1. Convergent synthesis of glycoalkaloids solasonine and its saponin derivative.
- Author
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Yang Y, Li T, Hao H, Sheng JZ, Li T, and Peng P
- Subjects
- Stereoisomerism, Solanaceous Alkaloids chemical synthesis, Solanaceous Alkaloids chemistry, Alkaloids chemical synthesis, Alkaloids chemistry, Catalysis, Saponins chemical synthesis, Saponins chemistry
- Abstract
We present a practical and convergent synthesis of glycoalkaloids solasonine 1 and its saponin derivative 2, incorporating a {3- O -α-L-rhamnopyranosyl-(1→2)- O -[β-D-glucopyranosyl-(1→3)]-β-D-galactopyranoside} moiety. The key features of this strategy include the following: (1) AuCl
3 - t BuCN cooperative catalysis enabling 1,2- trans stereoselective glycosidation of 2-branched trisaccharide trichloroacetimidate donors with steroidal aglycons, in the absence of neighboring group participation; (2) "cyanide effect" mediated regioselective benzoylation of the 4- and 6-hydroxyl groups of galactopyranosyl disaccharide; and (3) an effective approach to prevent orthoester byproduct formation.- Published
- 2024
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