Reactions of muconaldehyde isomers with nucleophiles including tri-O-acetylguanosine: formation of 1,2-disubstituted pyrroles from reactions of the (Z,Z)-isomer with primary amines.
(Z,Z)-Muconaldehyde reacts with primary amines, including valine and lysine (epsilon-amino), to afford N-substituted-2-(oxoethyl)pyrroles, which were reduced with sodium borohydride to the more stable N-substituted-2-(hydroxyethyl)pyrroles. The formation of the pyrrole aldehydes was performed in a variety of solvents including aqueous methanol. With tri-O-acetylguanosine, the putative pyrrole aldehyde derived from reaction at NH2 condenses with N-1 (guanine component) to afford a bicyclic adduct: 4,5-dihydro-5-hydroxy-10-beta-D-tri-O- acetylribosylpyrrolo[1',2':3,4]pyrimido[1,2-a]purin-7(10H)-one (5a). This was hydrolyzed to 4,5-dihydro-5-hydroxy-10-beta-D- ribosylpyrrolo[1',2':3,4]pyrimido[1,2-a]purin-7(10H)-one (5b). The structures of 5a and 5b were primarily based on NMR evidence and comparison with 4,5-dihydro-5-hydroxy-9-methylpyrrolo[1',2':3,4]pyrimido[2,1-b] pyrimidin-7-one (7), obtained from reacting (Z,Z)-muconaldehyde with 2-amino-4-hydroxy-6-methylpyrimidine. (E,Z)-Muconaldehyde also reacted with primary amines to give N-substituted-2-(oxoethyl)pyrroles, whereas (E,E)-muconaldehyde gave bis-imines. The results described are discussed in the context of the carcinogenicity of benzene.
Bleasdale
C
C
Department of Chemistry, University of Newcastle upon Tyne, U.K.
Golding
B T
BT
Kennedy
G
G
MacGregor
J O
JO
Watson
W P
WP
D000447:Aldehydes / Q000138:chemical synthesis / Q000737:chemistry*; D000588:Amines / Q000737:chemistry*; D000596:Amino Acids / Q000737:chemistry; D006151:Guanosine / Q000031:analogs & derivatives* / Q000737:chemistry; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D000432:Methanol / Q000737:chemistry; D011758:Pyrroles / Q000138:chemical synthesis*; D012997:Solvents; D014867:Water / Q000737:chemistry
D000447:Aldehydes; D000588:Amines; D000596:Amino Acids; D011758:Pyrroles; D012997:Solvents; D014867:Water; D006151:Guanosine; C034476:muconaldehyde; C031872:triacetylguanosine; D000432:Methanol