An efficient and practical synthesis of natural moracins, which have diverse range of biological properties including anticancer, antioxidant, and antibacterial activities, has been achieved using Pd(OAc) 2 /P( t Bu) 3 -HBF 4 as a Sonogashira coupling reagent which solved the unreactive problems in case of higher electron density of haloaryl compounds in the reaction. Lowering electron density of halophenol with acetylation and changing Sonogashira coupling reagent from PdCl 2 (PPh 3 ) 2 to Pd(OAc) 2 /P( t Bu) 3 -HBF 4 smoothly produce the benzofuran structures in the syntheses of moracins M, N and S. The electron deficient halobenzaldehyde, however, easily forms the benzofuran using original Sonogashira conditions, and utilized for the first synthesis of moracin Y.
Diversity oriented synthesis of natural 2‐arylbenzofuran, moracin F (1) has been carried out from the commercially available starting materials using Sonogashira coupling, Suzuki coupling, neutral Al2O3
mediated cyclization, and intramolecular Wittig reaction as key steps.
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