The unprecedented triarylcarbonium ion-pair-catalyzed Pictet–Spengler reaction of tryptamines with aromaticaldehydes and cyclic ketones in water was disclosed. Under metal-free conditions, diverse tetrahydro-β-carbolines and spirocyclic tetrahydro-β-carbolines were obtained in good yields with excellent functional group tolerance, including late-stage modification of natural products and small molecular
Studies toward the Photochemical Synthesis of Functionalized [5]- and [6]Carbohelicenes
作者:Morwenna S. M. Pearson、David R. Carbery
DOI:10.1021/jo900785k
日期:2009.8.7
An efficient route to nonsymmetrical helical menthyl esters by means of an oxidative photocyclization reaction of dissymmetric bis-stilbenes is reported. The developed route allows the introduction of functionality on rings A, E, or F, and the influence of the substituent pattern on the photochemical reaction has been examined. Diastereoselectivity is observed when a double chiral induction strategy
Hydride Transfer Enables the Nickel‐Catalyzed
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‐Borylation and Silylation of Aldehydes
作者:Watchara Srimontree、Lin Guo、Magnus Rueping
DOI:10.1002/chem.201904842
日期:2020.1.7
silylations of aldehydes are described for the first time. The new functional-group interconversion protocol is characterized by its scalability, functional-group tolerance and wide substrate scope, including examples of late-stage functionalization of complex molecules. The key for the successful reaction outcome is the use of a ketone as a hydride acceptor that intercepts the nickel hydride to undergo
Oxidative Dehydrogenative [3+3] Annulation of Benzylhydrazines with Aziridines Leading to Tetrahydrotriazines
作者:Haitao Li、Jia Liang、Congde Huo
DOI:10.1002/cjoc.201900214
日期:2019.9
Oxidative dehydrogenative [3+3] annulation of benzylhydrazines with N‐sulfonylaziridines is described. A series of complex tetrahydro‐1,2,4‐triazines were produced under mild reaction conditions.
Efficient annulation of in situ formed azaoxyallyl cations using a base has been accomplished with diaziridines to provide 1,2,4-triazines at room temperature. The substrate scope, scale up, functional group tolerance and transition-metal free reaction conditions are the important practical features.