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2005
Isoxazole derivatives
R 0240
Synthesis of 3- and 5-Amino-5-(3)-(pyrrol-2-yl)isoxazoles. — 5-Aminoisoxazoles
are selectively prepared by the reaction of dicyanopyrrole (I) with hydroxylamine
35- 141 (II)
in methanol. Their structural isomers, 3-aminoisoxazoles (V) are available via reaction
of carbamoylcyanopyrroles (III) with hydroxylamine in the presence of aqueous NaOH
and from (VI), obtained by intramolecular cyclization of (III) and hydroxylamine. —
(SOBENINA*, L. N.; DRICHKOV, V. N.; MIKHALEVA, A. I.; PETROVA, O. V.;
USHAKOV, I. A.; TROFIMOV, B. A.; Tetrahedron 61 (2005) 20, 4841-4849; A. E.
Favorsky Inst. Chem., Sib. Branch, Russ. Acad. Sci., Irkutsk 664033, Russia; Eng.)
— Bartels
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