Enantiopure Ξ±-alkylidenelactones 7 were prepared by a Michael-like addition and ring-chain transformation affording optically active 4-(Ο-hydroxyalkyl)pyrazolidin-3-Wittig reaction from Ξ±-bromolactones 4 and chiral aldehydes 6. Compounds 7 react with hydrazines 9 by stereoselective ones 11.
Synthesis of 4-(3-Hydroxyalkyl)pyrimidines by Ring Transformation Reactions of 2-Alkylidenetetrahydrofurans with Amidines.
β Scribed by Esen Bellur; Peter Langer
- Publisher
- John Wiley and Sons
- Year
- 2006
- Weight
- 35 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0931-7597
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π SIMILAR VOLUMES
The configuration and/or formulae of the following compounds need to be corrected. (1ΠR,E)-3-(2-Benzyloxy-3-hydroxypropylidene)dihydrofuran-2-one (7c): Correct formula: (4S,5R,4ΠS)-5-(2,2-Dimethyl[1,3]dioxolan-4-yl)-4-(2-hydroxyethyl)pyrazolidin-3-one (11a): Original formula correct (4R,5S,1ΠR)-5-(1
Synthesis of Chiral 4-(Ο-Hydroxyalkyl)pyrazolidin-3-ones by Ring-Chain Transformation of Ξ±-Alkylidenelactones with Hydrazines. -This is the first access to optically active 4-(Ο-hydroxyalkyl)pyrazolidin-3-ones. The lactone (IX), however, cannot be transformed into the corresponding pyrazolidinone.