One-step furan ring formation: Synthesis
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Masahiro Fujita; Hiroshi Egawa; Katsumi Chiba; Jun-Ichi Matsumoto
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Article
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1997
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Journal of Heterocyclic Chemistry
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English
⚖ 363 KB
## Abstract The one‐pot reaction of ethyl 1‐cyclopropyl‐6,7,8‐trifluoro‐1,4‐dihydro‐4‐oxoquinoline‐3‐carboxylate (6) with __tert__‐butyl acetoacetate gave 3‐__tert__‐butyl 7‐ethyl 9‐cyclopropyl‐4‐fluoro‐6,9‐dihydro‐2‐methyl‐6‐oxofuro[3,2‐__h__]quinoline‐3,7‐dicarboxylate (5). This regioselective cy