Synthesis of 2-amino-3-methoxypyrazinc

A new synthesis of 2-amiuo-3-methoxypyrazine, an intermediate in the synthesis of sulfalene, via 2-carbamido-3-hydroxy pyrazine and subsequent Hofmann rearrangement of 2-carhamido-3-methoxypyrazine, is described.     

Synthesis of 2-amino-2-cyanoadamantane and its derivatives

Synthetic routes to new amino nitriles with the functional groups at the 2-position of the adamantane core, based on reactions of adamantanonimines with acetone cyanohydrin or of adamantanone cyanohydrin with aliphatic amines, are considered. The products can be used for preparing new biologically active substances, unsymmetrical adamantyl-containing diamines or amino acids.     

New synthetic strategy for Friedlander condensation of 4-amino-2-oxo-2H-chromene-3-carbaldehyde by heterogeneous catalysis

Chromenopyridines are an important class of compound because of their diverse biological activities. In the present work, we have developed convenient route for the synthesis of chromeno[4,3-b] pyridine derivatives ( 3a – e , 5a – e , and 7a – d ) by Friedlander condensation of 4-amino-2-oxo-2H-chromene-3-carbaldehyde with various active methylene compounds. We have used mixed metal oxide catalyst such as nanomaterial Zinc titanate. The reaction was carried out for various solvent systems, also we have altered the concentration of the catalyst. The 2-propanol/water solvent system and 5 mol% catalyst concentration are best as far as yield and rate of reaction are concerned. The structures of the synthesized compounds were confirmed by ¹H NMR, ¹³C NMR, mass spectra, and elemental analysis.     

3-羟基-4-氨基丁酸及其类似物的合成进展

3-羟基-4-氨基丁酸（简称GABOB）是一类有趣的氨基酸，它的一些类似物如Statine等存在于一些具有抗肿瘤、抗病毒、抗炎症等生理活性的天然产物之中。从治疗的角度讲，3-羟基-4-氨基丁酸也具有重要意义。本文简要介绍GABOB类似物的天然存在及生理活性，并从不同的起始原料出发介绍它们的立体选择性合成。     

Synthesis of 2-amino-3-benzoylphenylacetic acid

2-Amino-3-benzoylphenylacetic acid, sodium salt was prepared from indoline through a process applicable to large scale production.     

Synthesis of substituted 2-amino-3-cyanopyrroles

A method was worked out for the preparation of substituted 2-amino-3-cyanopyrroles from N-acyl-α -amino ketones and malononitrile. Acyl derivatives of 2-amino-3-cyanopyrroles were obtained. A number of Mannich bases were synthesized by aminomethylation of 2-acetamido-3-cyano-4-phenylpyrrole.     

Synthesis of 3-amino-2-carbamoylthiophene and its reaction with cycloalkanones to form imines

3-Amino-2-carbamoylthiophene (2) was obtained in 75% yield by reaction of methyl 3-aminothiophene-2-carboxylate with saturated aqueous ammonia containing ammonium chloride catalyst at room temperature over a period of 2,3 months, Treatment of 2 with cyclopentanone, cyclohexanone, and cycloheptanone in ethanol at ^pH 3.4 gave facile formation of 2-carbamoyl-3-cycloalkylidenaminothiophenes in yields of 73%, 86%, and 60%, respectively. Infrared and ¹H nmr spectra of these imines indicate that they occur in intramolecularly hydrogen? bonded form, i.e. with chelate rings. Comparison is made with reported syntheses and reactions of 2 and its isosteric 2-aminobenzamide.     

Synthesis of 3-acetyl-2-amino-4-pyridone

A method hxsynthesizing 3-acetyl-2-amino-4-pyyridone has been suggested. The synthesis involves the condensation of dimethylformamide dimethylacetal at the NH₂ group of diphenylboron chelate diacetylketene aminal followed by its intramolecular cyclization under the action of NaOMe in MeOH.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 177–179. January, 1996.     

Synthesis of 2-amino-3-carbethoxy-1-hydroxyindoles

A general method is described for the synthesis of 2-amino-3-carbethoxy-l-hydroxyindoles by the reductive cyclization of 2-nitrophenylcyanoacetates using zinc and acetic acid at temperatures of 15–28°.     

Synthesis of derivatives of 2-amino-3-ethoxycarbonylthiophene

A number of alkylidene esters are synthesized from the corresponding ketones and cyanoacetic ester, and treatment of the esters with sulfur in the presence of a catalytic amount of diethylamine gives 2-amino-3-ethoxycarbonylthiophene derivatives.     

Synthesis and structure of substituted 2-amino-3-arylindoles

The corresponding 2-amino-3-arylindole hydrochlorides were obtained by the reaction of substituted arylacetic acid arylhydrazides with phosphorus oxychloride (the Kost reaction). The effect of substituents in the aryl rings on the rearrangement was examined qualitatively. The IR, PMR, and UV spectra of the compounds obtained are discussed in relationship with the peculiarities of their structure.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1075–1080, August, 1985.     

Synthesis of derivatives of 2-amino-3-ethoxycarbonylthiophene

A number of alkylidene esters are synthesized from the corresponding ketones and cyanoacetic ester, and treatment of the esters with sulfur in the presence of a catalytic amount of diethylamine gives 2-amino-3-ethoxycarbonylthiophene derivatives.     

Synthesis of formamidines from 2-amino-3-methylquinazolin-4-one and its 6-nitro derivative

The condensation of 2-amino-3-methylquinazolin-4-one and its 6-nitro derivative with dialkyl-, arylalkyl-, and heterylformamides has given the corresponding formamidines of the quinazolinone series. The details of the compounds synthesized are as follows X, R, R′, yield (%), mp (°C, ethanol), R_f (chloroform-methanol (20:1) Al₂O₃): empirical formula: H, CH₃, CH₃, 77, 238–240, 0.49, C₁₂H₁₄ON₄; H, C₂H₅, C₂H₅, 65, 208–210, 0.96, C₁₄H₁₈ON₄; H, CH₃, C₆H₅, 84, 162–164, 0.54, C₁₇H₁₆ON₄; H, (CH₂)₂O(CH₂)₂, 60, 196–197, 0.43, C₁₄H₁₆O₂N₄; H, (CH₂)₅, 6.6, 196–198, 0.4, C₁₅H₁₈·ON₄; NO₂, CH₃, CH₃, 64. 194–196, 0.83, C₁₂H₁₃O₃N₅; NO₂, C₂H₅, C₂H₅, 37, 142–144, 0.8, C₁₄H₁₇O₃N₅; NO₂; CH₃, C₆H₅, 38, 298, 0.88, C₁₇H₁₅O₃N₅; NO₂, (CH₂)₂O(CH₂)₂, 60, 148–150, 0.7, C₁₄H₁₅O₄N₅. Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 680–684, September–October, 1980.     

2-卤-3-氨基-2-烯丙亚胺化合物的合成

由具有2位氢的3-氨基-2-烯丙亚胺与N-氯或N-溴琥珀酰亚胺以甲苯作溶剂在常温下反应，制备了-些未见文献报道的2-氯和2-溴-3-氨基-2-烯丙亚胺，化合物结构均经元素分析，^1H NMR，^13C NMR和MS确证。     

Synthesis of 2-amino-3-fluoroacrylic acid containing peptides

[reaction: see text] Peptides containing (E)- and (Z)-3-fluorodehydroalanine have been prepared from serine via a fluoro-Pummerer rearrangement. The resulting electrophilic moieties may be useful affinity labels for the identification of the targets of dehydroamino acid containing natural products that act by covalent mechanisms.     

Synthesis and properties of 2-ethoxycarbonyl-3-amino-2,3-dehydroquinuclidine

The reduction of 2-ethoxycarbonyl-3-oxoquinuclidine oxime hydrochloride leads to 2-ethoxycarbonyl-3-amino-2,3-dehydroquinuclidine, from which pyrimido[5,4-b]quinuclidine derivatives were obtained by reaction with formamide, methyl isocyanate, and phenyl isothiocyanate. It is shown that 7-hydroxypyrazolo[4,3-b]quinuclidine is formed in the reaction of 2-ethoxycarbonyl-3-acetamido-2,3-dehydroquinuclidine with hydrazine hydrate.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 971–974, July, 1983.