Asymmetric amidation of (2S,3S)-pent-4-ene-1,2,3-triol. Total syntheses of (–)-anisomycin and (+)-polyoxamic acid
摘要:
Intramolecular iodoamidation of pentenetriol 2 provides trihydroxy carbamate 8 in 94% de and was elaborated to (-)-anisomycin 15 and (+)-polyoxamic acid 19.
Synthesis of 3,5-Anhydro-2-deoxy-1,4-glyconolactones by Palladium(II)-Catalyzed, Regioselective Oxycarbonylation of C5- and C6-Enitols. ω-Homologation of Aldoses to Produce Intermediates forC-Glycoside/C-Nucleoside Synthesis
The asymmetric Sharpless epoxidation of divinylcarbinol (1), a secondary, achiral allylic alcohol, is described in detail. The epoxidation proceeds with high enantio-control and diastereo-selection. The resulting 1,2-epoxy-4-pentene-3-ols 2 are equilibrated to afford the internal epoxides 5. Hydrolysis of the regioisomers 2 and 5, respectively, furnishes opposite enantiomers of erythro-4-pentenitols