A six-step totalsynthesis of the azaphenanthrene alkaloid eupolauramine 1 has been achieved using combinational metalation-cyclization tactics. The synthetic route involved first the construction of the azaisoindolinone 9 by aryne-mediated cyclization of he phosphorylated pyridocarboxamide 7 and subsequent dephosphorylation. Metalation of 9 followed by connection of the hydroxybenzyl appendage and
Pyridine-3,4-dicarboximide as starting material for the total synthesis of the natural product eupolauramine and its isomer iso-eupolauramine endowed with anti-tubercular activities
of the key intermediate aza-isoindolinone 4a/4b, which could be ready obtained from pyridine-3,4-dicarboximide was described. This approach was valorized in the totalsynthesis of the natural product eupolauramine 7b and in the first synthesis of the position analog iso-eupolauramine 7a, which was obtained after 6 steps in an overall yield of 13%. The developed strategy represents the first synthetic