## Abstract For Abstract see ChemInform Abstract in Full Text.
Preparation of optically active (acyloxy)alkyl esters from optically active O-acyl-α-hydroxy acids
✍ Scribed by Peter R Guzzo; Sean R Dinn; Jianhui Lu; Stefanie Oettinger-Loomis
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- French
- Weight
- 79 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Acyloxy)alkyl esters are commonly employed as prodrugs of carboxylic acid containing compounds. Several optically active (acyloxy)alkyl esters are prepared from a coupling and rearrangement reaction between optically active O-acyl-a-hydroxy acids and 3-chloroperoxybenzoic acid mediated by diisopropylcarbodiimide. The effect of temperature and solvent on the reaction is discussed. An application of the reaction to prepare a prodrug form of ibuprofen is described.
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A new method of preparation of optically active a-hydroxy ketone derivatives has been developed. Incubation of (Z)-3-propionyloxy4-benzyloxy-2-pentcne (la) with lipasc OF gave optically pure (R)-cnol propionatc la, which in bun was converted without raccmization to @)-ketone 2a by the aid ofLiAlH4.
There have been developed several kinds of asymmetric syntheses for preparing optically active a-hydroxy acids, ') and high optical induction(>80% e.e.) can be successfully achieved by selecting chiral sources lb) or by