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2004
Fused pyridine derivatives
R 0450
Intramolecular [4 + 2] Cycloaddition Reactions of Indolylalkylpyridazines: Synof Annulated Carbazoles. — The inverse-electron-demand intramolecular
47- 133 thesis
Diels—Alder cycloaddition of mono and bicyclic 1,2-diazines, tethered to indole
dienophiles by alkylene chains, is reported. Whereas unactivated pyridazines undergo
the cycloaddition reaction only very sluggishly, more electron-deficient pyridazines
like (Ib) and (Id) react considerably faster and give higher yields of carbazole products.
— (HAIDER*, N.; KAEFERBOECK, J.; Tetrahedron 60 (2004) 31, 6495-6507; Inst.
Pharm. Chem., Univ. Wien, A-1090 Wien, Austria; Eng.) — Bartels
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