疟疾防治药物的研究——ⅩⅤ.双-(2,4-二氨基喹唑啉-6-取代氨甲基)芳香类化合物的合成及其抗疟作用

A series of bis(2,4-diamino-quinazol-6-yl-substituted aminomethyl) aromatic derivatives were synthesized. Compounds Ⅱ_1～5 were synthesized by two ways. In the first, 2,4,6-triaminoquinazoline was condensed with the corresponding aryl dialdehydes to form Schiff bases which were reduced with sodium borohydride; the second used a new method in which 2,4,6-triaminoquinazoline was directly condensed with the corresponding aralkyl dihalides to afford the same products. The derivatives Ⅱ_6～16 were prepared by formylation, nitrosation or methylation respectively.The inhibition activities of the title compounds on dihydrofolate reductase in rat liver were assayed. The activities of formylated or nitrosated products were 6-9 times, and of methylated products were twofold as active as that of the parent compounds. Ⅱ₆, Ⅱ₉, Ⅱ₁₀ and Ⅱ₁₄ were nearly as potent as pyrimethamine. Primary antimalarial screening in mice showed that no one possessed significant activity.     

抗疟药的研究Ⅳ——2,4-二氨基-6-取代氨基磺酰喹唑啉的合成

2,4-Diamino-6-substituted amino sulfonyl quinazolines generally were prepared by refluxing 2,4-diamino-6-chloro-sulfonylquinazoline sulfate with suitable amines in dilute ethanol. For 2,4-diamino-6-(2-pyridy) amino sulfonyl quinazoline, it was prepared in dry pyridine. Compounds Ⅰ₂, Ⅰ₉ and Ⅰ₁₀ were shown to be more active against chloroquine resistant strain of P. berghei than sensitive strain. Compounds Ⅰ₂, Ⅰ₁₂ and Ⅰ₁₃ showed prophylactic action against P. yoelii.     

4-硝基二苯醚-4′-硫代氨基甲酰胺类化合物的合成及其抗日本血吸虫作用

Ten 4-nitrodiphenylether-4′-thiocarbamides were synthesized from 4-nitro-4′-thiocyanodiphenylether and corresponding amines. Preliminary screening data in table 1 showed that most of them exhibited insignificant or low activity against schistosoma japonicnm in mice, while V₉ with a diethyl substituted nitrogen in thiocarbamide structure was found to possess antischistosomal activity as high as that of nithiocyamine (Amoscanatec₉₃₃₃ GO/COP 4540).     

青蒿素类似物的研究 Ⅶ.双(二氢青蒿素)醚和双(二氢脱氧青蒿素)醚类化合物的合成

Some ethers, of bis(dihydroqinghaosu) Ⅲ and bis(dihydrodeoxyqinghaosu) Ⅳ were prepared in order to study the structure-activity relationships and to search for new antimalarials. Compounds Ⅲ were sythesized by condensation of glycol with two moles of dihydroqinghaosu using boron trifluoride etherate as catalyst. Compounds Ⅳ were prepared from ethers of bis (dihydroqinghaosu) by reduction with zinc and acetic acid.The bis-ethers were evaluated against chloroquine-resistant strain of plasmodium berghei in mice. Compounds Ⅲ were less potent than methyl-dihydroqinghaosu (Ⅰ) and compounds Ⅳ were inactive.     

二氢叶酸还原酶抑制剂:5-取代苯硫基(硒基)-2,4-二氨基嘧啶类化合物的合成和抑酶活性

According to the principle of isosterism the-CH₂-group of 5-(substituted benzyl)-2, 4-diaminopyrimidine was modified by—S—and—Se—and some 5-(substituted phenyl)thio-2, 4-diaminopyrimidines and 5-(substituted phenyl)seleno-2,4-diaminopyrimidines were synthesized. Their inhibitory activities on L. casei and chicken liver dihydrofolate reductase were determined. Preliminary data showed that the inhibitory activities of these compounds were less than those of the corresponding 5-(substituted benzyl)-2, 4-diaminopyrimidines. Their selectivities are also decreased.     

血吸虫病化学治疗的研究——ⅩⅩⅩⅣ.α-氯-β-(5-硝基-2-呋喃)丙烯酰胺类及其乙烯噁二唑类衍生物的合成

Synthesis of 35 new compounds of α-chloro-β-(5-nitro-2-furyl) acrylamides and 5-[α-chloro-β-(5-nitro-2-furyl ) vinyl]-oxadiazoles by known methods are reported. In preliminary test in mice 10 compounds were found to possess pronounced activity against Schistosomiasis japonica. Among these Ⅰ₁₂, Ⅰ₁₃, Ⅰ₁₄, Ⅰ₂₀, Ⅱ₁ and Ⅱ₈ were shown to be the most effective.     

抗心肌缺血药3-{4-[(2-羟基-3-烷氨基)丙氧基]苯基(苄基)}-取代4(3H)-喹唑酮的合成

In order to search for effective antimyocardial ischemic agents, fourteen new 3 4-[(3-alkylamino-2-hydroxy)propoxy] phenyl(benzyl)]-substituted 4(3H)-quin zolinones (Ⅱ) were synthesized. Substituted o-aminobenzoic acids used as the starting materials were allowed to react with acetic anhydride and then p-aminophenol (method A), or with N- (4- hydroxyphenyl)formamide (method B), or with thionyl chloride and then N - (4 - hydroxybenzyl) formamide (methode C) to form 3-[(4-hydroxyphenyl(benzyl)]-substituted 4(3H)-quinazolinones (Ⅲ). The intermediate Ⅲ reacted with epichiorohydrin to form the epoxides (Ⅳ). The reaction of Ⅳ with an excess of isopropylamine or tert-butylamine in boiling chloroform gave the desired products. Of all the compounds synthesized, Compounds Ⅱ_3～5 and Ⅱ₁₃ were found to increase the tolerance of mice to hypoxia. Further evaluation is in progress.     

对-氯苯丙炔酰胺类化合物的合成及其与肼反应产物的研究

Synthesis of p-chlorophenylpropiolylamides and itsreaction produets with hydrazine hydrate were studied. It was found that the reaction products varied with the different Substituent groups in the amidel When the substituent group was isopropyl or sec-butyl group, p-chloro-β-hydrazino-cinnamamides (Ⅱ) were obtained. Under similar reaction conditions, when the substituent, group was n-propyl, n-butyl or diethyl group, cyclization reaction occurred and the reaction product was 3-(p-chlorophenyl)-pyrazol-5-one (Ⅲ). All the compounds were tested in mice for anticonvulsant activity. Prelimary data showed that p-chlorophenyl-propiolyl-sec-butylamide (I₄) and p-chlorophenyl-propiolyl-n-propylamide (I₁) exhibited moderate anticonvulsant activity. The ED₅₀ was 54.5(34.4～86.4), and 56.1(31.6～99.6) mg/kg respectively. The compounds of p-chloro-β-hydrazino-cinnamamide (Ⅱ)and 3-(p-chlorophenyl)-pyrazol-5-one (Ⅲ) showed no significant effect on antieonvulsant activity. p-Chloro-cinnamoyl-hydrazide (Ⅳ) provided good anticonvulsant activity.     

抗高血压药物2-亚氨基-3-(β-羟基苯乙基)-噻唑烷衍生物的合成

2-Imino-3-(β-hydroxyphenethyl)thiazolidine showed hypotensive activity. In order to find more active derivatives, a series of compounds has been synthesized.In preliminary screening tests, Compounds (Ⅱ-2) and (Ⅳ-1) showed considerable hypotensive effect.     

双(2,6-哌嗪二酮)类抗肿瘤药物的研究:2,3-二乙酰氧基-1,4-二(3′,5′-二酮-N4′-取代哌嗪甲基)苯的合成

Seventeen compounds having the structure of 2,3-diacetoxy-1,4-bis(3′,5′- dioxo-N⁴′-substituted piperazinyl methyl)benzene were designed and synthesized based on chelation hypothesis. Their antitumor activities on P388 cells,Hep cells and SGC 7901 cells in vitro were tested. Preliminary results showed that compound 4e has potent antitumor effect against P388 cells and.Hep cells in vitro.     

抗疟药的研究——Ⅲ.2-(取代苯乙烯基)-4-氨基吡啶类的合成

本文报道2-(取代苯乙烯基)-4-(4′-二乙氨基-1′-甲基丁基氨基)-吡啶类的合成。动物筛选的初步结果表明:口服给药6.25mg/kg,化合物Ⅲ₂、Ⅲ₄和Ⅲ₇能完全抑制感染伯氏鼠疟原虫氯喹敏感株(Plalmodium berghei)小白鼠的原虫血症;皮下给药1.8mg/kg,化合物Ⅲ,即能达到完全抑制。     

疟疾防治药物的研究——Ⅹ.2,4-二氨基-6-N1,N2-二取代肼基-喹唑啉类衍生物的合成及其抗疟作用

本文报道了2,4-二氨基-6-N¹,N²-二取代肼基-喹唑啉类衍生物的合成及其抗疟活性的研究。这类化合物的合成是以2,4-二氨基6-取代苄基氨基-喹唑啉为原料经亚硝化、还原成为2,4-二氨基6-(N¹-取代苄基)—肼基喹唑啉,再与相应的醛缩合而成。此类化合物经伯氏鼠疟原虫抑制性治疗初筛表明有少数具有一定的效果。有11个化合物经约氏鼠疟原虫—斯氏按蚊系统病因性初筛有效。其中化合物Ⅱ_1,7,8,11,15和Ⅲ₁口服2.5mg/kg,连续3天,可使受试小鼠全部得到保护。     

抗疟药的研究——ⅩⅣ.三氟甲基喹啉四氢萘酚类及氨基酚类化合物的合成

前文报道2-特丁氨甲基-4-(7′-氯-4′-喹啉氨基)-5,6,7,8-四氢-1-萘酚盐酸盐对伯氏鼠疟原虫敏感株的作用较强,但对抗氯喹株有一定的抗性,在一些抗疟药中单边或双边取代的氨基苯酚侧链对抗疟作用也有一定的影响。Ohnmach等报道的甲氟喹,在其母核的2位和8位各为三氟甲基取代,与同类化合物相比,有较强的抗疟作用,并与氯喹无交叉抗药性,已在临床试用。因此,我们用三氟甲基代替喹啉核7位上的氯原子,并在喹啉核的4     

抗疟药的研究——ⅩⅥ.2,4-二氨基-6-[(取代苯基)硫代、亚硫酰、硫酰]喹唑啉类化合物的合成及抗疟作用

2,4-二氨基喹唑啉类化合物为叶酸拮抗剂,对多种动物疟原虫有较好的作用。Elsla-ger等报道2,4-二氨基-6-[(间-三氟甲苯基)硫代]喹唑啉(Ⅰ)对鸡疟(Plasmodiumgallinaceum)子孢子和鼠疟(Plrsmodium berghei)滋养体均有较好的杀灭作用,对乙胺嘧啶敏感的Oak Knoll株和抗乙胺嘧啶的马来亚Camp株感染的枭猴也有治愈作用。鉴于三氟甲基在抗疟药中的独特作用和喹唑啉亚硫酰、硫酰类化合物(Ⅱ)对鼠疟有较好作用的     

抗疟药的研究——α-(烷氨基甲基)-卤代-4-芴甲醇类化合物的合成

本文报道α-(烷氨基甲基)-7-溴-4-芴甲醇Ⅰ和α-(烷氨基甲基)-2,7-二氯-4-芴甲醇Ⅱ的合成。动物筛选的初步结果表明,这两类化合物均有一定的抗鼠疟作用。Ⅱ类化合物的抗疟作用比Ⅰ类化合物的强,Ⅱ类中的大多数化合物用25mg/kg的剂量即能抑制感染伯氏鼠疟原虫株(Plasmodium berghei berghei NK 65)小白鼠的原虫血症,其中Ⅱ_g,Ⅱ_h和Ⅱ_i用5mg/kg的剂量也能达到完全抑制。     

青蒿素类似物的研究 Ⅲ.二氢青蒿素二元酸双酯和单酯类衍生物的合成

青蒿素是新型化学结构的抗疟药。为了克服复燃率高及不溶解于水的缺点,我们以二氢青蒿素为原料与二元酸或酸酐和二环已基碳二亚胺(DCC)在4-二甲氨基吡啶(DMAP)催化下合成一系列的二氢青蒿素二元酸双酯及单酯类衍生物。经鼠疟(Plasmodium berghei)抗氯喹虫株筛选结果表明,化合物3的抗疟效果比青蒿素强9倍。     

疟疾防治药物的研究——Ⅶ.2,4-二哌啶(或吡咯啶)基-6-取代氨基喹唑啉衍生物的合成及其抗疟作用

本文报道2,4-二哌啶(或吡咯啶)基-6-取代氨基喹唑啉衍生物的合成及其抗疟作用。该类化合物经伯氏鼠疟原虫(Plasmodium berghei)抑制性治疗和约氏鼠疟原虫(P.yoelii)病因性预防筛选,发现有16个化合物对感染约氏鼠疟原虫的小鼠有病因性预防作用,其中以Ⅵ₁₁,Ⅷ₁,Ⅸ₂及Ⅸ₄四个化合物效果最好,每天口服2.5 mg/kg,连续三天,可使小鼠得到完全保护。此类化合物的合成,是以2,4-二氯-6-硝基喹唑啉与哌啶或吡咯啶缩合,经还原得2,4-二哌啶(或吡咯啶)基-6-氨基喹唑啉,然后与相应的取代苯甲醛缩合成席夫氏碱,再经还原和亚硝化而制得。     

疟疾防治药物的研究——ⅩⅢ.3-取代氨基喹唑酮-4衍生物的合成

Twenty-five compounds of N³-amino substituted quinazolone-4 have been synthesized and screened for activities against Plasmodium berghei and P yoelii in mice. No activity was found in these compounds.     

抗疟药的研究——Ⅸ.5-取代苯氧基-6-甲氧基-8-[(1-乙基-4-氨基丁基)氨基]喹啉类化合物的合成

至今,伯喹仍是唯一能应用的间日疟根治药,但由于毒性较大,化疗指数较低,在使用上受到一定的限制。近年来国内外对伯喹的化学结构进行了多方面的改造,出现了一些有希望的化合物。Chen等郑贤育等和许德余等分别报道在伯喹的5位引入取代苯氧基能提高抗疟作用,降低毒性;Yan等将4-甲基伯喹(Ia)的侧链1-甲基-4-氨基丁氨基改变成