synthesis of elaborate benzofuran-2-carboxamide derivatives through a combination of 8-aminoquinoline directed c–h arylation and transamidation chemistry

synthesis of elaborate benzofuran-2-carboxamide derivatives through a combination of 8-aminoquinoline directed c–h arylation and transamidation chemistry

;Michael Oschmann;Linus Johansson Holm;Monireh Pourghasemi-Lati;Oscar Verho
Journal of ethnopharmacology 2020 Vol. 25 pp. 361-
163
oschmann2020moleculessynthesis

Abstract

Herein, we present a short and highly modular synthetic route that involves 8-aminoquinoline directed C−H arylation and transamidation chemistry, and which enables access to a wide range of elaborate benzofuran-2-carboxamides. For the directed C−H arylation reactions, Pd catalysis was used to install a wide range of aryl and heteroaryl substituents at the C3 position of the benzofuran scaffold in high efficiency. Directing group cleavage and further diversification of the C3-arylated benzofuran products were then achieved in a single synthetic operation through the utilization of a one-pot, two-step transamidation procedure, which proceeded via the intermediate N-acyl-Boc-carbamates. Given the high efficiency and modularity of this synthetic strategy, it constitutes a very attractive method for generating structurally diverse collections of benzofuran derivatives for small molecule screening campaigns.

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167717
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10.3390/molecules25020361
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