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Concise Chemoenzymatic Three-Step Total Synthesis of Isosolenopsin through Medium Engineering.
- Source :
-
European Journal of Organic Chemistry . Aug2013, Vol. 2013 Issue 16, p3397-3402. 6p. - Publication Year :
- 2013
-
Abstract
- A short and efficient total synthesis of the alkaloid isosolenopsin and its enantiomer has been achieved. The key step was a ω-transaminase-catalysed regioselective monoamination of the diketone pentadecane-2,6-dione, which was obtained in a single step through the application of a Grignard reaction. Initial low conversions in the biotransformation could be overcome by optimisation of the reaction conditions employing suitable cosolvents. In the presence of 20 vol.-% N, N-dimethylformamide (DMF) or n-heptane the best results were obtained by employing two enantiocomplementary ω-transaminases originating from Arthrobacter at 30-40 °C; under these conditions, conversions of more than 99 % and perfect stereocontrol ( ee > 99 %) were achieved. Diastereoselective chemical reduction (H2/Pd/C) of the biocatalytic product gave the target compound. The linear three-step synthesis provided the natural product isosolenopsin in diastereomerically pure form ( ee > 99 %, dr = 99:1) with an overall yield of 64 %. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1434193X
- Volume :
- 2013
- Issue :
- 16
- Database :
- Academic Search Index
- Journal :
- European Journal of Organic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 87708934
- Full Text :
- https://doi.org/10.1002/ejoc.201300157