1.3- Dihydroxy-2-imino-dihydro

Ar-quinolin-2-yl)imino]propionates by injection or sublimation at 530°C yielded a mixture of 3-amino- and 3-ethoxy-l//-pyrimido[l,2-rz]quinolin-l-ones <2004AJC577>. An oxidative cascade for the biomimetic formation of the pyoverdine chromophore was supported by incubation of 2-[(4-hydroxyphenyl)- and 2-[(2-(3,4-dihydroxipheny-l)ethyl]-l,4,5,6-tetrahydropyrimidines with polyphenol oxidase or Pseudomonas extract to afford a mixture of 8,9-dihydroxy-2,3-dihydro- and -2,3,5,6-tctrahydro-l //-pyrimido[ 1,2- ]quinolines <20030L2215>. Oxidation of 2-[(2-(3,4-dihydroxiphenyl)ethyl]-l,4,5,6-tetrahydropyrimidine with MnOz gave a similar result. 

Furan 2-[2-(bzw. 3 bzw.4)-Chlor-phenyl]-3,4-dihydroxy-5-imino-2,5-dihydro- VI/2, 698 f. Isocyanat (2-Chlor-l-phenyl-ethoxycarbonyl)- E4, 1244 (Cl —CO —NCO +- Oxiran) Quinolin 8-Chlor-4-methyl-2,5,6-trihydroxy- VI/lc, 624... 

Furan 3,4-Dihydroxy-5-imino-2-(3-nitro-phenyl)-2,5-dihydro- VI/2, 698 f. 

Amino-4-hydroxy-8-methyl- E19d, 689 (aus 1,3-Oxazol-Der.) 7-Aminoxy-4-methyl- El 6a, 264 Furan 3,4-Dihydroxy-5-imino-2-phenyl-2,5-dihydro- VI/2, 698 Glyoxylsaure (3,4-Dimethoxy-phenyl)- -nitril E13/2, 1158 (Alkohol - Keton)... 

H-Chroraon 7-Aminoxy-4,8-di-methyl- E16a, 259 (O-Umarylier.) 1,3,4-Dioxazol 2-(2-Oxo-propyl)-5-phenyl- E14a/1, 321 (R-CO-NH-OH + En —Cl) Furan 3.4-Dihydroxy-5-imino-2-(4-met hy l-phenyl)-2,5-dihydro-VI/2, 698 f. 

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