title: Synthesis of the C8'-epimeric thymine pyranosyl amino acid core of amipurimycin.
abstract: The C8'-epimeric pyranosyl amino acid core 2 of amipurimycin was synthesized from D-glucose derived alcohol 3 in 13 steps and 14% overall yield. Thus, the Sharpless asymmetric epoxidation of allyl alcohol 7 followed by trimethyl borate mediated regio-selective oxirane ring opening with azide, afforded azido diol 10. The acid-catalyzed 1,2-acetonide ring opening in 10 concomitantly led to the formation of the pyranose ring skeleton to give 2,7-dioxabicyclo[3.2.1]octane 12. Functional group manipulation in 12 gave 21 that on stereoselective β-glycosylation afforded the pyranosyl thymine nucleoside 2 - a core of amipurimycin.
authors: Garware Research Centre, Department of Chemistry, Savitribai Phule Pune University (Formerly University of Pune), Pune-411007, India.
authors: Pramod R
authors: PR
authors: Markad
authors: Garware Research Centre, Department of Chemistry, Savitribai Phule Pune University (Formerly University of Pune), Pune-411007, India.
authors: Navanath
authors: N
authors: Kumbhar
authors: Garware Research Centre, Department of Chemistry, Savitribai Phule Pune University (Formerly University of Pune), Pune-411007, India.
authors: Dilip D
authors: DD
authors: Dhavale
keywords: 1,3-anhydrosugar; amipurimycin; anti-fungal agent; carbohydrate; peptidyl nucleosides