Synthesis of 2, 5-Anhydro-3, 4, 6-tri-O-benzyl-L-talose Dimethylacetal via 2, 5-Anhydro-3, 6-di-O-tosyl-L-idose Dimethylacetal
نویسندگان
چکیده
منابع مشابه
1-O-Benzyl-2,3-O-isopropylidene-6-O-tosyl-α-l-sorbofuranose
IN THE TITLE COMPOUND (SYSTEMATIC NAME {(3aS,5S,6R,6aS)-3a-[(benz-yloxy)meth-yl]-6-hy-droxy-2,2-di-methyl-tetra-hydro-furo[2,3-d][1,3]dioxol-5-yl}methyl 4-methyl-benzene-sulfonate), C23H28O8S, the absolute structure and relative stereochemistry of the four chiral centres have been established by X-ray crystallography, with the absolute configuration inferred from the use of l-sorbose as the sta...
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In the title compound, C(20)H(24)O(5), the six-membered pyran-ose ring adopts a chair conformation. The dihedral angle between the planes of the phenyl groups of the benzyl substituents is 63.1°. Two types of inter-molecular O-H⋯O hydrogen bonds lead to the formation of infinite chains along the b axis. Only weak C-H⋯O contacts exist between neighboring chains.
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In the title compound, C(21)H(22)Cl(2)O(4), the pyranosyl ring adopts a twist-boat conformation with the O-benzyl groups in equatorial positions. In the crystal, O-H⋯O hydrogen bonding results in infinite chains of mol-ecules along [100]. The structure is further consolidated by weak C-H⋯O, C-H⋯Cl and C-H⋯π inter-actions. The absolute structure was determined.
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Some mysterious features of the strong interactions become easily understood if our usual QCD with is ‘close to’ SU( ) and if the latter theory is confining. theories are theoretically simpler; in particular there has been much progress in constructing weak-coupling duals in string theory. In this poster I will describe some of the things that recent lattice calculations tell us about the large...
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The title compound, C(24)H(27)NO(9), is one of the epimers of the Henry reaction of 3-O-benzyl-6-O-benzoyl-2-O-isopropyl-idene-a-d-glucofuran-5-one with nitro-methane. The conformation of the five membered rings is as expected from the precursor compound and the mol-ecule is folded with a dihedral angle of 51.4 (2)° between the aromatic rings. One O-H⋯O hydrogen bond and some intra-molecular an...
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ژورنال
عنوان ژورنال: Agricultural and Biological Chemistry
سال: 1972
ISSN: 0002-1369,1881-1280
DOI: 10.1271/bbb1961.36.1655