Practical, Large-Scale Preparation of Benzoxepines and Coumarins through Rhodium(III)-Catalyzed C-H Activation/Annulation Reactions
Herein we disclose the assembly of benzoxepines and coumarins from 2-alkenylphenol precursors using [Cp*RhCl2]2 as the precatalyst and alkynes or carbon monoxide as reacting partners. The preparation of benzoxepines and coumarins can be scaled up to 33 mmol using low catalyst loadings.
Gulías, Moisés,Marcos-Atanes, Daniel,Mascare?as, José L.,Font, Marc
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p. 1669 - 1673
(2019/09/04)
Synthesis of 8-aryl-substituted coumarins based on ring-closing metathesis and Suzuki-Miyaura coupling: Synthesis of a furyl coumarin natural product from Galipea panamensis
The synthesis of 7-methoxy-8-(4-methyl-3-furyl)-2H-chromen-2-one, a natural product with antileishmanial activity recently isolated from the plant Galipea panamensis, is described. The key step is a Suzuki-Miyaura coupling of a furan-3-boronic acid and an