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2005
Fused pyridine derivatives
R 0450
Condensed Isoquinolines. Part 16. Enamine Properties of Benzo[4,5]imidain Terms of Its Acylation Reactions. — The acy07- 139 zo[1,2-b]isoquinolin-11(5H)-one
lation direction of the title compounds (I) depends on the nature of the carboxylic acid
chloride (II) used leading either to C6-acylation products (III) or to a mixture of compounds (III) with N5-acylation products (IV). The cyclization of compound (IIIb) in
the presence of iPr-ONa is accompanied by fission at the N6-C7 bond, while the use of
NEt3 allows to prepare the desired cyclopentafluorene (VII) in good yield. The reaction
of compound (I) with Ar-NCO gives rise to the 6-carbamoyl derivatives (X), whereas
the analogous reaction with Ph-NCS leads unexpectedly to the dimeric product (XI).
— (POTIKHA, L. M.; SHKILNA, N. V.; KISIL, V. M.; KOVTUNENKO, V. O.;
Chem. Heterocycl. Compd. (N. Y.) 40 (2004) 5, 603-615; Taras Shevchenko Kiev.
Natl. Univ., Kiev 252601, Ukraine; Eng.) — R. Staver
2005
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