## Abstract For Abstract see ChemInform Abstract in Full Text.
Allylation-Assisted Addition of Nitromethane to 2H-1-Benzopyran-2-ones Substituted in Position 3
✍ Scribed by Bojilova, Anka ;Kostadinova, Todorka ;Ivanov, Christo
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 243 KB
- Volume
- 1989
- Category
- Article
- ISSN
- 0947-3440
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## Abstract 3‐Pivaloyl‐2__H__‐1‐benzopyran‐2‐one (6) reacts with acid anhydrides in the presence of triethylamine to give 4‐(2‐oxoalkyl)‐2‐oxochromans 7 and 3‐pivaloyl‐2‐oxochroman (8) in moderate yields. Also 3‐propionyl‐ and 3‐isobutyryl‐2__H__‐1‐benzopyran‐2‐ones (9) react with acid anhydrides u
## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract C(α)‐Carboxylic acid esters were treated with excess lithium diisopropylamide, condensed with methyl salicylates or methyl thiosalicylate, followed by acid cyclization to either 4‐hydroxy‐3‐substituted, 2__H__‐1‐benzopyran‐2‐ones (coumarins), or 2__H__‐1‐benzothiopyran‐2‐ones (thiocouma