2-氟-6-三氟甲基苄胺的合成新方法

以2-甲基-3-三氟甲基苯胺（1）为原料,经Balz-Schiemann反应制得3-氟-2-甲基三氟甲苯（3）;3经溴代制得2-氟-6-三氟甲基苄溴(4）,最后经Gabriel反应合成2-氟-6-三氟甲基苄胺,总收率53.4%,其结构经¹H NMR和MS(ESI)确证。     

铟粉促进下“一锅法”合成α-亚甲基-γ-三氟甲基-γ-丁内酰胺化合物

探索了铟粉促进下,三氟乙醛甲基半缩醛或三氟苯乙酮与酰肼、2-(溴甲基)丙烯酸乙酯的"一锅法"反应,得到了一系列α-亚甲基-γ-三氟甲基-γ-丁内酰胺化合物.该方法使用价廉易得的三氟乙醛甲基半缩醛或三氟苯乙酮作为三氟甲基合成砌块,反应条件温和、产率高、操作简单,为合成含三氟甲基的α-亚甲基-γ-丁内酰胺化合物提供了一种新方法.     

微波辐射下合成2-芳甲酰氨基-5-(2-三氟甲基苯并咪唑-1- 亚甲基)-1,3,4-噻二唑

微波辐射下, 1-肼羰亚甲基-2-三氟甲基苯并咪唑与芳酰基异硫氰酸酯反应合成了1-(2-三氟甲基苯并咪唑-1-乙酰基)-4-芳酰基氨基硫脲(1a～1j), 继而在乙酸中合环得到了一系列的2-芳甲酰氨基-5-(2-三氟甲基苯并咪唑-1-亚甲基)-1,3,4-噻二唑(2a～2j), 反应时间短, 产率高, 副反应少. 标题化合物经元素分析, IR, 1H NMR确证结构.     

四氟乙烯齐聚体的反应 VIII: 2-(1'-烯丙氧基)四氟乙基-3-三氟甲基-3-五氧乙基全氟-1-戊烯分子内[2+2]环化加成反应

研究了2-(1'-烯丙氧基四氟乙基)全氟-3-甲基-1-戊烯的分子内环加成反应, 反应温度低于100℃时, 未发现重排产物, 在140℃时发生分子内环加成, 得到1-(1'-三氟甲基1'-戊基氟乙基)-戊基氟丙基-2-三氟甲基-2-氟代-7,7-二氟代-3-氧杂二环庚烷[3,2,0]以及相应的二环庚烷[3,1,1]和分子间[2+2]环加成产品.     

3-(2-氯-4-三氟甲基苯氧基)苯甲酸酯的合成、晶体结构及生物活性

以3-(2-氯-4-三氟甲基苯氧基)苯甲酸为起始原料,经氯化亚砜氯化后得中间体3-(2-氯-4-三氟甲基苯氧基)苯甲酰氯(1),再与不同取代的苯酚反应,合成了13个未见文献报道的3-(2-氯-4-三氟甲基苯氧基)苯甲酸酯(2).通过1H NMR,IR,EI-MS和元素分析对所合成的化合物进行了结构表征,3-甲基苯基3-(2-氯-4-三氟甲基苯氧)苯甲酸酯(2f)通过单晶X射线衍射进一步确证结构.初步的除草活性测试结果表明:大多数目标化合物在1.5 kg/ha剂量下对双子叶植物油菜和苋菜具有较高的抑制活性.     

α′-三氟甲基含氟β-二酮的合成

为了合成手性含氟β-二酮顺磁性镧系螯合物作为~1H NMR手性位移试剂,我们曾试图用2-三氟甲基-3-氧杂八氟己酸乙酯与3,3-二甲基-2-丁酮(1)在乙醇钠存在下进行Claisen酯缩合反应合成β-二酮,结果只发生氟仿型反应,生成碳酸二乙酯.若用三氟乙酸乙酯与1,I,1-三氢_3,6-二(三氟甲基)-4,7-二氧杂-2-十一氟癸酮在乙醇钠存在下反应,也得到氟仿型反应产物2-氢-5-三氟甲基-3,6-二氧杂-十四氟壬烷(2).本文采用碱性较弱的     

银催化下三氟甲基取代的2-咪唑啉化合物的合成

探索了银盐催化下,三氟甲基酰腙与异氰基乙酸乙酯的[3+2]环加成反应,合成了一系列三氟甲基取代的2-咪唑啉化合物.该方法具有反应速度快、产率高和立体选择性好等特点,为合成三氟甲基取代的2-咪唑啉类化合物提供了一种快速有效的新方法．     

新型N-取代苯基-苯磺酰脲类化合物的合成

以4-氟苯磺酰氯或4-三氟甲基苯磺酰氯为原料,经氨化反应制得4-氟苯磺酰胺（2a）和4-三氟甲基苯磺酰胺（2n）;不同取代苯胺分别与三光气（BTC）反应制得一系列取代苯基异氰酸酯（4a~4m, 4t和4I）; 2分别与4经缩合反应合成了27个新型的N-取代苯基-4-氟（或三氟甲基）苯磺酰脲类化合物,其结构经1H NMR, IR和ESI-MS表征。     

α-三氟甲基-α-羟基Weinreb酰胺的合成研究

探索了三氟甲基三甲基硅烷与α-羰基Weinreb酰胺选择性三氟甲基化反应,合成了一系列α-三氟甲基-α-羟基Weinreb酰胺类化合物,并考察了其作为三氟甲基合成砌块与有机金属试剂的反应.     

铬(Ⅲ)含β-二酮混合配体配合物的合成和表征(Ⅱ)

首次合成了九种[Cr(β-dik)Cl_2L_2]型混合配体配合物。其中五种是:L为γ-甲基吡啶,β-dik分别为乙酰丙酮、苯甲酰丙酮、三氟乙酰丙酮、2-噻吩甲酰三氟丙酮、1,1,1,2,2,3,3-七氟-7,7-二甲基-4,6-辛二酮;四种是:L分别为N,N-二甲基甲酰胺,N,N-二甲基乙酰胺,β-dik分别为苯甲酰丙酮和2-噻吩甲酰三氟丙酮。并对上述配合物进行了电子光谱、红外光谱的表征工作。     

Reaction of 3,3-dialkyl-6-trifluoromethyl-2,3-dihydro-4-pyrones with hydrazine hydrate

3,3-Dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrones react with hydrazine hydrate to give 2-hydrazino-2-trifluoromethyl-4-tetrahydropyrone hydrazones. When heated, the latter are transformed into 3(5)-(2-hydroxyethyl)-5(3)-trifluoromethylpyrazoles, while their treatment with HCl in ether leads to 3,3-dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrone azines.     

Synthesis of isomerically pure 3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acid derivatives via the reaction of 4-aryl-6-trifluoromethyl-2-pyrones with sodium azide

Treatment of 4-aryl-6-trifluoromethyl-2-pyrones with sodium azide in DMSO afforded the corresponding (Z)-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acids in good yields. Similarly, 4-aryl-3-carbethoxy-6-trifluoromethyl-2-pyrones smoothly reacted with sodium azide in acetonitrile to produce (E)-2-ethoxycarbonyl-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acids in high yields, whereas their reactions in ethanol, accompanied by a configurational change, gave the thermodynamically more stable (Z)-2-ethoxycarbonyl-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acids.     

7-Trifluoromethyl-5-phenyl-2-oxo-(1H)-oxazolo[5,4-b]pyridine and some of its properties

The potassium salt of 7-trifluoromethyl-5-phenyl-2-oxooxazolo[5, 4-bjpyridine (IV) was prepared from 3-aminocarbonyl-4-trifluoromethyl-6 phenyl-2(1H)-pyridone by the Hofmann reaction and was converted into 3-anuno-4-trifluoromethyl-6-phenyl-2(1H)-pyridone without isolation. 1-Substituted 7-trifluoromethyl-5phenyl-2-oxooxazolo[5, 4-b]pyridines were formed by alkylation of salt IV. 6-Halogeno-7-trifluoromethyl-S phenyl-2-oxo(1H)-oxazolo[5,4-b]pyridines have been prepared.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 542–545, April. 1996.     

Synthesis of 5-Phenyl-7-trifluoromethyl-2,3-dihydroimidazo[1,2-a]pyridines

Syntheses are reported for a series of 2-alkylamino-6-phenyl-4-trifluoromethylpyridines. The reaction of 3-cyano-2-(hydroxyalkylamino)-6-phenyl-4-trifluoromethylpyridines with thionyl chloride gave the corresponding 2-(chloroalkylamino)pyridines, 8-cyano-5-phenyl-7-trifluoromethyl-2,3-dihydro-imidazo[1,2-a]pyridines, and 9-cyano-6-phenyl-8-trifluoromethyl-2,3,4-trihydropyrido[1,2-a]-pyrimidines. X-ray diffraction structural analysis was used to study 8-cyano-5-phenyl-7-trifluoromethyl-2,3-dihydroimidazo[1,2-a]pyridine.     

First Example of the Synthesis of Di(fluoroalkyl)-substituted Pyrimidines

4,5-Bis(hydroxy)-4-trifluoromethyl-6-(fluoroalkyl)hexahydropyrimidin-2-ones (thiones) have been obtained for the first time by the reaction of ureas (thioureas) with di(fluoroalkyl)-substituted 1,3-diketones and tetraols, the dehydration of which gave 2-hydroxy(mercapto)-4-trifluoromethyl-6-(fluoroalkyl)pyrimidines.     

2-Polyfluoroalkylchromones. 8. 2-Trifluoromethyl- and 6-nitro-2-trifluoromethylchromones in reactions with amines

The reactions of 6-nitro-2-trifluoromethylchromone with benzylamine, ethanolamine, and aniline afforded 3-benzyl(2-hydroxyethyl,phenyl)amino-4,4,4-trifluoro-1-(2-hydroxy-5-nitrophenyl)but-2-en-1-ones, respectively, whereas the reactions with ethylenediamine and diethylenetriamine gave rise to 5-(2-hydroxy-5-nitrophenyl)-7-trifluoromethyl-2,3-dihydro-1H-1,4-diazepine and 5-(2-hydroxy-5-nitrophenyl)-7-trifluoromethyl-1,4,8-triazabicyclo[5.3.0]dec-4-ene, respectively. Morpholine added at the double bond of 2-trifluoromethyl- and 6-nitro-2-trifluoromethylchromones to form 2-morpholino-2-trifluoromethylchroman-4-one and its 6-nitro-substituted analog, respectively, whereas piperidine reacted only with 2-trifluoromethylchromone to yield 2-piperidino-2-trifluoromethylchroman-4-one.     

Reactions of regioisomeric 3,3-dimethyl- and 2,2-dimethyl-6-trifluoromethyl-2,3-dihydro-4-pyrones with N-nucleophiles

Reactions of 2,2-dimethyl-6-trifluoromethyl-2,3-dihydro-4-pyrone with ethylenediamine, hydrazine, or hydroxylamine yield 5-methyl-7-trifluoromethyl-2,3-dihydro-1H-1,4-diazepine, 3(5)-(2-hydroxy-2-methylpropyl)-5(3)-trifluoromethylpyrazole, and 5-hydroxy-3-(2-hydroxy-2-methylpropyl)-5-triflouromethyl-Δ², respectively. The same compounds were obtained from 2-amino-1,1,1-trifluoro-6-hydroxy-6-methylhept-2(Z)-en-4-one and 2-hydroxy-6, 6-dimethyl-2-trifluoromethyltetrahydro-4-pyrone.     

Stereoselective Synthesis and Alkylation of N-Methylmorpholinium 4,5-trans-4-(2-chlorophenyl)-3-cyano-6-hydroxy-5-(2-thenoyl)-6-trifluoromethyl-1,4,5,6-tetrahydropyridine-2-thiolate. Molecular and Crystal Structure of 4,5-trans-4-(2-chlorophenyl)-3-cyano-6-hydroxy-2-methallylthio-5-(2-thenoyl)-6-trifluoromethyl-1,4,5,6-tetrahydropyridine

The condensation of 2-chlorobenzaldehyde with cyanothioacetamide and 2-thenoyltrifluoroacetone in the presence of N-methylmorpholine takes place stereoselectively and leads to the formation of N-methylmorpholinium 4,5-trans-4-(2-chlorophenyl)-3-cyano-6-hydroxy-5-(2-thenoyl)-6-trifluoromethyl-1,4,5,6-tetrahydropyridine-2-thiolate. The latter was used to synthesize the corresponding 2-alkylthiotetrahydropyridines. The structure of 4,5-trans-4-(2-chlorophenyl)-3-cyano-6-hydroxy-2-methallylthio-5-(2-thenoyl)-6-trifluoromethyl-1,4,5,6-tetrahydropyridine was determined by X-ray crystallographic analysis.     

First synthesis of 4-oxo-6-trifluoromethyl-4H-thiopyran-2-carboxylic acid and its derivatives

Treatment of 6-trifluoromethylcomanic acid with sodium hydrosulfide afforded for the first time 4-oxo-6-trifluoromethyl-4H-thiopyran-2-carboxylic acid (6-trifluoromethylthiocomanic acid). When heated or treated with H₂SO₄, this acid easily underwent decarboxylation leading to 2-trifluoromethyl-4H-thiopyran-4-one. Because of this, both ethyl and methyl 6-tri-fluoromethylthiocomanates were obtained in low yields (15–23%). Decarboxylation of 6-tri-(di)fluoromethylcomanic acids gave 2-tri(di)fluoromethyl-4H-pyran-4-ones in 77–80% yields.     

Synthesis of 5-trifluoromethyl-5,8-dideazafolic acid and 5-trifluoromethyl-5,8-dideazaisofolic acid

The target folate analogue 5-trifluoromethyl-5,8-dideazafolic acid has been elaborated in a seven-step reaction sequence beginning with 2-fluoro-6-trifluoromethylbenzonitrile. The bridge-reversed isomer 5-trifluoromethyl-5,8-dideazaisofolic acid was prepared in six steps using the common intermediate 2,6-diamino-3,4-dihydro-4-oxo-5-trifluoromethylquinazoline. The key intermediate 2-amino-3,4-dihydro-4-oxo-5-trifluoromethyl-quinazoline was prepared using two distinct synthetic routes and the resulting products were found to be identical.