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2005
Pyrazine derivatives
R 0550
Regioselective One-Pot Synthesis of 9-Alkyl-6-chloropyrido[3,2-e][1,2,4]triReactivity of Aliphatic and Aromatic Hydrazides. — A
34- 219 azolo[4,3-a]pyrazines.
new method to prepare the title pyrazines is reported. However, the reaction with aromatic hydrazides and electron-withdrawing substituted aliphatic hydrazides results in
formation of keto analogues such as (VI) and (VIII). In the presence of an excess of
hydrazide, tetracyclic systems like (IV) are obtained. — (UNCITI-BROCETA, A.;
PINEDA-DE-LAS-INFANTAS, M. J.; DIAZ-MOCHON, J. J.; ROMAGNOLI, R.;
BARALDI, P. G.; GALLO, M. A.; ESPINOSA*, A.; J. Org. Chem. 70 (2005) 7,
2878-2880; Dep. Quim. Org., Fac. Farm., Univ. Granada, E-18071 Granada, Spain;
Eng.) — Jannicke
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