open access

https://hdl.handle.net/2115/81057

Friedel−Crafts‐Type Allylation of Phenol Derivatives Catalyzed by In Situ‐Generated Silyl Cyanometallates

英語

Pd catalyst

2020-04

Wiley

Asian Journal of Organic Chemistry

9(4)

557-560

We successfully demonstrated that Friedel−Crafts‐type allylation of phenol derivatives and allylic phosphates is catalyzed by the AgTFA/trimethylsilyl cyanide (Me3SiCN) and Pd(OAc)2/Me3SiCN combined systems to afford the C‐allylated product in a highly regioselective manner. The corresponding silyl cyanometallates generated in situ are proposed to be the active catalytic species. Lewis acidity of the reversibly formed ion pairs is appropriately regulated for this reaction. The para‐allylated anisole and phenol derivatives are selectively obtained. The para‐substituted ones are converted to the ortho‐allylated products. The reactivity of the catalytic systems is strongly dependent on the electronic nature of both electrophile and nucleophile. Substitution of an aromatic ring on the allylic phosphate is essential for the reaction. Thus, the competitive reaction of a 1 : 1 mixture of cinnamyl and simple allyl phosphates affords only the cinnamyl‐substituted product.

学術雑誌論文

Accepted Manuscript

This is the peer-reviewed version of the following article: T. Yurino, H. Ece, T. Ohkuma, Asian J. Org. Chem. 2020, 9, 557. , which has been published in final form at https://doi.org/10.1002/ajoc.202000023. This article may be used for non-commercial purposes in accordance with Wiley-VCH Terms and Conditions for Self-Archiving.

2193-5807

2193-5815