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1999 fused pyridine derivatives fused pyridine derivatives R 0450 43 - 143 A Chemical Evidence of Regiochemistry in the Diels–Alder Re- action of 4-Oxygenated Quinolinequinones with 1-Methoxy-3- trimethylsilyloxy-1,3-butadienes. — The Diels–Alder reaction of 4-oxygenated 6-bromo- and 7-bromoquinolinequinones such as (I) and (IV) proceeds completely regioselectively to yield the corresponding regioisomeric azaanthraquinones (III) and (V). These results confirm the regiochemistry in Diels–Alder reactions of the corresponding non-halogenated quinolinones in a chemical mean. — (HORIGUCHI, YOSHIE; TOMODA, KATSUHIRO; SANO, TAKEHIRO; Heterocycles 51 (1999) 7, 1669-1680; Showa Coll. Pharm. Sci., Machida, Tokyo 194, Japan; EN) 1

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Page 1: ChemInform Abstract: A Chemical Evidence of Regiochemistry in the Diels—Alder Reaction of 4-Oxygenated Quinolinequinones with 1-Methoxy-3-trimethylsilyloxy-1,3-butadienes

1999 fused pyridine derivatives

fused pyridine derivativesR 0450

43 - 143A Chemical Evidence of Regiochemistry in the Diels–Alder Re-action of 4-Oxygenated Quinolinequinones with 1-Methoxy-3-trimethylsilyloxy-1,3-butadienes. — The Diels–Alder reaction of4-oxygenated 6-bromo- and 7-bromoquinolinequinones such as (I) and (IV)proceeds completely regioselectively to yield the corresponding regioisomericazaanthraquinones (III) and (V). These results confirm the regiochemistry inDiels–Alder reactions of the corresponding non-halogenated quinolinones ina chemical mean. — (HORIGUCHI, YOSHIE; TOMODA, KATSUHIRO;SANO, TAKEHIRO; Heterocycles 51 (1999) 7, 1669-1680; Showa Coll. Pharm.Sci., Machida, Tokyo 194, Japan; EN)

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