• Natural Product Sciences
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• 제4권3호
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• pp.170-173
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• 1998

A new derivative of allo-inositol has been isolated from the aerial parts of Stocksia brahuica and named as brahol (1). The structure of 1 was elucidated with the help of extensive 2D-NMR spectroscopic techniques and identified as 5-O-methyl-allo-inositol. The structure was reconfirmed by acetate derivative (2).

• Archives of Pharmacal Research
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• 제21권6호
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• pp.723-728
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• 1998

The chemical behaviours of 4-methyl-2-oxo-2H-benzopyran-7-yl oxoacetyl hydrazine (2) towards some different reagents such as anhydride compounds, aromatic aldehydes, carb on disulphide, and nitrous acid yielded the corresponding pathalazine derivatives (3, 4, 5), hydrazone derivative (6), 1,3,4-oxadiazole derivative (7, 8, 9) and acid azide (10) respectively. Treatmen of 10 with absolute alcohols, amines and ethyl amino acid ester gave the corresponding carbamate derivative (11), substituted urea derivative (12) and ethyl substituted alkyl acetate (13) respectively. The biological activity of some synthesized compounds was evaluated.

• 약학회지
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• 제6권1호
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• pp.25-27
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• 1962

The derivative of glycyrrhetinic acid which have similar effects of desoxycorticosterone acetate was prepared glycyrrhetinyl chloride by the chlorination with thionyl chloride at low temperature. 2-Acetyl-11-keto-.DELTA. : 13 oleanolic ketol acetate (30) was synthesized by diazotating glycyrrhetinyl chloride with diazomethan and the acetylation with anhydro acetic acid. 2-Acetyl-.DELTA.12 : 13 oleanolic ketol acetate (28) was synthesized by chlorinating oleanolic acid with thionyl chloride, and by diazotatating oleanolyl chloride with diazomethan and the acetylation with anhydroacetic acid.

• Archives of Pharmacal Research
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• 제28권11호
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• pp.1205-1212
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• 2005

2-Thiouracil-5-sulphonic acid N-(4-acetylphenyl) Amide (1) was reacted with a series of aromatic aldehydes giving chalcones 2 (Claisen-Schemidt reaction), some of these chalcones were reacted with urea and thiourea giving pyrimidine-2-one and pyrimidine-2 thione derivatives respectively of the type 3a,b and 4a,b. In addition many chalcones were reacted with hydroxylamine hydrochloride giving isoxazoline derivatives 5a,b. They could also reacted with phenylhydrazine to give pyrazoline derivatives 5a,b, chalcones also were reacted withethylcyano acetate and/or malononitryl in pyridine giving pyran derivatives 7a,c and 8a,c. In another pathway chalcones were epoxidised by $H_{2}O_{2}$ giving epoxides 9a,c which in turn were reacted with phenylhydrazine giving 4-hydroxypyrazoline derivatives 10a,c. In another reaction chalcones were reacted with ethylcyanoacetate in presence of amm.acetate giving pyridone derivatives 11a,d which could be prepared also in exellent yield from compound 1 by its reaction with certain aromatic aldehydes and ethylcyanoacetate in presence of ammonium acetate. Finally, compound 1 was reacted with semicarbazide giving semicarbazone intermediate 12 which in turn was reacted with thionyl chloride giving thiadiazole derivative 13. The biological effects of some of the new synthesized compounds were also investigated.

• 대한화학회지
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• 제38권6호
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• pp.449-455
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• 1994

효소를 이용한 생리활성 펩티드의 합성 연구에 관한 기초자료를 얻기 위하여, Kyotorphin(진통작용을 가진 펩티드) 유도체가 $\alpha-chymotrysin$를 이용한 이상계(two phase system;유기상과 수용액상)조건하에서 Ac-Tyr-OH 와 $Arg-NH_2$로부터 합성되었다. Ac-Tyr-OH(10 mM)과 $Arg-NH_2$ (20 mM)와의 Kyotorphin 유도체 합성에 대한 유기용매의 효과에서 ethyl acetate계에서의 합성 수율이 다른 유기용매(dichloromethane, n-butanol, n-hexane, chloroform)에서 보다도 더 높았다. Kyotorphin 유도체의 합성에 미치는 최적조건을 보면, 효소 농도는 10 ${\mu}M$, 온도 및 pH는 각각 $35^{\circ}C$ 및 7.0이었으며, 유기상/수용액상의 비$(\alpha)$는 15였다. Kyotorphin 유도체 합성의 최적 반응조건하에서 수율은 70.2%였으며, 이때의 반응은 24시간 후에 평형에 도달하였다.

• 대한화학회지
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• 제53권3호
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• pp.308-324
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• 2009

현재 수행하는 작업은 피페리딘 또는 암모늄 아세테이트 존재하에서 malononitrile와 $\beta$- aroylacrylic acid 유도체의 DMF 용매조건에서 상호작용에 대한 연구이며, 형성된 화합물을 이용한 퓨즈 되고 단리된 이중고리화 시스템의 합성에 관한 것이다. $\beta$-aroylacrylic acid (3)이 DMF 용매와 피페리딘 촉매조건에malononitrile와 반응하여 4H-피란유도체(4)를 형성한다. 촉매를 암모늄아세테이트로 바꿈으로서 피리딘 유도체를 얻었다. 또한 N-말레암산 유도체 (19)와 (27)은 말레 무수물과 함께 (4)와 (5)의 반응을 경유하여 합성되었다. 마이클 첨가 반응에서 이용되는 메틸렌화합물에 관한 이 연구는 B-aroylacrylic acid의 경우와 유사하게 형성된 말레암산 유도체의 반응성에 대한 것이다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2005년도 제25회 추계학술대회논문집
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• pp.9-12
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• 2005

본 연구에서는 셀룰로오즈 유도체로 사용되어지는 cellulose acetate butyate (CAB), cellulose acetate propionate (CAP), nitrocellilose (GC-519)의 분자량에 의한 유변학적 특성의 영향을 분석하기 위하여 각각의 셀룰로오즈 유도체를 Gel Permeartion Chromatography (GPC)를 이용하여 각각의 분자량을 측정하였다. GPC를 이용하여 셀룰로오즈 유도체의 중량평균분자량 (Mw)과 수평균분자량 (Mn)을 측정하였다. 각각의 셀룰로오즈 유도체에 가소제인 di-n-propyl adipate (DNPA)를 첨가한 뒤 아세톤에 녹여 레오미터를 이용하여 $0^{\circ}C$에서 가소제가 포함된 셀룰로오즈 유도체의 유변학적 특성을 측정하였다.

• Journal of Microbiology and Biotechnology
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• 제27권6호
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• pp.1065-1070
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• 2017

This study aimed to examine the anti-candidal efficacy of a novel ketone derivative isolated from Diaporthe sp. ED2, an endophytic fungus residing in medicinal herb Orthosiphon stamieus Benth. The ethyl acetate extract of the fungal culture was separated by open column and reverse phase high-performance liquid chromatography (HPLC). The eluent at retention time 5.64 min in the HPLC system was the only compound that exhibited anti-candidal activity on Kirby-Bauer assay. The structure of the compound was also elucidated by nuclear magnetic resonance and spectroscopy techniques. The purified anti-candidal compound was obtained as a colorless solid and characterized as 3-hydroxy-5-methoxyhex-5-ene-2,4-dione. On broth microdilution assay, the compound also exhibited fungicidal activity on a clinical strain of Candida albicans at a minimal inhibitory concentration of $3.1{\mu}g/ml$. The killing kinetic analysis also revealed that the compound was fungicidal against C. albicans in a concentration- and time-dependent manner. The compound was heat-stable up to $70^{\circ}C$, but its anti-candidal activity was affected at pH 2.

• 약학회지
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• 제1권1호
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• pp.1-2
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• 1948

The finely powdered entire harbs of Polygala japonica Houttuyn, a drug known as Yong Shin-Cho in Korea, were boiled with methanol and from the filtered extract the methanol was distilled off under diminished pressure and the aqueous solution of the residue was evaporated to dryness after being mixed with ignited magnesia. The dried mass was boiled with absolute alcohol, the filtered clear liquid was evaporated to a small volume and the precipitate Saponin produced by mixing with ether was filtered off. When the filtrate was again evaporated to the thickness of a syrup and allowed to cool for a few days in an ice box, crystalls were separated out in about 5% yield, which formed colorless columns, M. P. 142.deg., from methanol and had the formula $C_{6}$ $H_{12}$ $O_{5}$. On heating it with acetic acid anhybride and sodium acetate, its tetraacetyl derivative $C_{6}$ $H_{8}$ $O_{5}$(C $H_{3}$CO)$_{4}$ was obtained and which formed colorless needles, M. P. 62-5.deg., from ethanol. Their melting points, results of elementar analysis and other characteristics agreed with that of Polygalitol and its derivative. Finally they were proved to be identical with Polygalitol and its derivative, respectively, through determination of mixed melting points with the samples. Polygalitol was isolated from several plants of genus polugala e. g. P. amara, P. vulgaris, P. teunifolia, P. senega etc. The authors added to them another instance of identifying Polygalitol from the plant of genus polygala.olygala.

• Journal of Microbiology and Biotechnology
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• 제18권2호
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• pp.334-337
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• 2008

A tightly regulated gene expression system composed of a single-copy target gene under the control of a lac promoter derivative and lacI gene in a multicopy plasmid is proposed, and its ability to control the flux of a metabolic pathway is demonstrated. A model system to control the flux of acetyl-CoA to acetyl phosphate was constructed by integrating pta, a gene encoding phosphotransacetylase, under a tac promoter into the chromosome of E. coli with a pta-negative background and transforming a multicopy plasmid containing the $lacI^Q$ gene into the strain. The production rate of acetate was shown to be tightly controlled when varying the concentration of the inducer (IPTG) in he model system.