## Abstract The anodic oxidation of (±)‐1,2‐__O__‐isopropylideneglycerol at a silver/silver oxide electrode with a controlled potential of +0.9 V vs. SCE in 2.5 N sodium hydroxide affords sodium (±)‐2,3‐__O__‐isopropylideneglycerate in a yield of 75%. Treatment of this salt with dimethyl sulfate an
Enzymes in Organic Synthesis, 15. – Synthesis of Methyl (S)-(−)-2,3-O-Isopropylideneglycerate by Enantioselective Enzyme-catalyzed Hydrolysis of Methyl (±)-2,3-O-Isopropylideneglycerate
✍ Scribed by Schick, Hans ;Schrötter, Eberhard ;Szymanowski, Matthias ;Knoll, Alexander
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 197 KB
- Volume
- 1993
- Category
- Article
- ISSN
- 0947-3440
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✦ Synopsis
Abstract
In contrast to porcine pancreatic lipase (PPL), the serine proteases aP 41 and thermitase are suited as catalysts for the enantioselective ester hydrolysis of methyl (π)‐2,3‐O‐isopropyl‐ideneglycerate (rac‐1). These enzymes allow the preparation of methyl (S)‐(−)‐2,3‐O‐isopropylideneglycerate (1) with an enantiomeric excess of 84–87% in a yield of 19–27% related to the starting racemate.
📜 SIMILAR VOLUMES
Recerved in UK 22 Aprtl 1991
## Abstract By enzyme‐catalyzed intramolecular transesterification methyl (±)‐(3__R__\*,5__S__\*,6__E__)‐3,5‐dihydroxy‐7‐phenyl‐6‐heptenoate (__rac__‐4) can be enantioselectively converted into the δ‐lactone 5. An enantiomeric excess of 80% was obtained by Pancreatin in diethyl ether at ambient tem
## Abstract The enzyme‐catalyzed sequential esterification of (±)‐2‐methylpentanedioic anhydride (__rac__‐1) with 2‐methylpropanol in diethyl ether afforded a 1:1 mixture of 1‐(2‐methylpropyl) 5‐hydrogen (__S__)‐4‐methylpentanedioate (__ent__‐2) with an enantiomeric excess of 88% and 1‐(2‐methylpro
## Abstract The enzyme‐catalyzed regio‐ and enantioselective alcoholysis of racemic __cis__‐ and __trans__‐2,3‐dimethylpentanedioc anhydride in the presence of Novozym 435 from __Candida antarctica__ afforded two of the eight possible monoesters with an enantiomeric excess higher than 90%. Regiosel