3-取代-(1H)-嘧啶[1, 2-a]喹啉-1-酮和2-取代嘧啶[1, 2a]苯骈 咪唑-4-(10H)- 酮的简便合成法

本文利用2-氨基喹啉和2-氨基苯骈咪唑作为亲核试剂,与5-(双甲硫基亚甲基)丙二酸亚异丙酯(1)、5-(甲硫基亚烃基)丙二酸亚异丙酯(3)反应,开发出3-取代-(1H)-嘧啶-[1,2-a]喹啉-1-酮(5)和2-取代嘧啶[1,2-a]苯骈咪唑-4-(10H)-酮(6)通用的简便合成法。     

微波作用下3-取代-(1H)-嘧啶［1，2-a］喹啉-1-酮的一步合成法

5-(双甲硫基亚甲基 ) -2 ,2 -二甲基 -1 ,3 -二环己 -1 ,4-二酮 (1 ) [1] 既具有丙二酸亚异丙酯的环状结构 ,又具有乙烯基硫代缩酮的结构特征 .它是一种多功能的合成试剂 ,其最重要性质是可与多种亲核试剂发生加成反应 ,继而消除甲硫基 ,从而可以转变成一系列有用的合成中间体 (2 ) [2～ 5] .若亲核试剂具有两个亲核部位 Nu1及 Nu2 ,则 Nu1反应后 ,Nu2可进一步与丙二酸亚异丙酯的羰基进行分子内的亲核加成 ,从而形成环状化合物 (3 ) ,这一模式已在多种杂环化合物合成中获得应用[6～ 8] .Me SMe SOOMe OOMe　+ Nu1-Nu Me SNu1Nu …     

6-卤代咪唑并[1,2-a]吡嗪-3-甲酰胺的简便合成

6-卤代咪唑并[1,2-a]吡嗪-3-甲酰胺是一类重要的抗癌新药中间体,广泛应用于淋巴癌、肺癌、皮肤癌等癌症新药的研发。以2-氨基吡嗪为起始原料,与N-卤代丁二酰亚胺发生卤代反应,与N,N-二甲基甲酰胺二甲基缩醛制备亚胺化合物,再和溴乙酸乙酯缩合成环制备6-卤代咪唑并[1,2-a]吡嗪-3-甲酸乙酯,再与氨水氨解共4步反应合成6-卤代咪唑并[1,2-a]吡嗪-3-甲酰胺,总收率为50.7～54.2%。产物结构经IR、~1H NMR、~(13)C NMR、元素分析进行了表征。此合成路线具有原料易得、操作简单、成本低廉、产率较高、避免柱层析分离纯化、更适合工业化放大生产的特点。     

6-溴代呋喃[2,3-d]嘧啶双环核苷的合成新方法研究

6-溴代呋喃[2,3-d]嘧啶双环核苷是合成具有显著抗病毒活性的呋喃并嘧啶双环核苷衍生物的重要中间体.该类化合物的文献制备方法合成步骤多,并需使用钯配合物作催化剂.以易得的5-甲酰基嘧啶核苷为原料,先经与四溴化碳缩合得5-(2,2-二溴乙烯基)嘧啶核苷类似物,然后在碘化亚铜催化下发生环化反应生成目标产物,不仅缩短了合成路线,而且避免了贵金属试剂的使用,是一种经济实用的新方法.     

氨基磺酸催化下三组分一锅法无溶剂合成苯并[4,5]咪唑并[1,2-a]嘧啶类衍生物

无溶剂条件下,用氨基磺酸催化芳香醛,2-氨基苯并咪唑和β-二羰基化合物的三组分反应,简单而方便地得到了苯并[4,5]咪唑并[1,2-a]嘧啶类衍生物.该法具有产率高,成本低廉,环境友好,适应性广简捷方便等优点.     

微波作用下2-烃基-4-喹啉酮的简便合成法

在微波作用下5-(甲硫亚烃基)丙二酸亚异丙酯可与芳胺发生加成消除反应,首先生成5-(芳胺基亚烃基)丙二酸亚异丙酯,继而进一步闭环,提供了2-烃基-4-喹啉酮的快速合成法。     

2-(4''''-正丙基苯)咪唑并[2,1-α]异喹啉的晶体结构

本文测定了新型抗早孕药物 2-(4'-正丙基苯)咪唑并[2,1-a]异喹啉的晶体结构。该化合物分子式为C20H18N2, Mr = 286.38, 晶体属单斜晶系, 空间群为P21/n, 晶胞参数为a = 7.2177(1), b = 7.8036(2), c = 27.429(1) ? b = 90.976(3), V = 1544.67(8) 3, Z = 4, Dc = 1.231 g/cm3, F(000) = 608.00, m(Mo-Ka) = 0.073 mm-1, R = 0.0560, wR = 0.1440, 获得25986个衍射点,其中独立衍射点3795个。在分子结构中, 苯环(C(1)C(6))与环(N(1), C(1)C(9))以及咪唑环共平面, 该平面与苯环(C(12)C(17)所在平面的夹角为10.014。     

2-(4′-正丙基苯)咪唑并[2,1-a]异喹啉的晶体结构

本文测定了新型抗早孕药物2-(4′-正丙基苯)咪唑并[2,1-a]异喹啉的晶体结构.该化合物分子式为C20H18N2,Mr = 286.38,晶体属单斜晶系,空间群为P21/n,晶胞参数为a = 7.2177(1),b = 7.8036(2),c = 27.429(1) A,β＝ 90.976(3)°,V = 1544.67(8)A3,Z = 4,Dc = 1.231 g/cm3,F(000) = 608.00,μ(Mo-Kα)=0.073mm-1,R = 0.0560,wR = 0.1440,获得25986个衍射点,其中独立衍射点3795个.在分子结构中,苯环(C(1)-C(6))与环(N(1),C(1)-C(9))以及咪唑环共平面,该平面与苯环(C(12)-C(17)所在平面的夹角为10.014°.     

8-溴-6-甲基-2-(1-吡咯烷基羰基)咪唑并[1,2-a]吡啶的合成及晶体结构

以2-氨基-5-甲基吡啶为原料,经溴代、环合、水解及酰胺化反应合成了8-溴-6-甲基-2-(1-吡咯烷基羰基)咪唑并[1,2-a]吡啶,总收率32.82％,其结构经1H-NMR和MS确证,并用X-单晶衍射法测定了其晶体结构.结果表明:待测物块状晶体a(CCDC:2039002)属三斜晶系,空间群P-1,晶胞参数a=6....     

Cs2CO3催化下多组分一锅法合成螺吲哚-三唑并[1,5-a] 嘧啶及螺吲哚-苯并咪唑并[1,2-a]嘧啶类化合物

以3-氨基-1,2,4-三唑(或2-氨基苯并咪唑)、靛红和丙二腈为原料,经三组分一锅法合成了7种新型的螺吲哚-三唑并[1,5-a]嘧啶类化合物（1a~1g）和5种新型的螺吲哚 苯并咪唑并[1,2-a]嘧啶类化合物（2a, 2c, 2d, 2e, 2g）,其结构经¹H NMR, IR和HR-MS（ESI）表征。以1a和2a的合成为例,优化了合成反应条件。结果表明：在最优条件（Cs₂CO₃ 20 mol%, EtOH为溶剂,于80 ℃反应120 min）下,1a和2a收率分别为90%和87%。     

Syntheses of optically active tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones and hexahydroimidazo[1,2-a]pyridin-2(3H)-ones

The reactions of (2S)-2-amino-2-substituted-N-(4-nitrophenyl)acetamides 16a-c, succindialdehyde (13), and benzotriazole afforded enantiopure (3S,5R,7aR)-5-(1H-1,2,3-benzotriazol-1-yl)-3-substituted-1-(4-nitrophenyl)tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones 17a-c, which were converted by sodium borohydride into (3S,7aR)-3-substituted-1-(4-nitrophenyl)tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones 18a-c. Chiral (2S)-2-amino-2-substituted-N-(4-methylphenyl)acetamides 12a-d, easily prepared in two steps from N-Boc-alpha-amino acids 10a-d, similarly reacted with glutaraldehyde (20) and benzotriazole to generate 5-benzotriazolyl-3-substituted-hexahydroimidazo[1,2-a]pyridin-2(3H)-ones 21a-d, which were converted by sodium borohydride directly into optically active 3-substituted-hexahydroimidazo[1,2-a]pyridin-2(3H)-ones 22a-d.     

Synthesis of 7-substituted imidazo[1,2-a]pyrimidin-5(1H)-ones

The synthesis of 7-substituted imidazo[1,2-a]pyrimidin-5(1H)-ones by either of 2 methods is reported.     

Synthesis of some new imidazo[1,2-a]pyrimidin-5(1H)-ones as potential antineoplastic agents

Some substituted imidazo[1,2-a]pyrimidin-5(1H)-ones have been synthesized via the reaction of 2-aminoimidazole sulfate with some β-keto esters, diethyl ethoxymethylenemalonate and ethyl ethoxymethylenecyanoacetate. Several compounds were screened for their in vitro antineoplastic and anti-HIV activity but were inactive.     

A Three-Component Synthesis of trifluoromethylated hexahydropyrrolo[1,2-a]imidazol-5-ones and hexahydropyrrolo[1,2-a]pyrimidin-6-ones

Chemistry of Heterocyclic Compounds - A three-component reaction of ethyl trifluoropyruvate, methyl ketones, and ethylenediamine or 1,3-diaminopropane afforded...     

Synthesis of 3,5-Disubstituted-4,5-dihydroindeno[1,2-c] [1,2]diazepin-6(1H)-ones

3,5-Disubstituted 4,5-dihydroindeno[1,2-c][1,2]diazepin-6 (1H)-ones ( 3a–g ) were obtained in 29–72% yields by condensing 2-(substituted-2-acylethyl)-1,3-indandiones ( 1a–n ) with hydrazine. The NH group of the indenodiazepinones 3a–g is quite unreactive. Two methods based on the Michael reaction were used for preparing the acylethylindandiones 1a–n : one from 1,3-indandione and chalcone-type compounds and the other from 2-benzylidene-1,3-indandione and acetophenones. The latter method was found more practical and of more general application.     

Tetrahydro- and octahydropyrido[1,2-a]pyrimidin-4-ones

The catalytic hydrogenation of 2-methyl-, 1 2,8-dimethyl-, 2 , 2,9-dimethyl-, 3 , 9-methyl-2-propyl-, 4 , 2,3,9-trimethyl-, 5 , 9-methyl-2-phenyl-, 6 , 9-hydroxy-2-methyl-, 7 , 9-acetoxy-2-methyl, 8 , 9-carboxy-2-methyl-, 16 , 9-carboethoxy-2-methyl-, 17 , 9-carbomethoxy-2-methyl-, 18 , and several 9-carboxamido-2-methyl-, 19, 20 , and 21 , derivatives of the pyrido[1,2-a]pyrimidin-4-one heterocycle has led to a series of novel 6,7,8,9-tetrahydro- and fully saturated, octahydro analogs. In deuteriochloroform or DMSO-d₆ solution, the pmr spectra of the tetrahydro derivatives derived from 1-7 revealed only the 6,7,8,9-tetrahydro structures. In the pmr spectra of 16-21 , there was evidence of a facile 1,3-prototropic shift of the proton from position-9 to position-1, resulting in equilibria between tautomeric species, i.e., . The ratio of tautomers present at equilibrium, with the esters, favored the enamine conformation, whereas, with both the carboxylic acid and the amides, the imine structure predominated. Supportive evidence for the enamine structure with the esters was derived also from the ir spectra. Alkylation of the anion derived from the tetrahydro 9-carbomethoxy derivative with sodium hydride led exclusively to derivatives of 6,7,8,9-tetrahydro system.