We were impressed by the fact that such structurally dissimilar alkaloid families as the Strychnos, Aspidosperma, Senecio, Amaryllidaceae, and Tobacco all incorporate various perturbations of the pyrrolidine ring system [3]. Reasoning that any potentially general synthetic adventure into this vast a
Thermal rearrangement of cyclopropyl imines. : II. Synthesis of a mesembrine model
β Scribed by R.V. Stevens; Mark P. Wentland
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- French
- Weight
- 121 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
We recently reported (3) the total synthesis of the simple pyridine alkaloids myosmine [3] and apoferrorosamine [4] by means of the thermally induced, acid catalyzed, rearrangement of cyclopropyl ketimines [l]. The success and efficiency of these experiments has prompted us to further investigate the crucial rearrangement step, [l] to [2], as a general method of alkaloid synthesis. We wish now to report the synthesis of a model [5, R = H] of the Amarvllidaceae alkaloid mesembrine [5, R = OCH3].
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An efficient synthesis of oxindoles is achieved from a thermal and rhodium(H)-catalyzed Wolff rearrangement of diazoquinolinediones in moderate yields, 0 1999 Elsevier Science Ltd. All rights reserved. Oxindoles and their derivatives are very important compounds as synthetic intermediates of natura