Synthesis of oligopyrrolic cluster bearing thiophene spacer as potential anion receptors
摘要:
The oligopyrrolic clusters and tripyrrylmethane have been synthesized and characterized by the utilization of 2-formylpyrroles and their derivatives as building blocks. Condensation of dialdehydes 9 with pyrrole in the presence of BF3(Et2O) resulted in the formation of tripyrrlymethane 10, while similar condensation performed in trifluoroacetic acid afforded oligopyrrolic cluster 11 on the other hand. The nature of substituents at meso-positions resulted in the formation of completely different products. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis of pseudoaromatic expanded porphyrin analogues
摘要:
Optically active expanded porphyrins bearing thiophene were synthesized by Schiff base forming reaction. The condensation of thiophene containing 1,14-bisformyl tripyrrane with aromatic diamines Failed to give desired macrocycles but condensation with aliphatic 1,2-diamines gave the desired products. The macrocycles synthesized tend to maintain 18 pi system and the ethylene bridge shows somewhat resistance toward oxidation. (C) 1999 Elsevier Science Ltd. All rights reserved.