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2005
Fused pyridine derivatives
R 0450
Novel Heterocyclic Systems. Synthesis of 2,7-Dimethyl-10-oxa-1,8-diaza-anthraand Derivatives. — New heterocycles (III) and (IX) are prepared by a route
14- 159 cen-9-one
involving a dehydrative-cyclization strategy that avoids the use of a strongly acidic reaction medium and employs Ni(cod)2 instead. In addition, the method applied to perform ring closure of the tethered triflate moieties present in (VI) to give target indolizinium compound (IX) is extended to the formation of the novel zwitterionic heterocycle
(XIV) from pyridine (X). — (GOTCHEV, D. B.; COMINS*, D. L.; Tetrahedron 60
(2004) 51, 11751-11758; Dep. Chem., N. C. State Univ., Raleigh, NC 27695, USA;
Eng.) — Klein
2005
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