摘要:
Sialocylglycerolipids represented by the following general formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom or a group CH.sub.3 CO--; R.sup.2 represents an alkali metal, a hydrogen atom or a lower alkyl group; R.sup.3 represents a hydrogen atom or a group C.sub.n H.sub.2n+1 -- (n is an integer ranging from 1 to 30); and R.sup.4 represents a group C.sub.m H.sub.2n+1 -- (m is an integer ranging from 1 to 30) are herein disclosed. They are prepared by treating a corresponding compound in an alkaline aqueous solvent. The method makes it possible to provide these compounds in a high yield by a simple processes.
摘要:
The present application discloses a new sialosyl glyceride having the following formula, which compound is useful as a remedy for nervous diseases, has an excellent compatability with the living bodies, and is easily producible. ##STR1## wherein R.sup.1 represents a hydrogen atom or XCH.sub.2 CO-- (X being a halogen atom), R.sup.2 represents an alkali metal, a hydrogen atom or a lower alkyl group, R.sup.3 represents a hydrogen atom or --CO(CH.sub.2)mCH.sub.3, R.sup.4 represents --CO(CH.sub.2)mCH.sub.3 amd m and n each represents a number of 0 to 30.
摘要:
This invention provides a novel compound having a formula such as ##STR1## This invention also provides a process for preparing such a compound. The novel compound has excellent immunological activity.
摘要:
The present invention provides ganglioside-related compounds expressed by the following formula: ##STR1## (wherein R.sub.1 denotes a hydrogen atom or SiR.sub.3 R.sub.4 R.sub.5 (wherein R.sub.3 and R.sub.4 each denotes a methyl or phenyl group, and R.sub.5 denotes a tertiary butyl or dimethylphenylmethyl group), and R.sub.2 denotes a hydrogen atom, a trityl group, or ##STR2## (wherein M denotes an alkali metal atom)) and methods of producing the same. These ganglioside-related compounds are useful as markers for the early detection of cancer and in the immunotherapy for cancer.
摘要:
The present invention relates to sialic acid derivatives. According to the present invention, there is provided sialic acid derivatives having the general formula (I): ##STR1## wherein, R.sup.1 represents hydrogen, an acetyl group, a trityl group, ##STR2## (R.sup.5 represents hydrogen or an acetyl group and R.sup.6 represents hydrogen, sodium or a methyl group).R.sup.2 represents hydrogen or an acetyl group,one of R.sup.3 and R.sup.4 represents ##STR3## (R.sup.7 represents a hydrogen atom or an acetyl group, R.sup.8 represents a hydrogen atom, an acetyl group or a benzyl group, R.sup.9 represents a hydrogen atom, an acetyl group, a benzyl group or ##STR4## wherein R.sup.10 represents a hydrogen atom or a benzoyl group), while the other represents --COOR.sup.11 wherein R.sup.11 represents hydrogen, sodium, or a methyl group.
摘要:
A sialic acid-bonded octapeptide represented by the following general formula (I): ##STR1## wherein R represents a hydrogen atom or an acetyl group; and R' represents a lower alkyl group, an aralkyl group, a hydrogen atom or an alkali metal atom, is herein disclosed. The peptide chain of the sialic acid-bonded octapeptide is constituted by 8 amino acid molecules on the C-terminus side of FTS and the compounds represented by formula (I) can be obtained by bonding sialic acid to the amino terminus of the peptide chain according to condensation. These octapeptides show excellent physiological activity comparable to FTS and a half life in blood longer than that of FTS and it is expected that the affinity of the peptide to lymphocytes is also enhanced. Thus they can effectively be used as medicines for treating the lowering and abnormality of functions of the thymus.
摘要:
Novel unnatural ceramide related compounds, for instance, (2S, 3S)-2-tetracosanamido-octadecane-1,3-diol are herein provided, which are useful as intermediates in preparing ceramide moieties employed in the preparation of glycolipids and gangliosides known as tumor markers or molecular markers and which are prepared by, for instance, subjecting a chiral compound represented by the following formula: ##STR1## to deacetal treatment.
摘要:
This invention provides a novel process for preparing a compound represented by the formula ##STR1## In accordance with this invention, the compound is prepared by reacting a compound represented by the formula ##STR2## with glycolic acid in the presence of dicyclohexylcarbodiimide. The compound (2) is a useful precursor for the preparation of N-glycolylneuraminic acid: ##STR3##
摘要:
A sialic acid derivative having an active carbonyl group represented by the formula [I]: ##STR1## wherein R.sup.1 represents hydrogen or acetyl group; R.sup.2 represents hydrogen, a metal or a lower alkyl group; R.sup.3 represents hydrogen, hydroxyl gorup, or a residue removed hydrogen from an alcohol portion of an active ester; Ac represents acetyl group; and n is 1 to 20, respectively. This sialic acid derivative [I] can be utilized as a starting material for various complex having a sialic acid in the molecule since it has an active carbonyl group in the molecules so that it shows high reactivity.
摘要:
The present invention relates to a new process for preparing 3-O-(sodium(5-acetamide-3,5-dideoxy-alpha-D-glycero-D-galacto-2-noneuro pyranosyl)onate-1,2-di-O-tetradecyl-Sn-glycerol (3) consisting essentially of hydrolyzing a 3-O-(C.sub.1-5 alkyl(5-acetamide-4,7,8,9-tetra-O-acetyl-3,5-di-deoxy-alpha-D-glycero-D-galacto-2-noneuropyranosyl)onate)-1,2-di-O-tetradecyl-Sn-glycerol (1) in a single step, in an aqueous lower aliphatic alcohol solution of an alkali metal hydroxide.