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- W2952331161 abstract "A concise stereocontrolled synthesis of the racemic forms of two naturally occurring lignans, savinin (5) and gadain (6), is described. The reaction sequences used for the preparation of these lignans involve: (i) a regioselective and stereospecific Pd-mediated reaction between (3,4-methylenedioxy)phenylzinc chloride (15a) and the easily available methyl (Z)- and (E)-2,3-dibromopropenoate [(Z)- and (E)-(14)], respectively; (ii) a Pd-mediated reaction between the 3-aryl substituted 2-propenylzinc chloride (17) and the stereoisomerically pure 3-aryl-2-bromopropenoates (Z)- and (E)-16, respectively, so obtained; and (iii) treatment of the resulting dienyl esters (E)- and (Z)-18, with dicyclohexylborane followed by oxidation with 30% H2O2 in the presence of alkali and subsequent lactonization." @default.
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- W2952331161 date "1997-09-01" @default.
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- W2952331161 title "A New Stereocontrolled Synthesis of the Racemic Forms of Savinin and Gadain" @default.
- W2952331161 doi "https://doi.org/10.1055/s-1997-1299" @default.
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