- 著者
- 田中 博道 内田 祐子 篠崎 操 早川 弘之 松田 彰 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.31, no.2, pp.787-790, 1983-02-25 (Released:2008-03-31)
- 参考文献数
- 17
- 被引用文献数
- 21 32
6-Chloro-9-(2, 3-O-isopropylidene-β-D-ribofuranosyl) purine (1) was found to be a suitable substrate for the preparation of C-8 substituted purine nucleosides. Thus, upon lithiation of 1 with LDA and successive reaction with various types of electrophiles, the C-8 substituted products were obtained. The C-6 chlorine atoms in these products were readily replaced by an amino group, a mercapto group, or hydrogen, providing a facile preparation of 8-substituted adenosines, 6-thioinosines, or nebularines.
- 著者
- 鈴木 雅博 田中 博道 宮坂 貞
- 出版者
- 公益社団法人日本薬学会
- 雑誌
- Chemical & pharmaceutical bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.35, no.10, pp.4056-4063, 1987-10-25
Several 5-carbon-substituted 1-β-D-ribofuranosylimidazole-4-carboxamides were synthesized via the direct C-5 lithiation of a protected 4-carboxamide derivative as the key reaction step. Wittig reaction of a 5-formyl derivative was also examined.
- 著者
- 早川 弘之 高井 富美 田中 博道 宮坂 貞 山口 健太郎
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.38, no.5, pp.1136-1139, 1990-05-25 (Released:2008-03-31)
- 参考文献数
- 18
- 被引用文献数
- 18 23
Displacement of a hydroxyl group in pyrimidine nucleosides having a vicinal diol system by a fluorine atom was investigated by using diethylaminosulfur trifluoride (DAST). Though participation of the base moiety often thwarts the desired introduction of a fluorine atom, it was found that appropriate modification of the base and/or sugar moieties allowed the desired fluorodehydroxylation to occur, giving 5'-, 3'-β-, and 2'-α-fluorinated uracilnucleosides in good yields.
- 著者
- 田中 博道 松田 彰 飯島 秀治 早川 弘之 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.31, no.6, pp.2164-2167, 1983-06-25 (Released:2008-03-31)
- 参考文献数
- 9
- 被引用文献数
- 25 40
A new class of 5, 6-disubstituted uridines, in which the C-6 position was occupied by phenylthio group or iodine, were synthesized via lithiation of the corresponding 5-substituted 2', 3'-O-isopropylidene-5'-O-methoxymethyluridines and subsequent electrophilic reactions. These newly-synthesized uridine derivatives exhibited antileukemic activities against mouse leukemia L5178Y cells in culture.
- 著者
- 沢田 誠吾 宮坂 貞 荒川 基一
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.26, no.1, pp.275-287, 1978-01-25 (Released:2008-03-31)
- 被引用文献数
- 2 2
1-(Substituted-phenyl)-2, 3-tetramethylenepyrrolo [2, 1-b] benzothiazoles (IV-2-IV-17) were synthesized from the correspoding 3-(substituted-phenyl) thiazolo [2, 3-b] benzothiazolium perchlorates (III) by the reaction of 1-morpholino-1-cyclohexene, an enamine. On reaction with cuprous cyanide p-substituted bromobenzene (IV-2) furnished benzonitrile (IV-23), which was converted into the corresponding 1-phenyl derivatives (IV) with various aliphatic functional groups at the para position of the phenyl moiety. On reaction with methylmagnesium iodide and subsequent acid hydrolysis IV-23 was converted into acetophenone (IV-24), which reacted with methyltriphenylphosphylene to give 2-phenylpropylene (IV-38). Hydroboration of IV-38 afforded 2-phenylpropanol (IV-39), which was oxidized into the corresponding propionic acid (IV-43), the sulfur atom being oxidized at the same time into sulfoxide. Deoxygenation of the ester (IV-44) was successfully carried out with PBr3 to obtain the desired α-phenyl substituted propionic acid ester (IV-45).
- 著者
- 沢田 誠吾 宮坂 貞 荒川 基一
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.25, no.12, pp.3370-3375, 1977-12-25 (Released:2008-03-31)
- 被引用文献数
- 5 5
Seventeen 3-(substituted-phenyl) thiazolo [2, 3-b] benzothiazolium perchlorates (3) were synthesized by acid-cyclization of the ketosulfides (2), which were prepared by alkylation of 2-mercaptobenzothiazole sodium salt with substituted phenacyl halides (1). Some of the phenacyl halides were prepared by chloroacetylation of substituted benzenes, and the others by bromination of the corresponding substituted acetophenones.
- 著者
- 沢田 誠吾 八重樫 隆 古田 富雄 横倉 輝男 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.41, no.2, pp.310-313, 1993-02-15 (Released:2008-03-31)
- 参考文献数
- 22
- 被引用文献数
- 13 20
7-Ethylcamptothecin (1d), a model which does not have any site on the A-ring for further modification was converted into water-soluble derivatives by opening the E-ring lactone. 1d was heated in N, N-dimethylenediamine to yield amide 2a, and this was then acylated to furnish 3a-q, which were soluble in water as their HCl salts. The propionyl (3b), butyryl (3c) and methylthiopropionyl (3h) derivatives showed higher activity than the sodium salt of 1d. The acyl group makes the derivatives more lipophilic, and ease of hydrolysis of amide 2a to 1d is thought to be necessary for significant activity.
- 著者
- 八重樫 隆 沢田 誠吾 古田 富雄 横倉 輝男 山口 健太郎 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.41, no.5, pp.971-974, 1993-05-15 (Released:2008-03-31)
- 参考文献数
- 10
- 被引用文献数
- 6 10
The structure of the N-amino pyridone (4a) obtained by the reaction of camptothecin (1a) with hydrazine was determined by X-ray crystallography. A mixture of 7-etylcamptothecin (1b) and hydrazine hydrate was stirred at room temperature, and the hydrazide (2b) was isolated as its diacetate 2c. Treatment of the 17-O-acetyl amide (5a) with hydrazine gave 1b (74% yield) and the N-amino lactam 6 (11% yield). Compounds with bulky acyl groups, 5c-e, gave 6 in modest yields. The N-amino lactam 6 was smoothly dehydrated into the pyridone 4d by refluxing in hydrazine hydrate.
- 著者
- 八重樫 隆 野方 健一郎 沢田 誠吾 古田 富雄 横倉 輝男 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.40, no.1, pp.131-135, 1992-01-25 (Released:2008-03-31)
- 参考文献数
- 19
- 被引用文献数
- 9 10
Water-soluble derivatives having the lactone ring intact were synthesized starting from 7-ethyl-10-hydroxycamptothecin (1). Glycosides (2) of the phenolic hydroxyl group of 1 were obtained by reaction with acetylated α-bromosugars in acetone or aqueous acetone in the presence of potassium carbonate, followed by deprotection.Phosphates (3) were prepared by reaction of 1 with phosphoryl chloride in pyridine or with dibenzylchlorophosphoridate.Sulfates (4) were obtained by reaction of 1 with sulfur trioxide-pyridine complex in the presence of a tertiary amine.The organic ammonium salts of monophosphate (3p) and sulfates (4a and 4b) showed significant activity against L1210 in vivo.
- 著者
- 沢田 誠吾 松岡 俊一 野方 健一郎 永田 洋 古田 富雄 横倉 輝男 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.39, no.12, pp.3183-3188, 1991-12-25 (Released:2008-03-31)
- 参考文献数
- 28
- 被引用文献数
- 39 57
20(S)-Camptothecin derivatives having nitro, amino, chloro, bromo, hydroxyl and methoxyl groups in the A-ring were synthesized. B-Ring hydrogenated camptothecin (2a) was converted into 10-hydroxycamptothecin (6e) by treatment with lead tetraacetate in trifluoroacetic acid. 10-Substituted derivatives (6) were obtained by a photoreaction of N-oxides (9). The cytotoxicity o the A-ring modified camptothecins was evaluated against KB cells in vitro and leukemia L1210 in mice. 7-Ethyl-10-hydroxycamptothecin (6i) was identified as a potential derivative for further modification.
- 著者
- 沢田 誠吾 岡島 悟 相山 律男 野方 健一郎 古田 富雄 横倉 輝雄 杉野 栄一 山口 健太郎 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.39, no.6, pp.1446-1454, 1991-06-25 (Released:2008-03-31)
- 参考文献数
- 18
- 被引用文献数
- 144 197
Nevel 36 derivatives (6), bonding the phenolic hydroxyl group of 7-ethyl-10-hydroxycamptothecin (4) with diamines through a monocarbamate linkage, were synthesized and their antitumor activity was evaluated in vivo. The derivatives were soluble in water as their HC1 salts wiht the E lactone ring intact and exhibited significant antitumor activity. One of the derivatives, 6-27 showed excellent activity against L1210 leukemia and other murine tumors.The structure of its hydrochloride trihydrate (CPT-11) was determined by spectroscopic and crystallographic methods.
- 著者
- 沢田 誠吾 野方 健一郎 古田 富雄 横倉 輝男 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.39, no.10, pp.2574-2580, 1991-10-25 (Released:2008-03-31)
- 参考文献数
- 14
- 被引用文献数
- 44 56
A radical substitution reaction of 20(S)-camptothecin (1) with methanol furnished 7-hydroxymethylcamptothecin (2). Reaction of 1 with primary alcohols higher than methanol gave 7-alkylcamptothecins (4), of which alkyl groups were one carbon less than the alcohols used and also 7-hydroxyalkylcamptothecins (5). For the preparation of 7-alkylcamptothecin (4), aldehydes were used as a radical source and several alkylated derivatives were synthesized. 7-Acyloxymethyl derivatives (6), 7-carbaldehyde (7), iminomethyl derivatives (10), acid (11), esters (12) and amides (13) were synthesized starting from 2. 7-Ethyl-(4b) and 7-propylcamptothecin (4c), acyloxymethyl compounds 6a, 6c and ethyl ester (12b) exhibited higher antitumor activity than 1 against L1210 in mice.
1 0 0 0 機能の創生を目指すヌクレオシドの化学合成
本研究班では、従来の医薬品開発を目標に直結したランダムスクリ-ニング的発想に基づく研究ではなく、核酸の構造や代謝の分子論的な解析を基に新しい機能性ヌクレオシドの創出を図ることを目的にしている。松田は、ヌクレオシドレベルでは化学的に安定であるがDNAに組み込まれると鎖切断などの反応性を示すヌクレオシドの設計を行っており、今年度は、2'ーdeoxycytidineの2'ーβ位にシアノ基、イリシアノ基、エチニル基を含む誘導体の合成を行った。この中で、シアノ基を含むCNDACは強い細胞毒性を示し、その5'ートリリン酸体は牛由来のDNAポリメラ-ゼαの強力な阻害剤となった。この時の阻害様式は、chainーterminator型であったが鎖切断の結果そうなったのかどうかについて更に検討を行っている。牧は、アデノシン誘導体が電子移動により酸化される新しい反応を見い出し、その反応を利用し、DNAやRNAの鎖切断へ応用しようと試みている。宮坂は、AIDSの原因ウイルスであるHIVーIを新しい様式で阻害するアシクロウリジン誘導体を合成した。その中でこれらの化合物は、従来のAZTやddIが感染細胞中の酵素によりトリリン酸体に変換されて、逆転写酵素を阻害するのとは異なり、リン酸化を受けずに阻害すること、また天然の基質であるTTPと非競合型の阻害を示すことから、逆転写酵素のTTP結合部位でアロステリックな阻害を示すことを明らかにした。綿矢は、ヌクレオシドやヌクレオチドの生物種間での差異を明らかにするために、寄生原虫をヒト由来細胞を用いて、糖部や塩基部が天然型とは異なる誘導体を用いて代謝系を調べた。リュ-シュマニアが特にプリン生合成がヒトとは異なることを利用して強い抗原虫作用を示すヌクレオシドを数種見い出した。
1 0 0 0 機能の創生を目指すヌクレオシドの化学合成
本研究班では、核酸の構造や代謝の分子論的な解析を基にした機能性ヌクレオシド誘導体の創生を計ることを目指している.松田は、新しいアミノリンカーを持つDNAオリゴマーの設計と合成を行なった.これらは標的とするRNAと安定な二本鎖を形成し,さらに、リンカーにインターカレーターなどの機能性分子を導入することが可能である.これらのオリゴマーは天然型のリン酸ジエステル結合を持つにもかかわらずヌクレアーゼに抵抗性を示すこと,および,RNase Hの基質になることを明らかにした.DNA鎖切断型の自殺基質として分子設計したCNDACがモデルテンプレート・プライマー系でDNApolymeraseを作用させたとき予想通りの鎖切断を引き起こすことを確認した.牧は、光励起下で活性酸素の模倣物として機能する特異な複素環N-オキシド(POP)を用いてヌクレオシド類の光酸化反応を詳細に検討した.さらに、POPが水中で水酸ラジカルを発生しDNA鎖を効率的に切断することを明かにした.宮坂は、HIV-1の逆転写酵素(RT)に特異的に結合する化合物(BEMI)を用いてこの化合物に対する耐性株の遺伝子分析を行なった.本化合物によるRT耐性は103番目のリシンがグルタミン酸に,181番目のチロシンがシステインに変化していることによることを明らかにした.綿矢は、ヒトに感染しマラリアを引き起こす4種類のマラリア原虫を識別できるDNA診断法を開発した.さらに,5-fluoroorotateとスルファモノメトキシンを併用することによりクロロキン耐性マラリア(ネズミマラリア感染マウス)を治癒出きることを明らかにした.
- 著者
- 松田 彰 篠崎 操 宮坂 貞 町田 治彦 畔蒜 藤一
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.33, no.4, pp.1766-1769, 1985-04-25 (Released:2008-03-31)
- 参考文献数
- 24
- 被引用文献数
- 19 30
Reaction of 2-iodoadenosine (2) with terminal alkynes in the presence of bis (triphenylphosphine) palladium dichloride and cuprous iodide in triethylamine and N, N, -dimethylformamide gave 2-alkynyl-adenosines (3a-h) in excellent yields. Several compounds showed high activity as inhibitors in rat passive cutaneous anaphylaxis (PCA) reaction. Among them, 2-(3-hydroxypropynyl)- and 2-(3-hydroxybutynyl)-adenosines (3d, f) are much more potent than disodium cromoglycate (DSCG).
- 著者
- 松田 彰 佐藤 和恵 宮坂 貞 上田 亨
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.32, no.5, pp.2048-2051, 1984-05-25 (Released:2008-03-31)
- 参考文献数
- 8
- 被引用文献数
- 4 4
2-Aminomethylinosine (1), a one-carbon extended homolog of an exocyclic amino group of guanosine, was synthesized from guanosine by the use of a newly developed protection and deprotection method. Introduction of a methoxy group into the 6-position of 2-benzenesulfonyl-purine riboside facilitated a nucleophilic substitution with cyanide to afford 2-cyano-6-methoxypurine riboside (11) which was subsequently hydrogenated and demethylated with trimethylsilyl iodide to afford 1.
- 著者
- 松田 彰 渡辺 一之 宮坂 貞 上田 亨
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.37, no.2, pp.298-303, 1989-02-25 (Released:2008-03-31)
- 参考文献数
- 16
- 被引用文献数
- 3 5
The synthesis of a new carbon-bridged cyclopurine nucleoside, 2'-deoxy-8, 2'-methanoguanosine (25), which is fixed in a high-anti torsional angle region, was accomplished. 2-Acetamido-6-ethoxy-8-methanesulfonyl-9-(3, 5-di-O-acetyl-2-O-tosyl-1-β-D-ribofuranosyl)purine (18) was cyclized with carbanions of malonic esters, followed by sequential deblocking and decarboxylation to afford 25. The ultraviolet spectra of 25 in neutral solution revealed two separated bands corresponding to their B1u and B2u transitions, which was rather similar to the case of its O6-ethyl derivative (22), but quite different from the previously reported 8, 2'-methanoguanosine (26), a ribosyl counterpart of 25. The circular dichroism spectra of these cyclonucleosides are also discussed.
- 著者
- 浜道 則光 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.38, no.12, pp.3253-3256, 1990-12-25 (Released:2008-03-31)
- 参考文献数
- 21
- 被引用文献数
- 1 3
Substituent and solvent effects on the tautomeric equilibration (E/Z) of α-(N-alkyl and -arylaminomethylene)-9-(methoxymethyl)-9H-purine-6-acetonitriles (3a-q) have been studied by means of proton nuclear magnetic resonance spectroscopy in protic and aprotic solvents at 25°C. In chloroform-d these compounda (3a-q) exist mainly as the E-form. On the other hand, in methanol-d4 or dimethylsulfoxide-d6 the alkylamines (3a-c), phenylamine (3e), meta- or para-substituted phenylamines (3f-j) and 2, 6-disubstituted phenylamines (3p and q) exist mainly as the Z-form, while the trityl compound (3d), and ortho-substituted compounds (3k-o) showed a predominance of the E-form.
- 著者
- 浜道 則光 宮坂 貞
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.38, no.7, pp.2018-2019, 1990-07-25 (Released:2008-03-31)
- 参考文献数
- 7
- 被引用文献数
- 1 1
6-Dicyanomethylene-9-tetrahydrofuranylpurine (4), which was obtained by the reaction of 9H-1, 6-dihydropurine-Δ6, α-propanedinitrile (3) with 2, 3-dihydrofuran, has been catalytically hydrogenated to the α-(aminomethylene)-9-(tetrahydrofuran-2-yl)-9H-purine-6-acetonitrile (5) in good yield using N, N-dimethylformamide-benzene as a solvent over Pd-C under medium pressure. Substitution of 5 with amines gave the corresponding alkylaminomethylene purines (6 and 7). Reaction of 5 with hydrazine gave the pyrazole derivative (8).