Importance of Off-Cycle Species in the Acid-Catalyzed Aza-Piancatelli Rearrangement

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• 作者：Diana Yu ; Van T. Thai ; Leoni I. Palmer ; Gesine K. Veits ; Jonathan E. Cook ; Javier Read de Alaniz ; Jason E. Hein
• 刊名：Journal of Organic Chemistry
• 出版年：2013
• 出版时间：December 20, 2013
• 年：2013
• 卷：78
• 期：24
• 页码：12784-12789
• 全文大小：363K
• 年卷期：v.78,no.24(December 20, 2013)
• ISSN：1520-6904

文摘

The observed rate of reaction in the dysprosium triflate catalyzed aza-Piancatelli rearrangement is controlled by a key off-cycle binding between aniline and catalyst. Deconvoluting the role of these ancillary species greatly broadens our understanding of factors affecting the productive catalytic pathway. We demonstrate that the rate of reaction is controlled by initial competitive binding between the furylcarbinol and nitrogen nucleophile using either a Br酶nsted or Lewis acid catalyst and that the resulting rearrangement proceeds without involving the Br酶nsted and Lewis acid catalyst. This shows conclusively that the rate-controlling step and selectivity of reaction are decoupled.