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2005
Fused pyridine derivatives
R 0450
Efficient Approach to the Unknown Isoxazolo[3,4-d]thieno[2,3-b]pyridine System
Regioselective Intramolecular Nitrone Cycloadditions. — Thienyl-tethered ni31- 144 by
trones generated from aldehydes (VIII) undergo 1,3-dipolar cycloaddition reaction to
give the cis-fused title systems. Nitrones derived from (VIIIb) cannot be isolated due
to spontaneous cyclization. In the case of chiral nitrones, the diastereoselectivity of the
cycloaddition step is better for α-(hydroxymethyl)benzyl substituted nitrones than for
the methylbenzyl analogue. — (BROGGINI, G.; CHIESA, K.; DE MARCHI, I.;
MARTINELLI, M.; PILATI, T.; ZECCHI*, G.; Tetrahedron 61 (2005) 14, 3525-3531;
Dip. Sci. Chim. Ambientali, Univ. Insubria, I-22100 Como, Italy; Eng.) — Klein
2005
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