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2005
Pyrazine derivatives
R 0550
Fused Polycyclic Nitrogen—Containing Heterocycles. Part 11. 4-Hyas New Key Compounds in the
34- 221 droxy-3,5-diphenyl-2-phenyliminothiazolidines
Synthesis of Thiazolo[3,4-a]quinoxaline Derivatives. — Synthesis of title thiazoloquinoxalines (III) and (V) is smoothly achieved by cyclocondensation of aryliminothiazolidinecarboxylates with phenylenediamines in acetic acid. Interesting regioselectivities are achieved for unsymmetrically substituted phenylenediamines (IIc) and (IId).
A plausible reaction mechanism is presented. — (MAMEDOV*, V. A.;
NURKHAMETOVA, I. Z.; KOTOVSKAYA, S. K.; GUBAIDULLIN, A. T.; LEVIN,
Y. A.; LITVINOV, I. A.; CHARUSHIN, V. N.; Russ. Chem. Bull. 53 (2004) 11,
2568-2576; Arbuzov Inst. Org. Phys. Chem., Kazan Res. Cent., Russ. Acad. Sci.,
Kazan' 420088, Russia; Eng.) — Mischke
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