The first enzymatic degradation products of the antibiotic moenomycin A.
作者:Karl-Heinz Metten、Kurt Hobert、Susanne Marzian、Ulrich E. Hackler、Uwe Heinz、Peter Welzel、Werner Aretz、Dirk Böttger、Udo Hedtmann、Gerhard Seibert、Astrid Markus、Michael Limbert、Yveline Van Heijenoort、Jean Van Heijenoort
DOI:10.1016/s0040-4020(01)86589-3
日期:1992.9
Moenomycin A was degraded by enzymatic cleavage of the bond between the moenuronic acid moiety and the phosphate group. The phosphoric acid monoester 4a could be dephosphorylated further to yield 3a. Compound 3a was used to confirm the previous configurationalassignment at C-2 of the glycerate part of moenomycin A and to prepare ent-4a. 4a and ent-4a are antibiotically inactive.
Employing BINOL-Phosphoroselenoyl Chloride for Selective Inositol Phosphorylation and Synthesis of Glycosyl Inositol Phospholipid from <i>Entamoeba histolytica</i>
chemical synthesis of glycosyl inositol phospholipids from Entamoeba histolytica is reported. The key feature of this synthesis is a regioselective phosphorylation reaction that occurs through desymmetrization of a myo‐inositol derivative with phosphoroselenoyl chloride. A new protecting‐group strategy was developed that utilizes allyl and alloc groups to synthesize complex glycolipids bearing unsaturated