Ajinomoto Co., Ltd.

Hisao Iwagami

Naohiko Yasuda

Hiroshi Shiragami

Eiji Nakanishi

Yutaka Honda

Masayuki Arai

Kenzo Yokozeki

Yusuke Amino

Shigeru Nakamori

Yasuhiro Tanaka

Shigeru Yamanaka

Chikahiko Eguchi

Koji Mitsugi

Toshihisa Kato

Yasuo Irie

Masaru Okutsu

Hideomi Saito

Yukio Sasaki

Ichiro Takase

Teruaki Nakamiya

A process for preparing 2',3'-dideoxyinosine comprising reducing a nucleoside of the formula IIIa or IIIb ##STR1## wherein R.sup.2 is hydrogen, C.sub.1-12 acyl, C.sub.1-12 alkyl, C.sub.7-8 aralkyl or a silyl protecting group; X is Cl, Br, or I; R.sub.5 is C.sub.1-12 acyl; H.sub.x is hypoxanthine; with hydrogen in the presence of a palladium catalyst; wherein said reduction is conducted in a solvent containing a base of pH 9-11 and wherein the solvent is acetonitrile, aqueous acetonitrile, aqueous ethyl acetate, or aqueous methanol.

Process for preparing 2', 3'- dideoxyinosine

A method for selective hydrolysis of nucleoside derivatives using cyclodextrin in basic solution is disclosed.

Method for production of nucleoside derivatives by selective hydrolysis

A process for preparing 2',3'-dideoxyadenosine of the formula ##STR1## wherein B is adenine, wherein R.sup.1 is hydrogen, C.sub.1-12 acyl, C.sub.1-12 alkyl, C.sub.7-8 aralkyl, or silyl, said process comprising:

Process for preparing 2',3'-dideoxyadenosine

A process for preparing 2',3'-didehydro-2',3'-dideoxynucleoside derivatives (III) ##STR1## by reacting a compound (I) ##STR2## with a viologen (N,N'-dialkyl-4,4'-bipyridinium salt) is disclosed. In the formulae R.sup.1 is C.sub.1-12 acyl or sulfonyl, R.sup.2 is hydrogen, C.sub.1-12 acyl, C.sub.1-12 alkyl, C.sub.6-18 aralkyl, or silyl, X is a halogen atom, and B is a purine, pyrimidine, imidazole, or triazole base residue.

Process for preparing 2',3'-dideoxy nucleoside derivatives

The present invention relates to novel azetidinone derivatives of the general formula: ##STR1## where n is 0 or 2,

4-Methylsulfonyl-azetidinone derivatives

A 5-substituted-3-isoxazolecarboxylic acid derivative of the general formula: ##STR1## wherein X stands for a phenyl group, thienyl group, furyl group or pyridyl group, each of which optionally may carry at least one substituent group; R stands for a phenyl group or hydroxyphenyl group; and A stands for a group of the formula: ##STR2## wherein Y stands for ##STR3## in which the carbon atom with which the carboxyl group combines with the nitrogen atom in A, M stands for a hydrogen atom or a substituent group, and Z stands for a hydrogen atom, hydroxy group, acyloxy group, carbamoyloxy group, aromatic heterocycle thio group or aromatic nitrogen-containing heterocycle quaternary ammonium group, is disclosed along with methods for producing these compounds.

5-Substituted-3-isoxazolecarboxylic acid derivatives

The invention relates to imidazolecarboxylic acid derivatives of penicillins and cephalosporins, which are especially useful for the treatment of Pseudomonas aeruginosa-derived infections in humans and other animals.

Imidazolecarboxylic acid derivatives

A method of preparing sodium salts of an imidazoledicarboxylic acid derivative of a substituted cephalosporin represented by the general formula of ##STR1## where X is a radical selected from the group consisting of hydrogen, halogen, hydroxyl, alkyl, aryl, aralkyl, alkoxy, aryloxy, aralkyloxy, mercapto, alkylthio, arylthio, aralkylthio, alkylsulfonyl, arylsulfonyl, aralkylsulfonyl, alkylsulfinyl, arylsulfinyl, aralkylsulfinyl, amino, mono- or dialkylamino, mono- or diarylamino, mono- or diaralkylamino, acylamino, sulfonic acid, nitro or heterocyclic group;

Method of preparing sodium salts of imidazoledicarboxylic acid

D-.alpha.-amino acids are produced by contacting a 5-substituted hydantoin with an effective amount of an enzyme capable of converting the 5-substituted hydantoin to the D-.alpha.-amino acid produced by a microorganism in an aqueous medium at a pH in the range of 4 to 9, the microorganism being capable of utilizing the D-isomer of the 5-substituted hydantoin as the sole nitrogen source, but substantially incapable of utilizing the L-isomer of the 5-substituted hydantoin as the nitrogen source and the substituent of the 5-position being such that upon reaction with the enzyme, an optically active D-.alpha.-amino acid isomer is produced; and recovering the D-.alpha.-amino acid which accumulates in the aqueous medium.

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Kawasaki, Japan

Hisao Iwagami