Synthesis of mycothiol, 1D-1-O-(2-[N-acetyl-l-cysteinyl]amino-2-deoxy-α-d-glucopyranosyl)-myo-inositol, principal low molecular mass thiol in the actinomycetes
摘要:
Members of the actinomycetes produce 1D-1-O-(2-[N-acetyl-L-cysteinyl]amino-2-deoxy-alpha-D-glucopyranosyl)-myo-inositol or mycothiol 1 as principal low molecular mass thiol, Chemical synthesis of a biosynthetic precursor of mycothiol, the pseudodisaccharide 1D-1-O-(2-amino-2-deoxy-alpha-D-glucopyranosyl)-myo-inositol 13 was achieved by the following steps: (1) Enantioselcctive synthesis gave the glycosyl acceptors (-)-2,3,4,5,6-penta-O-acetyl-D-myo-inositol D-7 and the corresponding L-isomer L-7. (2) Condensation of D-7 and L-7 with the glycosyl donor 3,4,6-tri-O-acetyl-2-deoxy-2-(2,4-dinitrophenylamino)-alpha-D-glucopyranosylbromide afforded the corresponding alpha and beta anomeric products, which could be resolved by silica gel chromatography, (3) Deprotection of these by hydrolysis using an anion exchange resin gave 1D- and 1L-1-O-(2-amino-2-deoxy-alpha-D-glucopyranosyl)-myo-inositol 13 and 15 and the corresponding beta-coupled anomers 14 and 16. Only 13, and to a much lesser extent 15, were used by enzymes present in an ammonium sulphate fraction of a cellfree extract of Mycobacterium smegmatis for the enzymatic synthesis of mycothiol. In the absence of acetyl-SCoA, the immediate biosynthetic precursor of 1, desacetylmycothiol, was the major product. (C) 2002 Elsevier Science Ltd. All rights reserved.
First Total Synthesis of Mycothiol and Mycothiol Disulfide
摘要:
The first total synthesis of mycothiol and mycothiol disulfide was achieved by linking D-2,3,4,5,6-penta-O-acetyl-myo-inositol, O-(3,4,6-tri-O-acetyl)-2-azido-2-deoxy-alpha,beta-D-glucopyranosyl) trichloroacetimidate, and N,S-diacetyl-L-cysteine and deprotecting peracetylated mycothiol. The first full spectral characterization is reported for underivatized mycothiol. The structure of mycothiol was confirmed by spectral analysis of the known bimane derivative.
The total synthesis of myo-inositol polyphosphates
作者:Joseph P. Vacca、S.Jane deSolms、Joel R. Huff、David C. Billington、Raymond Baker、Janusz J. Kulagowski、Ian M. Mawer
DOI:10.1016/s0040-4020(01)89510-7
日期:1989.1
Total synthesis of the individual enantiomers of myo-inositol 4-phosphate (), myo-inositol 1,4-bisphosphate () and myo-inositol 1,4,5-trisphosphate (), together with syntheses of racemic myo-inositol 1,3,4-trisphosphate () and myo-inositol 2,4,5-trisphosphate () are reported. The syntheses feature the use of camphanic acid esters for resolution of protected inositols, and the use of tetrabenzylpyrophosphate
Six bifunctional molecules containing biotin and various inositol phosphates were synthesized. These compounds were designed on the basis of X-ray structures of the complexes of D-myo-inositol 1,4,5-triphosphates (IP3) and phospholipase C δ pleckstrin homology domain (PLCδ PH) considering the application to the biotinâavidin techniques. The building blocks of the inositol moiety were synthesized starting with optically resolved myo-inositol derivatives and assembled to the biotin linker through a phosphate linkage.
Synthesis of phosphatidylinositol mannosides (PIMs)
作者:Andreas Stadelmaier、Richard R Schmidt
DOI:10.1016/j.carres.2003.06.002
日期:2003.11
Two strategies towards the synthesis of phosphatidylinositolmannosides (PIMs) were elaborated which permit selective access to the O-1-, O-2-, and the O-6 position of the myo-inositol residue. Starting materials are 1,2:5,6- and 1,2:4,5-di-O-cyclohexylidene-DL-myo-inositol, respectively. In the latter case, the required assignment to the D- or L-series is based on the transformation of one enantiomer