The disacchande analogues 19 and 2 of moenomycin A have been synthesized. In contrast to the moenomycin A degradationproduct 1, synthetic conpounds 19 and 2 do not show antibiotic activity.
Routes allowing the synthesis of moenomycinanalogues with one modified sugar component and with new lipid parts were developed (see 10c, 12c, 16b, and 20b in Schemes 2–4). It is anticipated that such analogues will be useful for studying the mode of action of the moenomycin-type transglycosylase inhibitors in detail and for preparing analogues with improved pharmacokinetic properties.
Some developments in the phosphitetriester method for synthesis of oligonucleotides
作者:R.L. Letsinger、E.P. Groody、N. Lander、T. Tanaka
DOI:10.1016/0040-4020(84)85112-1
日期:1984.1
phosphite-triester synthesis of oligonucleotides. Use of this group enables one to simplify procedures for preparing active nucleoside phosphorochloridite reagents, to remove oligonucleotide phosphotriesterintermediates intact from a solid support, and to conduct block syntheses in solution or on a silica support viaphosphite chemistry. Deprotection can be achieved by warming the trihaloethyl phosphotriesters with
A trisaccharide analogue of moenomycin A, 9a, has been synthesized and has found to be antibiotically inactive. This compound differs from an active compound, 9b, solely by the exchange NHAc→OH in unit C. A binding model for moenomycin-type transglycosylase inhibitors at the enzyme penicillin binding protein is proposed.
Moenomycin A - Structure-activity relations synthesis of the D-galacturonamide analogue of the smallest antibiotically active degradation product of moenomycin A
Compound 10c which is the galacturonamide analogue of 2, the smallest degradation product of moenomycin A (1) with full antibiotic activity, has been synthesized. 10c is devoid of antibiotic activity.