An Efficient Method for the Synthesis of New Non‐Symmetrical Naphthalenediimides

Herein we report an efficient synthesis of a series of non‐symmetrical naphthalenediimides (NDIs) bearing different neutral, electron‐donating and electron‐withdrawing groups in the imide moieties. The success of this method is based in the regioselective synthesis and isolation of pure carbamoyl naphthoic anhydride acid intermediates (CNA) in good yields (54 to 99%) and high purity, from the reaction of naphthalenetetracarboxylic dianhydride acid (NDA) with one equivalent of different primary amines and THF as solvent. The CNA intermediates were refluxed in toluene and gave the naphthalenemonoimides (NMI) in 55 to 89% yields and high purity. The N‐benzyl NMI was used as starting material in the synthesis of non‐symmetrical NDIs (1 a‐m) in 27 to 80% yield with several amines bearing different substituted benzylic groups. In addition, this methodology was extended to obtain other new NDIs (1 n‐r) in good yields (67‐90%) and purity. Efficient synthesis of new symmetrical and non‐symmetrical naphthalenediimides bearing different neutral, electro‐donating and electro‐withdrawing substituents using a in solution protocol of synthesis under mild conditions.