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http://dx.doi.org/10.5012/bkcs.2014.35.12.3453

Facile Synthesis of Natural Moracin Compounds using Pd(OAc)2/P(tBu)3-HBF4 as a Sonogashira Coupling Reagent  

Lee, Jae Jun (Department of Chemistry and Institute of Applied Chemistry, Hallym University)
Yun, So-Ra (Department of Chemistry and Institute of Applied Chemistry, Hallym University)
Jun, Jong-Gab (Department of Chemistry and Institute of Applied Chemistry, Hallym University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.12, 2014 , pp. 3453-3458 More about this Journal
Abstract
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 $Pd(OAc)_2/P(^tBu)_3-HBF_4$ 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 $Pd(OAc)_2/P(^tBu)_3-HBF_4$ 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.
Keywords
Moracin; Sonogashira reaction; Benzofuran; $Pd(OAc)_2/P(^tBu)_3-HBF_4$; Morus alba Linn;
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