Modified substrates for tetrapyrrole biosynthesis: analogues of porphobilinogen showing unusual inhibition of porphobilinogen deaminase
作者:Finian J. Leeper、Martin Rock
DOI:10.1039/c39920000242
日期:——
Syntheses are described of two analogues of porphobilinogen (PBG), a fluoro derivative 10 and a phosphonate 13, which are the first known unnatural substrates of PBG deaminase; when they act as inhibitors of the reaction of PBG, these compounds produce unusual sigmoidal kinetics, explained by their involvement as poor substrates in the particular mechanism of this enzyme.
Syntheses are described of several analogues of porphobilinogen intended as substrates and/or inhibitors of porphobilinogen deaminase (hydroxymethylbilane synthase). 2-Methylporphobilinogen 12 has been synthesised from α-methylpyrrole 6, whereas a phosphonate analogue 20 of porphobilinogen, 8,9-didehydroporphobilinogen 26 and 9-fluoroporphobilinogen 38 have all been made from the 1H-pyrrolo[2,3-c]pyridine 14. The best route to 38 avoids fluoroacrylate 28 because of loss of fluorine during reduction of the double bond.