Novel aminoglycoside derivatives and their salts containing 2-deoxystreptamine moiety, of which the 1-amino group is acylated by a group represented by the formula: ##STR1## (wherein R is 4 to 6 membered heterocyclic group containing 1 to 2 nitrogen atoms which may optionally be substituted.) effective in treatment of infectious diseases caused by gram positive and gram negative bacteria.
There is disclosed are an enzyme preparation characterized by a polymer carrier having fine pores with average radius of 200-500 Å and the enzyme is capable of converting an N-substituted cyclic imino ester into an (S)—N-substituted cyclic imino acid, thereby an (S)—N-substituted cyclic imino acid is preferentially produced, and has an amino acid sequence as set forth in SEQ ID NO: 1 or the like.
本发明公开了一种酶制剂,其特征在于具有平均半径为200-500Å的细孔的聚合物载体,并且该酶能够将N-取代的环状亚氨酸酯转化为(S)-N-取代的环状亚氨酸,从而优先产生(S)-N-取代的环状亚氨酸,并具有SEQ ID NO:1或类似的氨基酸序列。
Aminoglycoside derivatives, process for their manufacture, pharmaceutical compositions and carboxylic acids
申请人:SHIONOGI & CO., LTD.
公开号:EP0001643A2
公开(公告)日:1979-05-02
Aminoglycoside derivatives of the general formula (I)
wherein R is an optionally substituted 4- to 6-membered heterocyclic group containing 1 or 2 nitrogen atoms;
R is aminomethyl, hydroxymethyl, 1-aminoethyl, or 1-methylaminoethyl;
R', R and R" are each hydrogen or hydroxy; π2 R3 and R° are each hydrogen or hydroxy;
R4 is hydroxy or amino;
R5 is amino or methylamino;
R' is hydroxy or methyl;
R" is hydrogen, hydroxymethyl, or carbamoyloxymetnyl; and
the dotted line represents the optional presence of a double bond
and their salts with acids, a process for their manufacture, pharmaceutical compositions having antibiotic activity and containing compounds of the general formula (I); furthermore carboxylic acids of the general formula (III)
wherein R has the above meaning, useful as intermediates for preparing the compounds of the general formula (I).
Method for racemization of optically active azetidine-2-carboxylate
申请人:Sumitomo Chemical Company, Limited
公开号:EP0957089A1
公开(公告)日:1999-11-17
A method for racemization of an optically active N-substituted azetidine-2-carboxylic acid ester of the formula (1):
wherein * represents an asymmetric carbon atom,
R1 represents an optionally substituted aryl group, a saturated hydrocarbon group which may be substituted with an optionally substituted aryl group, or an unsaturated hydrocarbon group,
R2 represents a saturated hydrocarbon group which may be substituted, an optionally substituted unsaturated hydrocarbon group, an alkyloxycarbonyl group which may be substituted, an alkenyloxycarbonyl group, or an optionally substituted sulfonyl group,
which comprises heating the ester of the formula (1) at 100°C or higher or subjecting the ester to contact with a basic compound selected from an alkali metal hydride, an alkali metal alkoxide of a tertiary alcohol and an organic amine.
The present invention provides a novel gene encoding a protein having an excellent catalyst ability for producing (S)-N-substituted cyclic imino acid represented by the general formula (2) (= the (S)-cyclic imino acid (2)):
and to provide a novel method for producing the (S)-cyclic imino acid (2) by an asymmetric hydrolization of the N-substituted cyclic imino acid ester represented by the general formula (1):
in a manner of gene engineering technology utilizing the novel gene provided.