Glycals were synthesized via a simple, mild, convenient and environmentally benign procedure, in which protected glycosyl bromides undergo the reductive elimination in the presence of zinc in PEG-600/H2O at room temperature. The glycals were obtained in 75–92% isolated yields.
Semisynthetic aminoglycoside antibacterials. Part 8. Synthesis of novel pentopyranosyl and pentofuranosyl derivatives of gentamine C1 and C1a
作者:D. Huw Davies、Max Kugelman、Paul Lee、Charles E. Luce、Alan K. Mallams、James B. Morton、Surinderjit S. Saluja、John J. Wright、George Detre、Masato Tanabe、Dennis M. Yasuda
DOI:10.1039/p19810002151
日期:——
of a variety of 6-O- and 5-O-pentopyranosyl and -pentofuranosyl derivatives from 1,3,2′,6′-tetrakis-N-benzyloxycarbonylgentamine C1a and C1 are described. These include neutral glycosides as well as 3-amino-3-deoxy- and 3-deoxy-3-methylamino-glycosides. The solution conformations of these novelsemisynthetic aminoglycoside antibacterials are described.
The totalsynthesis of eucryphin and its five glycosyl-modified derivatives from commercially available phloroglucinol was first developed. The key step for the synthesis of eucryphin relies on selective oxidation to form a hydroxyl group at the C-3 position of chromone by using iodosobenzene diacetate reagent. The methodology may be utilized in the synthesis of functional chromone derivatives.