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Synthetic analogs of natural flavolignans VIII. Synthesis of 6-chloro-1,3-benzodioxane, 1,4-benzodioxane, 1,5-benzodioxepane, and 1,6-benzodioxocane analogs of 4-thioflavone

✍ Scribed by A. Aitmambetov; G. Berdimbetova; V. P. Khilya


Publisher
Springer
Year
1997
Tongue
English
Weight
141 KB
Volume
33
Category
Article
ISSN
0009-3130

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## Abstract Alkylation of 6,7‐difluoro‐4‐hydroxyquinoline‐3‐carboxylic acid ethyl ester with substituted‐benzyl chlorides gave 1‐(substituted‐benzyl)‐6,7‐difluoro‐1,4‐dihydro‐4‐oxoquinoline‐3‐carboxylic acid ethyl esters. Their treatment with piperazine or __N__‐methylpiperazine in pyridine yielded