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Two functionalized pentacyclic compounds 12a, 12b were constructed via a highly efficient synthetic route, employing a tricyclic amino aldehyde as the key intermediate. The crucial steps involved coupling of two segments via amide bond, Swern oxidation and intramolecular Pictet-Spengler cyclization.
The crucial steps involved coupling of two segments via amide bond, Swern oxidation and intramolecular Pictet-Spengler cyclization.