The direct synthesis of 5,7-dihydroxy-6-methoxyflavones I. synthesis of 4′,6-dimethoxy-3′,5,7-trihydroxyflavone and pectolinarigenin.
✍ Scribed by L. Farkas; J. Strelisky
- Publisher
- Elsevier Science
- Year
- 1970
- Tongue
- French
- Weight
- 213 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
So far one has only succeded in synthetising 5.7~dihydroxy-6-methoxyflavonea
bearing not more than one substituent on the phenyl side Aain /B-ring/ l-9. b tried to solve this problem by alkaline ring isomerization 10-12.
📜 SIMILAR VOLUMES
The above mentioned compounds have been prepared by methods involving isomeric change from the more readily available 5,7,&substituted isoflavones.
## Abstract Fusion of an azole moiety at C‐6 and C‐7 of naltrexone (1) is illustrated by the synthesis of the title compound 8. Bromination of 3‐__O__‐methylnaltrexone led to the 1,7α‐dibromo derivative which reacted with thiourea to attach the 2‐aminothiazole ring to C‐6 and C‐7 of naltrexone. Aft
## Abstract ( ± )‐5,5″‐Dihydroxy‐7,7″‐dimethoxy‐8,8″‐biflavone (( ± )‐l) was resolved into its optically pare forms __via__ the formation and recrystallization of its (2__R__)‐ and (2__S__)‐1‐(4‐toluenesulfonyl)prolylate, and the methylated derivatives of (+)‐ and (‐)‐1 were also prepared. The abso