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Abstract

Decomposition of donor-acceptor diazo compounds leads to the formation of reactive carbene intermediates. These can undergo a wide variety of carbene transfer reactions to yield synthetically useful products. Herein, we report a selective borane catalyzed cyclization reaction from the combination of two different diazo compounds to afford N-substituted pyrazoles. The selective decomposition of the more reactive α-aryl α-diazoester and subsequent reaction with a vinyl diazoacetate produces N-alkylated pyrazoles in a regioselective manner. Catalytic amounts of tris(pentafluorophenyl)borane (10 mol%) were employed to afford the pyrazole products (36 examples) in yields from 59 to 80%. Extensive DFT studies have been undertaken to interpret the mechanism for this reaction which was found to go through two tandem catalytic cycles, both catalyzed by B(C6F5)3.

Item Type:	Article
Authors/Creators:	Dasgupta, A and Pahar, S and Babaahmadi, R and Gierlichs, L and Yates, BF and Ariafard, A and Melen, RL
Keywords:	borane catalysis, DFT calculations, diazo compounds, diazoester, pyrazole, carbene, tris(pentafluorophenyl)borane, Density Functional Theory
Journal or Publication Title:	Advanced Synthesis and Catalysis
Publisher:	Wiley-V C H Verlag Gmbh
ISSN:	1615-4150
DOI / ID Number:	https://doi.org/10.1002/adsc.202101312
Copyright Information:	2021 The Authors. Advanced Synthesis & Catalysis published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/) which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Related URLs:	Google Scholar: Yates, BF UTAS Profile: Yates, BF Google Scholar: Ariafard, A UTAS Profile: Ariafard, A
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