巻号一覧
50 巻, 1 号
選択された号の論文の8件中1～8を表示しています
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1992 年 50 巻 1 号 p. 2-13
発行日: 1992/01/01
公開日: 2009/11/16
ジャーナル フリーPDF形式でダウンロード (1988K) -
野平 博之1992 年 50 巻 1 号 p. 14-23
発行日: 1992/01/01
公開日: 2009/11/16
ジャーナル フリーSome new methods and practical strategies for the efficient resolution of a wide variety of organic componds by means of such crystallization procedures as preferential crystallization, diastereomeric salt formation and their combination are described. Utilizing the organic compounds with high optical purities thus obtained, application study in the following field has been performed;1) verification of the Brewster's theory of optical activity, 2) syntheses of pharmaceutical, agricultural and perfuming chemicals, 3) preparation of optical purity determining agents, 4) preparation of atropisomeric bis (triarylphosphine) as a catalyst for asymmetric hydrogenation, 5) syntheses of ferroelectric liquid crystals. In this article, an outline of our investigation in the above mentioned fields is also described.抄録全体を表示PDF形式でダウンロード (1073K) -
沢井 宏明, 篠塚 和夫1992 年 50 巻 1 号 p. 24-34
発行日: 1992/01/01
公開日: 2009/11/16
ジャーナル フリーThis review article describes preparation and modification of oligonucleotides by condensation in aqueous solution. Nucleotides and oligonucleotides are generally soluble in water, but not in organic solvents. Reactions in aqueous solution are therefore indispensable. Condensation in aqueous media is thermodynamically unfavorable. Several methods have been devised to overcome this problem. Large amount of water soluble condensing agents such as EDC or cyanogen bromide are employed for the condensation of oligonucleotides. Use of imidazole-activated nucleotides is an another approach for the preparation and the modification of oligonucleotides. The control of pH of the reaction media is necessary to accomplish the efficient and regioselective condensation. Metal ions or polynucleotide template, wihch organize the substrate nucleotides by complex formation promote the target condensation.抄録全体を表示PDF形式でダウンロード (1445K) -
榊原 章人, 安藤 亘1992 年 50 巻 1 号 p. 35-47
発行日: 1992/01/01
公開日: 2010/01/28
ジャーナル フリーCyclic silicon compounds containing heteroatoms (N, P, S), as cyclosilazanes, cyclosilaphosphanes, and cyclosilthianes have been energetically investigated as synthetic targets in a field of silicon chemistry. In the interest of chemical industry, cyclosilazanes as well as cyclosiloxanes are useful in the preparation of linear polymer. The importance of polysilazanes as preceramic materials is well-konwn. But the possibility of cyclosilaphosphanes and cyclosilthianes as the industrial materials have not been discussed in detail.
In this review, the recent developments in the field of cyclic silicon compounds containing heteroatoms (N, P, S) are summarized from the above point of view.抄録全体を表示PDF形式でダウンロード (1550K) -
富永 義則, 北條 信, 細見 彰1992 年 50 巻 1 号 p. 48-60
発行日: 1992/01/01
公開日: 2009/11/16
ジャーナル フリーVarious organosilicon compounds act as synthetic equivalents of unstable active chemical species, especially novel 1, 3-dipolar reagents such as azomethine ylides, thiocarbonyl ylides and related reagents, are designed and synthesized. These compounds activated by a Lewis acid or fluoride ion react with a variety of dipolarophiles and hetero-dipolarophiles in highly regio- and stereospecific mode. It has been found that this methodology can be extended to the design and preparations of tailor-made 1, 3-dipolar reagents. The highly selective synthesis of heterocycles are described.抄録全体を表示PDF形式でダウンロード (1353K) -
川村 邦昭, R.J. DeVita, A.S. Kende1992 年 50 巻 1 号 p. 61-70
発行日: 1992/01/01
公開日: 2009/11/16
ジャーナル フリーThe first enantioselective total synthesis of neooxazolomycin (1), structurally unique antitumor agent isolated from streptomyces sp., is described. The key steps of the synthesis involve the following newly developed synthetic methods : i) the novel dianion cyclocondensation reaction of amide-malonate 3 with ester 36 followed by stereoselective lactonization to give the fused bicyclic lactam-lactone terminus, ii) the four carbon homologation of aldehyde 41 to E, E-dienamide 45 via vinyliodide 43 by means of the mild Pd-catalyzed coupling with the vinylstannane 13, (iii) the diastereoselective Reformatsky type aldol reaction of Z-enal 48 with the tin (II) enolate derived from chiral oxazolidinone 15 to give R, S-oxazinedione 51. Utilizing the above key reactions and further manipulations afforded the right half amine 71 and the left half acid 68 in proper chiral form. Finally, the amide formation of them followed by deprotection gave the synthetic neooxazolomycin (1).抄録全体を表示PDF形式でダウンロード (1250K) -
平山 吉彦, 河野 之伴1992 年 50 巻 1 号 p. 71-73
発行日: 1992/01/01
公開日: 2010/01/28
ジャーナル フリーこの薬品はIUPAC命名法ではジアゾジフェニルメタン, CA索引名ではベンゼン, 1, 1'- (ジアゾメチレン) ビス-, 慣用名ではジフェニルジアゾメタン (以下DDMと略す) である。DDMは1965年にペプチドのカルボキシル基部位の保護基として有用であることが知られた。その後, 1971年, メルク社によって抗生物質の製法に用いられたが, 自己分解性のために窒素を放出し, 又爆発性化合物特有の原子団を持つために工業的に広く使用されるには至らなかった。1981年, 筆者らは労働省産業安全研究所, および工業技術院化学技術研究所に危険性評価試験を依頼して得た知見に基づき製造方法, 結晶として取り出す方法, 貯蔵, 運搬, 取り扱い方法を確立した。今では98.0%以上の高純度品を工業的規模で製造している。抄録全体を表示PDF形式でダウンロード (299K) -
野平 博之, 川村 邦昭1992 年 50 巻 1 号 p. 74
発行日: 1992/01/01
公開日: 2009/11/16
ジャーナル フリーPDF形式でダウンロード (168K)
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