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Kentaro Hirai

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Featured researches published by Kentaro Hirai.

Chemical & Pharmaceutical Bulletin | 1964

Studies on the Pyrimidine Derivatives. XXXII. Syntheses of N-Substituted Pyrimidine and Related Compounds. (1)

Akira Takamizawa; Kentaro Hirai

The acid catalyzed condensation reactions of N-substituted ureas with enolether ester (I) or nitrile (II) were carried out, and the condensation products were isolated and those structures were confirmed. Alkylation of ethyl 2-oxo-1, 2, 3, 4-tetrahydro-5-pyrimidinecarboxylate (XXI) afforded N-substituted tetrahydropyrimidines. Dehydrogenation of these N-substituted tetrahydropyrimidines gave N-substituted dihydropyrimidines readily.

Journal of Organic Chemistry | 1965

Studies on the Pyrimidine Derivatives and the Related Compounds. XXXVII.1 Reactions of Ethyl 3-Ethoxy-2-methoxymethylenepropionate with Thiourea Derivatives

Akira Takamizawa; Kentaro Hirai

Journal of Organic Chemistry | 1964

Studies on the Pyrimidine Derivatives. XXIX.1,2 Reactions of 3-Ethoxy-2-methoxymethylenepropionitrile and 3-Ethoxy-2-ethoxymethoxymethylpropionitrile with Urea and Thiourea Derivatives

Akira Takamizawa; Kentaro Hirai; Yoshiro Sato; Kazuo Tori

Chemical & Pharmaceutical Bulletin | 1967

Studies on Pyrimidine Derivatives and Related Compounds. XLIV. Syntheses of Thiazolo [3, 2-a] pyrimidine Derivatives

Akira Takamizawa; Kentaro Hirai; Teruyuki Ishiba; Yoshihiro Matsumoto

Chemical & Pharmaceutical Bulletin | 1964

Studies on the Pyrimidine Derivatives. XXXI. Reactions of Ethyl 2-Methoxymethylene-3-ethoxypropionate with Ureas

Akira Takamizawa; Kentaro Hirai

Chemical & Pharmaceutical Bulletin | 1964

STUDIES ON THE PYRIMIDINE DERIVATIVES. XXX. SYNTHESES AND REACTIONS OF O-(2-TETRAHYDROPYRANYL)-THIAMINE, O-TRITYLTHIAMINE, S-ACYLTHIAMINE, AND S-ALKOXYCARBONYLTHIAMINE.

Akira Takamizawa; Kentaro Hirai; Yoshio Hamashima; Machiko Hata

Chemical & Pharmaceutical Bulletin | 1962

Studies on the pyrimidine derivatives. XX. On the studies of S-alkoxycarbonylthiamine. (1).

Akira Takamizawa; Kentaro Hirai; Yoshio Hamashima

Tetrahedron Letters | 1967

Studies on pyrimidine derivatives and related compounds. LI. Reaction of thiamine with amines

Akira Takamizawa; Kentaro Hirai; Yoshio Hamashima

Chemical & Pharmaceutical Bulletin | 1966

Studies on the Pyrimidine Derivatives and the Related Compounds. XXXVIII. Investigation on 2-Alkoxy-methylene-3-ethoxypropionitrile and Ethyl 2-Alkoxymethylene-3-ethoxypropionate

Akira Takamizawa; Kentaro Hirai; Shinzaburo Sumimoto

The Journal of vitaminology | 1965

Syntheses of O,S-dicholanoyl-thiamine derivatives.

Akira Takamizawa; Kentaro Hirai; Teruyuki Ishiba; Shohei Hayakawa

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Yoshio Hamashima

Kyoto Pharmaceutical University

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Yoshiro Sato

Nagoya City University

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