DOUBLYN-CONFUSED CALIX[4]PYRROLE PREPARED BY RATIONAL SYNTHESIS
摘要:
Doubly N-confused calix[4]pyrrole 4 is prepared in high yield by the [3 + 1] condensation of tripyrrane 3 with 2,4-dihdoxymethylpyrrole 2 under acid-catalysed conditions.
A variety of internally N-alkylated N-confused porphyrins were prepared in a stepwise manner through the protection of the reactive peripheral nitrogen atom. NH-Tautomerism in N-confused porphyrins was found to be regulated by N-alkylation, which enabled us to obtain discrete information on two important NH-tautomers of an N-confused porphyrin.
graphicb-Unsubstituted meso partially free N-confused porphyrin, N-confused 5,20-diphenylporphyrin (NCDPP, 3), was synthesized in 7% yield by [3 + 1] condensation reaction followed by oxidation. The structures of the free base and its Ag(III) complex were elucidated by the single-crystal X-ray analyses. The Ag(III) complex was more planar than the free base and formed columnar structures stacking to each other with a 3.3 Angstrom distance in the crystal.