## Abstract Lewis acid‐catalyzed cyclization of proline‐derived __N__‐arylimines 8 gives the tetracyclic decahydro‐7,7,11‐trimethyl‐in‐dolizino[3,4‐__b__]quinolines 17a, b in a ratio, which is highly dependent on the coordination number of the acidic catalyst. Whereas monodentate Brønsted and Lewis
Evidence for a stepwise mechanism in formal hetero-Diels-Alder reactions of N-arylimines
✍ Scribed by Frank Linkert; Sabine Laschat; Sirpa Kotila; Thomas Fox
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- French
- Weight
- 882 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0040-4020
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📜 SIMILAR VOLUMES
Treatment of (lZ,3E)-cycloalkadienes with 2-vinyl-1,3-dioxolane under acidic conditions produced 1:l cycloadducts in which an intermediate ally1 cation added to the dienes to give tram-fused cyclobutanes as the major products.
Despite an extensive literature, controversy about the Diels-Alder reaction mechanism still exists. For the thermal dimerization of 1,3-butadiene, for example, a concerted one-step [I] or two-stage [2] mechanism, a mixture of orbital symmetry allowed and forbidden cycloadditions 131, as well as a tw