]：

一般上传文献全文的时限在1个工作日内