- Method for synthesizing 1-amino-4-methylpiperazine from chlorosuccinimide, ammonia water and 1-methyl-piperazine in one step
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The invention relates to a method for synthesizing 1-amino-4-methylpiperazine from chlorosuccinimide, ammonia water and 1-methyl-piperazine in one step, which is characterized by comprising the following steps: stirring NCS and ammonia water to react in the presence of gelatin in a strong alkaline environment, conducting extracting by using an ether solvent, dropwise adding a 1-methyl-4-piperazine solution, conducting stirring to react from low temperature to room temperature, and finally, carrying out vacuum distillation separation to obtain the target product 1-amino-4-methylpiperazine. The one-step method is innovatively used for preparing the 1-amino-4-methylpiperazine, and compared with a traditional synthesis method, the method is more environmentally friendly and safer, and the cost is saved.
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Paragraph 0033-0044
(2021/11/26)
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- Method for synthesizing 1-amino-4-methylpiperazine through catalytic hydrogenation
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The invention relates to a method for synthesizing 1-amino-4-methylpiperazine through catalytic hydrogenation. The invention discloses the green synthesis method for synthesizing 1-amino-4-methylpiperazine by hydrogenating 1-methyl-4-nitrosopiperazine in a water and organic mixed solvent system under the catalysis of an iron oxide and ferrous oxide supported palladium catalyst, wherein the methodcomprises the steps: adding 1-methyl-4-nitrosopiperazine into a paramagnetic Pd/Fe3O4-FeO catalyst, carrying out a hydrogenation reaction in a three-phase system of water, an organic solvent and the catalyst at a certain temperature, and finally, carrying out reduced pressure distillation separation to obtain the target product 1-amino-4-methylpiperazine. The 1-amino-4-methylpiperazine is preparedby innovatively using a catalytic hydrogenation method in a three-phase system, and compared with a traditional synthesis method, the method is more environmentally friendly and safer, and the cost is saved.
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Paragraph 0044-0046; 0068
(2020/07/28)
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- Optimization of biaryloxazolidinone as promising antibacterial agents against antibiotic-susceptible and antibiotic-resistant gram-positive bacteria
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We previously discovered a series of novel biaryloxazolidinone analogues bearing a hydrazone moiety with potent antibacterial activity. However, the most potent compound OB-104 exhibited undesirable chemical and metabolic instability. Herein, novel biaryloxazolidinone analogues were designed and synthesized to improve the chemical and metabolic stability. Compounds 6a-1, 6a-3, 14a-1, 14a-3 and 14a-7 showed significant antibacterial activity against the tested Gram-positive bacteria as compared to radezolid and linezolid. Further studies indicated that most of them exhibited improved water solubility and chemical stability. Compound 14a-7 had MIC values of 0.125–0.25 μg/mL against all tested Gram-positive bacteria, and showed excellent antibacterial activity against clinical isolates of antibiotic-susceptible and antibiotic-resistant bacteria. Moreover, it was stable in human liver microsome. From a safety viewpoint, it showed non-cytotoxic activity against hepatic cell and exhibited lower inhibitory activity against human MAO-A compared to linezolid. The potent antibacterial activity and all these improved drug-likeness properties and safety profile suggested that compound 14a-7 might be a promising drug candidate for further investigation.
- Wu, Yachuang,Ding, Xiudong,Yang, Yifeng,Li, Yingxiu,Qi, Yinliang,Hu, Feng,Qin, Mingze,Liu, Yajing,Sun, Lu,Zhao, Yanfang
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- Selective reduction of N-nitroso aza-aliphatic cyclic compounds to the corresponding N-amino products using zinc dust in CO2–H2O medium
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[Figure not available: see fulltext.] A new method for reduction of N-nitroso aza-aliphatic cyclic compounds employing zinc in pressurized CO2–H2O medium has been developed. H2O and NH4Cl were used as hydrogen donors, and reduction was performed under environmentally benign conditions. The presented approach allowed to obtain the respective N-amino products selectively and in excellent yields (up to 97%).
- Yang, Weiqing,Lu, Xiang,Zhou, Tingting,Cao, Yongjing,Zhang, Yuanyuan,Ma, Menglin
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p. 780 - 783
(2018/10/20)
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- Oxazolidinone compound containing combined aromatic hydrazine and its preparation method
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The invention relates to oxazolidinone compound containing combined aromatic hydrazine shown in general formula I, its optical isomer, pharmaceutical acceptable salt and/or solvent compound, and it preparation method, and the drug composition containing the compound, wherein the substituent groups R1, R2, R3, X and A rings have the meaning given in the specification. The invention further relatesto the compound, the substituent group, solvent compound or application of its prodrug using as antibacterial drug in treatment, and application of treating gram positive bacterial infection and mycobacterium tuberculosis infection especially.
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Paragraph 0121-0122
(2018/04/03)
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- Synthesis and antibacterial activity evaluation of novel biaryloxazolidinone analogues containing a hydrazone moiety as promising antibacterial agents
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A series of linezolid analogues containing a hydrazone moiety were designed, synthesized and evaluated for their antibacterial activity. Most compounds exhibited more potent antibacterial activity against S.aureus, MRSA, MSSA, LREF and VRE pathogens as compared with linezolid and radezolid. Compounds 9a, 9c, 9f, 9g, 10m and 10t were more potent against tested clinical isolates of MRSA, MSSA, VRE and LREF as compared to linezolid. Compound 9a exhibited comparable activity with linezolid against human MAO-A for safety evaluation and showed moderate metabolism in human liver microsome. The most promising compound 9a showed remarkable antibacterial activity against S.aureus, MRSA, MSSA, LREF and VRE pathogens with MIC value of 0.0675 mg/mL, respectively, which was 15- to 30-fold more potent than linezolid.
- Wu, Yachuang,Ding, Xiudong,Ding, Liang,Zhang, Yongsheng,Cui, Lei,Sun, Lu,Li, Wei,Wang, Di,Zhao, Yanfang
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p. 247 - 258
(2018/09/18)
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- Preparation of 1-amino-4-methylpiperazine
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The selectivity of the formation of N-di(2-chloroethyl)methylamine in reactions with various chlorinating agents has been investigated and the optimum chlorinating agent has been found. 1-Amino-4-methylpiperazine has been obtained for the first time by the cyclization of N-di(2-chloroethyl)methylamine with aqueous hydrazine. A possible mechanism has been proposed for the cyclization reaction. 2004 Springer Science+Business Media, Inc.
- Kushakova,Chernobroviy,Kuznetsov,Garabadgiu
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p. 1546 - 1549
(2007/10/03)
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- SYNTHESIS OF 4-METHOXYPHENOXYACETIC AND 3,4,5-TRIMETHOXYPHENOXYACETIC ACID AMIDES AND HYDRAZIDES AS POTENTIAL NEUROTROPIC AND CARDIOVASCULAR AGENTS
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4-Methoxyphenoxyacetyl chloride, 3,4,5-trimethoxyphenoxyacetic acid and its methyl ester were reacted with 2-phenylethylamine, 1-benzylpiperazine, 1-(2-phenylethyl)piperazine, 1-(1-phenyl-2-propyl)piperazine, isopropylhydrazine, 1-aminopiperidine, and 4-aminomorpholine and afforded the amides and hydrazides Iab-IVab and Vb-VIIIb. 1-Amino-4-methylpiperazine and 1-amino-4-phenylpiperazine were transformed to the hydrazones XV and XVI, and to the quaternary salts XVII and XVIII.Pharmacological screening showed indications of thymoleptic acitivity with compounds Ia-IIIa, anorectic effect with IIa and IIIb, antiarrhytmic activity with IIIa, XVII, and XVIII, and myorelaxant effect with XVII and XVIII.Antimicrobial and anthelmintic effects were also noted.
- Valenta, Vladimir,Holubek, Jiri,Svatek, Emil,Protiva, Miroslav
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p. 3013 - 3023
(2007/10/02)
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- 3-aryl-7-chloro-3,4-dihydroacridine-1,9(2H,10H)-dione 1-oximes and 1-hydrazone derivatives, their salts, a process for their preparation, agents containing them and their use
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3-Aryl-7-chloro-3,4-dihydroacridine-1,9(2H,10H)-dione 1-oximes and 1-hydrazone derivatives of the formula I STR1 and their physiologically tolerated acid addition and ammonium salts are described, as is a process for their preparation. The new compounds are chemotherapeutic agents and are active against protozoa, especially malaria plasmodia.
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- SUBSTITUTED THIENOBENZODIAZEPINONES AND SALTS THEREOF
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Compounds of the formula STR1 wherein R is 1-methyl-4-piperididinyl, 4-methyl-1-piperazinyl, or 3-or 3-tropanyl, each of which may optionally have another methyl substituent attached to the heterocyclic ring;R 1 is hydrogen or alkyl of 1 to 4 carbon atoms;R 2 is hydrogen, halogen or alkyl of 1 to 4 carbon atoms; andX is oxygen,--NH--or--N(CH. sub.3)--;and non-toxic, pharmacologically acceptable acid addition salts thereof. The compounds as well as their salts are useful as anti-ulcerogenics.
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- Biologically active compounds
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Biologically active geldanamycin derivatives of Formula III, SPC1 wherein R5, R6, R7 and R8 are the same or different and selected from hydrogen, hydroxy, halo, alkyl, alkoxy, carboxyl, carboalkoxyl, amino, amido, or N-alkylsubstituted amido; pharmaceutical compositions and therapeutic methods involving the same.
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