超声辐射下一步法合成2-氨基-3-氰基-4-芳基-7，7-二甲基-5-氧代-5，6，7，8-四氢-4H-苯并[b]吡喃

芳醛、丙二腈和5，5-二甲基-1，3-环己二酮在乙二醇中不加任何催化剂经超 声辐射5-7min得2-氨基-3-氰基-4-芳基-7，7-二甲基-5-氧代-4H-5，6，7，8-四氢 苯并[b]吡喃，产率88％—96％．     

顺（反）-2，4，7-三芳基5-氧代4H-5，6，7，8-四氢苯并吡喃衍生物的合成

在酸或碱怀条件下，5，5-二甲基-1，3-环已二酮和5-芳基-1，3-环已二酮与 查尔酮首先进行Michael加成反应，进而环合为7，7-二甲基-2，4-二芳基-5-氧代- 4H-5，6，7，8-四氢苯并吡喃衍生物和含有两个手性原子的顺和反-2，4，7-三芳 基-5-氧代-4H-5，6，7，8-四氢苯并吡喃衍生物。讨论了反应机理并且通过~1H NMR光谱和NOE差谱确定其产物构型。所合成新的多氢苯并吡喃衍生物的分子结构 均经红外光谱、核磁共振光谱和元素分析予以证实。     

水中3-甲基-6-氨基-5-氰基-4-芳基-1-苯基-1，4-二氢吡喃[2，3-c]吡唑的洁净合成

在水溶剂中并有三乙基苄基氯化铵（TEBA）存在下，取代芳亚甲基丙二腈与3- 甲基-1-苯基-2-吡唑啉-5-酮缩合成为3-甲基-6-氨基-5-氰基-4-芳基-1-苯基-1， 4-二氢吡喃[2,3-c]吡唑，此法为相应化合物的合成提供了一种快速、方便、高效 和洁净的方法。     

4-甲基-7，10-二氢苯并[h]香豆素的合成研究

以1-萘酚(6)为起始原料，经过Birch还原得到5，8-二氢-1-萘酚(7)；7与乙酰 乙酸乙酯在不同条件下缩合合成了4-甲基-7，10-二氢苯并[h]香豆素(4)．研究结 果表明，无氧和酸催化的反应条件对缩合反应是至关重要的．在没有酸催化的条件 下，反应生成3-乙酰基-2-羟基-6-甲基-吡喃-4-酮(8)，并通过单晶X射线衍射分析 确定了产物的结构；在酸催化的条件下，除了生成产物4外，还伴随生成脱氢芳构 化产物4-甲基苯并[h]香豆素(5)，而且在不同条件下二者的比例不同，其中以甲磺 酸为催化剂、在氮气保护下并加入抗氧化剂无水Na_2SO_3为最佳反应条件，化学选 择性约为70：30(4：5)，收率49．1％．     

5，3’，4’—三羟基—6，7—二甲氧基黄酮的另法全合成

从两个易得原料3，4，5—三甲氧基苯甲酸和3，4-二羟基苯甲醛出发，分别合 成出2—羟基4，5，6—三甲氧基苯乙酮和3，4-二苄氧基苯甲酰氯，随后采用相转 移催化法成功地全合成了5，3’，4’—三羟基—6，7—二甲氧基黄酮。     

2-[2-(4, 6-二甲基)-嘧啶基]-4-苯基-1, 2, 4-恶二唑烷-3, 5-二酮的合成

异氰酸苯酯和N-[2-(4, 6-二甲基)-嘧啶基]-羟胺(5)反应生成1-[2-(4, 6-二甲基)-嘧啶基]-1-羟基-3-苯基脲(6)。化合物(6)在三乙胺存在下和氯甲酸乙酯反应生成2-[2-(4, 6-二甲基)-嘧啶基]-4-苯基-1, 2, 4-恶二唑烷-3, 5-二酮(1)。     

无外加催化剂条件下2-氨基-3-腈基-4-芳基-7,7-二甲基-5-氧 代-4H-5,6,7,8- 四氢苯并-[b]-吡喃-3-羧酸乙酯的合成

亚苄基氰基乙酸乙酯(1)与5,5-二甲基-1,3-环已二酮在乙二醇中不加任何催化剂于80℃反应2～3h得2-氨基-4-芳基-7,7-二甲基-5-氧化-4H-5,6,7,8-四氢苯并-[b]-吡喃-3-羧酸乙酯(3),产率75%～93%。     

3-(D-葡萄糖-1-基)-6-芳基-7H-1，2，4-三唑并[3，4-b][1，3，4]噻二嗪类化合物的合成及波谱研究

ω-溴代芳香基乙酮与3-(D-葡萄糖-1-基)-4-氨基-5-巯基-1，2，4-三唑反应 合成了一系列新颖的3-(D-葡萄糖-1-基)-6-芳基-7H-1，2，4三唑并[3，4-b[1，3 ，4]噻二嗪．用元素分析，IR，NMR，MS对其结构进行了表征，研究了其NMR波谱特 征，并以^1H-^1H COSY，^13C-^1H COSY，COLOC二维NMR技术对其^1H NMR，^13C NMR的谱峰进行了全归属     

2-羟基-5-甲基-5-(4-甲基戊烯-3-)基四氢呋喃的合成

本文研究了一类羰基化合物-酮类为原始料(选用了来源丰富, 价格低廉的6-甲基-5-庚烯酮-2), 经格氏反应水解, 环化及醚化即合成了2-羟基-5-(4-甲基戊烯-3-)基四氢呋喃。     

水中α,β-不饱和酮与3-甲基-1-苯基-2-吡唑啉-5-酮的加成反应

在水溶剂中有三乙基苄基氯化铵（TEBA）存在下，α,β-不饱和酮与3-甲基- 1-苯基-2-吡唑啉-5-酮发生迈克尔加成反应，以良好的产率生成相应的1,3-二芳基 -3-（3'-甲基-1'-苯基-5'-羟基-2'-吡唑啉-4'-基）-1-丙酮。     

Synthesis of 3-amino-4-nitropyrazoles

3-Bromo-1,5-dimethyl-4-nitropyrazole does not react upon heating with aqueous ammonia, while 1,5-dimethyl-3,4-dinitropyrazole under the same conditions yields 3-amino-1,5-dimethyl-4-nitropyrazole, which is formed from 3-bromo-1,5-dimethyl-4-nitropyrazole in the presence of a copper catalyst. The amination of 1-methyl-3,4-dinitropyrazole-5-carboxylic acid is accompanied by decarboxylation, which is characteristic for 4-substituted 1-methylpyrazole-5-carboxylic acids upon heating in aqueous ammonia or water.     

Synthesis of 4-acyl-and 235 4-alkenyl-3,5-dimethylisothiazole derivatives

4-Acyl- and 4-alkenyl-3,5-dimethylisothiazole derivatives, not available by direct electrophilic substitution [1–5] have been prepared from 3,5-dimethyl-4-isothiazolylcarbonitrile 1 and the corresponding aldehyde 2 in satisfactory yields. Both compounds, 1 and 2 , are readily obtained from 3,5-dimethyl-4-iodoisothiazole, whose preparation we have previously reported [6].     

1,2,5-Trimethyl-4-aminopiperidine and 3, 6-dimethyl-4-phenyl-2-aminopyridine

1,2,5-Trimethylpiperid-4-one is used to prepare 1, 2, 5-trimethyl-4-aminopiperidine, which is then converted to 1, 2, 5-trimethyl-4-(diethylaminoacetylamino)piperidine. Amination of 2, 5-dimethyl-4-phenylpyridine is effected, and 3, 6-dimethyl-4-phenyl-2-aminopyridine is thereby obtained.     

Substituted pyridines. 2, 5-dimethyl-4-styryl- and -4-phenylethy-nylpyridines

2, 5-Dimethyl-4-styrylpyridine and 2,5-dimethyl-4-phenylethynylpyridine are prepared from 2, 5-dimethyl-4-β-phenylethylpyridine. Hydration of the second of these compounds gives gw-(2,5-dimethylpyridyl-4)acetophenone.     

Synthesis of 2,5-dimethyl- and 1,2,5-trimethyl-4-dimethoxyphosphinylpiperid-4-ols

Dimethyl phosphite is condensed with 2,5-dimethyl- and 1,2,5-trimethylpiperid-4-ones in the presence of alkali metal alkoxides. It is shown that 2,5-dimethyl- and 1,2,5-trimethyl-4-dimethoxyphosphinyl-piperid-4-ols are formed in both cases in the same stereoisomeric forms and in high yields. Methylation of the piperidol isomer which was not substituted at the nitrogen atom indicated that the two piperidols formed had the same configuration.     

Synthesis of 4H-pyrazolo- and 4H-pyrrolophenothiazin-4-one derivatives

5-Methyl- and 6-methyl-2-phenyl-2H-indazole-4,7-diones were condensed with 2-aminobenzenethiol or 6-substituted-3-aminopyridine-2(1H)thiones 4 to produce a new type of 5-methyl-2-phenyl-4H-pyrazolophenothiazin-4-ones or 8-substituted-7-aza-5-methyl-2-phenyl-4H-pyrazolophenothiazin-4-one derivatives. From 6-bromo-2,5-dimethyl-1,3-diphenyl-2H-isoindole-4,7-dione and 4 8-substituted-7-aza-2,5-dimethyl-1,3-diphenyl-4H-pyrrolophenothiazin-4-one derivatives were also prepared.     

Synthesis and Bioactivity of Novel Aminomethyl-2-（1, 2,4-triazol）-4, 4-dimethyl-3-pentanone （ol）

3, 3-Dimethyl-1-(1,2,4-triazol)-2-butanone was treated with aqueous formaldehyde to give an additional product, and subsequent elimination by acetic anhydride yielded 4,4-dimethyl-2-(1,2,4-triazol)-1-penten-3-one. Further addition with substituted amines provideda series of (1,2,4-triazol)-4,4-dimethyl-3-pentanone, which were then reduced by KBH4 to obtaina series of (1,2,4-triazol)-4,4-dimethyl-3-pentanol. Their structures were confirmed by ^1HNMR and elemental analysis. The results of bioassay showed that the title products possess good fungicidal activities.     

1- and 2-(4-Hydroxycarbonylphenyl)-4-oxo-4,5,6,7-tetrahydroindazoles

Reactions of 4-hydrazinobenzoic acid with 2-formyl- and 2-acetyldimedones were utilized to synthesize 6,6-dimethyl- and 3,6,6-trimethyl-1-(4-hydroxycarbonylphenyl)-4-oxo-4,5,6,7-tetrahydroindazoles corre-spondingly, and the reaction with 2-cyano-3-ethoxy-5,5-dimethylcyclohex-2-en-1-one gave 2-(4-hydroxy-carbonylphenyl)-3-amino-4-oxo-6,6-dimethyl-4,5,6,7-tetrahydroindazole. Riga Technical University, Riga LV-1658. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 516–519, April, 1997.     

Reactions of 4-amino-1,3,5-dithiazine with ammonia and amines

It is shown that selective replacement of the sulfur atom in the 3 position by a nitrogen atom, which leads to 2,6-dimethyl-4-amino-3H-2,6-dihydro-1,3,5-thiadiazine, occurs when 2H,6H-2,6-dimethyl-4-amino-1,3,5-dithiazine is treated with ammonium hydroxide. Under the same conditions, amines cause profound destruction of 2H,6H-2,6-dimethyl-4-amino-1,3,5-dithiazine with the production of thiourea.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 652–655, May, 1982.     

3,6,6-trimethyl-4-oxo-1-(2-pyridyl)-4,5,6,7-tetrahydroindazole in Schmidt reaction and Beckmann rearrangement conditions for the 4-hydroxyimino derivative

Treatment of 3,6,6-trimethyl-4-oxo-1-(2-pyridyl)-4,5,6,7-tetrahydroindazole with sodium azide in acids gives 3,7,7-trimethyl-5-oxo-1-(2-pyridyl)-5,6,7,8-tetrahydro(4H)pyrazolo[4,3-b]azepine. Heating 1-(2-pyridyl)-3,6,6-trimethyl- and 1-phenyl-6,6-dimethyl-4-hydroxyimino-4,5,6,7-tetrahydroindazoles in polyphosphoric acid gives 1-phenyl-5,6-dimethyl- and 1-(2-pyridyl)-3,5,6-trimethyl-4-aminoindazole respectively: The reactions of the latter with 4-dimethylaminobenzaldehyde gave the 4-(4-dimethylaminobenzalamino) derivative and with 2-formyldimedone the 4-(4,4-dimethyl-2,6-dioxocyclohexylidenemethylamino) derivative.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 830–834, June, 2000.