Synthesis and properties of C(10) isopropyl and isopropylidene analogs of bilirubin
摘要:
Analogs of bilirubin with isopropyl (1) and isopropylidene (2) groups attached to the central C(10) carbon were synthesized and evaluated by a combination of NMR, UV-vis and circular dichroism spectroscopy and molecular dynamics calculations. These methods and H-1{H-1}-homonuclear Overhauser effect (NOE) experiments in CDCl3 solutions indicate that the rubins' carboxylic acid groups are tethered to the dipyrrinone lactams and/or pyrroles by intramolecular hydrogen bonds and confirm that the pigments adopt a folded, ridge-tile shape in solution. (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis and properties of C(10) isopropyl and isopropylidene analogs of bilirubin
摘要:
Analogs of bilirubin with isopropyl (1) and isopropylidene (2) groups attached to the central C(10) carbon were synthesized and evaluated by a combination of NMR, UV-vis and circular dichroism spectroscopy and molecular dynamics calculations. These methods and H-1{H-1}-homonuclear Overhauser effect (NOE) experiments in CDCl3 solutions indicate that the rubins' carboxylic acid groups are tethered to the dipyrrinone lactams and/or pyrroles by intramolecular hydrogen bonds and confirm that the pigments adopt a folded, ridge-tile shape in solution. (C) 1998 Elsevier Science Ltd. All rights reserved.