Novel use of N-carboalkoxy a,b-unsaturated iminium ions as dienophiles in Diels-Alder reactions.

[摘要]：Tricyclic spiro-N,O-acetals were assembled in a single step by cycloaddn. of hydroxymethyl dienes to iminium ion-activated dienophiles that were generated by acidolysis of a,b-unsatd. N-carboalkoxy N,O-acetals or b-methoxymethyl N-carboalkoxy enamines. The cycloaddn. was conducted using Sc(OTf)3 as a mild Lewis acid affording the endo adducts in moderate yields.

[全文传递流程]：

一般上传文献全文的时限在1个工作日内