One-pot enantioselective synthesis of (S)-spirobrassinin and non-natural (S)-methylspirobrassinin from amino acids using a turnip enzyme
- 3 January 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Journal of Natural Medicines
- Vol. 75 (2), 308-318
- https://doi.org/10.1007/s11418-020-01468-9
Abstract
The enantioselective synthesis of (S)-(−)-spirobrassinin, which features a unique sulfur-containing spirooxindole skeleton, was achieved by focusing on the phytoalexin generation in Brassicaceae plants. Specifically, (S)-(−)-spirobrassinin was obtained in a one-pot fashion from l-tryptophan through a reaction involving S-spirocyclization with various turnip enzymes and constituents, i.e., using the turnip as a reaction reagent, catalyst, and reaction vessel. Surprisingly, this strategy also enabled the one-pot enantioselective synthesis of the novel non-natural spirooxindole (S)-(−)-5-methylspirobrassinin from 5-methyl-dl-tryptophan. Graphic abstractKeywords
Funding Information
- JSPS KAKENHI Grant (18J22755, 20K07109, 20H03397)
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