3-Phenyl-and 3-(p-methoxyphenyl)-7,8-dihydroxy and -6,7-dihydroxychromenones were prepared from ethyl 3-oxo-2-phenylpropanoate, ethyl 3-oxo-2-(4-methoxyphenyl)-propanoate and the trihydroxy benzenes in H 2 SO 4 . 3-Aryl-7,8-and3-aryl-6,7-dihydroxy-2H-chromenones reacted with the bis-dihalides of pol
Synthesis of Novel Mannose-Based Crown Ethers.
✍ Scribed by A. Rathjens; J. Thiem
- Publisher
- John Wiley and Sons
- Year
- 2005
- Weight
- 8 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0931-7597
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## Abstract Starting from ethyl propionylacetate, and ethyl 2‐ethylacetoacetate we prepared 4‐propyl‐7,8‐, 4‐propyl‐6,7‐, 3‐ethyl‐4‐methyl‐7,8‐ and 3‐ethyl‐4‐methyl‐6,7‐dihydroxy‐2__H__‐chromenones which were allowed to react with the bis‐dihalides or ditosylates of glycols in DMF/Na~2~CO~3~ to aff