嘧啶联吡唑甲酰胺类化合物的合成及除草活性

设计合成了一系列结构新颖的嘧啶联吡唑甲酰胺类化合物5a~5o,其结构均经过1H NM R和MS分析确证。初步生物活性测试结果表明:在有效成分150 g/hm2剂量下苗后茎叶喷雾处理时,化合物(R)-N-[1-(4-氯苯基)乙基]-3-二氟甲基-1-(4,6-二甲氧基嘧啶-2-基)-1H-吡唑-4-甲酰胺(5c)、N-[1-(4-氯苯基)乙基]-1-(4,6-二甲氧基嘧啶-2-基)-N-甲基-3-三氟甲基-1H-吡唑-4-甲酰胺(5i)和N-[1-(4-氯苯基)乙基]-1-(4,6-二甲氧基嘧啶-2-基)-3-三氟甲基-1H-吡唑-4-甲酰胺(5k)对繁缕Stellaria media的抑制率高达90%以上;而同样剂量下苗前土壤喷雾处理时,化合物N-[1-(4-氯苯基)乙基]-3-二氟甲基-1-(4,6-二甲氧基嘧啶-2-基)-1H-吡唑-4-甲酰胺(5b)和5c对繁缕的抑制率达100%。该类结构化合物有望作为除草先导化合物进行开发。     

新型5-[(3-甲基-5-(3,4)-二氯-1-苯基)]-吡唑基-(1,2,4)-三唑衍生物的设计合成研究

根据拼合原理,将1-氯芳基-(3,4)-二氯苯基引入吡唑环设计成新颖结构的1-氯芳基-(3,4)-二氯苯基-4-(1,2,4)-三唑基吡唑化合物,并研究其合成工艺。寻求制备具有杀菌活性的化合物5-{[(3-甲基-5-氯-1-(3,4)-二氯苯基)]-吡唑基]-(1,2,4)-三唑-[3,4]-1-硫-(3,4)-二氮-5-[(3,5)-二氯-4-甲基)]苯基-6-[(3-氟-4-硝基)苯基]}环己烷。以3-甲基-(3,4)-二氯苯基-5-氯-5-吡唑啉酮和三氯氧磷为起始原料,经过氯甲酰化、氧化、酯化、肼解、取代、环合、缩合、亲核加成反应制得目标化合物5-{[(3-甲基-5-氯-1-(3,4)-二氯苯基)-吡唑基]-(1,2,4)-三唑-[3,4]-1-硫-(3,4)-二氮-5-[(3,5)-二氯-4-(甲基)苯基]-6-[(3-氟-4-硝基)-苯基]}环己烷。在优化的条件下,目标化合物纯度为99.1%。该工艺简单经济,条件温和,合成工艺减少了溶剂的用量和废物排放量。     

新型含吡唑杂环邻氨基苯甲酰胺类化合物的合成与杀螨活性

以氯虫苯甲酰胺和氟虫腈的结构为基础,通过活性亚结构拼接的方法,设计合成了24个新型含吡唑杂环邻氨基苯甲酰胺类化合物,其结构经1H NM R、IR及APCI-M S表征。初步生物活性测试结果表明:化合物5-溴-N-[4-氯-2-甲基-6-(甲氨基甲酰基)苯基]-1-1-[2,6-二氯-4-(三氟甲基)苯基]-4-三氟甲基亚磺酰基-1H-吡唑-3-甲酰胺(5k)和5-溴-N-[4-溴-2-甲基-6-(甲氨基甲酰基)苯基]-1-[2,6-二氯-4-(三氟甲基)苯基]-4-三氟甲基亚磺酰基-1H-吡唑-3-甲酰胺(5l)在500 mg/L下对朱砂叶螨Tetranychus cinnabarinus的致死率为100%,但在100 mg/L下其致死率则分别降至30%和50%。所得结果可为邻氨基苯甲酰胺类化合物构效关系研究提供参考。     

N-甲氧基-N-[2-(3-三氟甲基-1-取代吡唑-5-氧甲基)]苯基氨基甲酸甲酯的合成及生物活性研究

为了寻找新的高效的Strobilurin类杀菌剂,以1-取代基-3-三氟甲基吡唑啉-5-酮与N-甲氧基-N-(2-溴甲基苯基)氨基甲酸甲酯反应,合成了系列新型N-甲氧基-N-[2-(3-三氟甲基-1-取代吡唑-5-氧甲基)]苯基氨基甲酸甲酯化合物(IV1～IV13),其结构经IR、1H NMR、LC/MS及元素分析确认.生物活性测定结果表明,该类化合物在50 mg/L下对稻瘟病菌Pyricularia oryzae、黄瓜灰霉病菌Botrytis cinerea、小麦白粉病病菌Erysiphe graminis等具有较高的抑菌活性,如IV13对稻瘟病菌P.oryzae 的抑制率达94.0%.     

新型1H-吡唑-5-甲酰基氨基脲类化合物的合成及生物活性

采用活性亚结构拼接和生物合理设计的方法,将4-氯-1-甲基-3-乙基-5-吡唑甲酰肼与取代苯基异氰酸酯反应得到14个新的含氨基脲的吡唑类化合物。其结构经IR、1H NMR、质谱和元素分析确证。初步生物活性实验结果表明, 化合物1-( 4-氯-3-乙基-1-甲基-1H-吡唑-5-甲酰基) -4-(2-甲基苯基)氨基脲( 4g) , 1-( 4-氯-3-乙基-1-甲基-1H-吡唑-5-甲酰基) -4-( 4-氯苯基)氨基脲( 4b)在500μg /mL 剂量下对小麦白粉病菌Bumeria graminis和粘虫Mythimna separata 的抑制率和致死率分别达到90%和100%。     

噁唑酰草胺及其代谢物在水稻上的残留

为探明噁唑酰草胺及其3个代谢物(N-(2-氟苯基)-2-(4-羟基苯氧基)-N-甲基丙酰胺(HPFMPA)、N-(2-氟苯基)-2-羟基-N-甲基丙酰胺(HFMPA)和6-氯-苯并噁唑酮(6-CBO))在水稻上的最终残留量,在我国10个主要水稻产区开展了噁唑酰草胺的田间残留试验.建立了糙米、稻壳和稻秆中噁唑酰草胺及其代...     

1-[(2-甲氧基-4-乙氧基)-苯基]-3-(3-(4-氧香豆素基)苯基)硫脲的合成

制备具有显著抗菌活性的1-[(2-甲氧基-4-乙氧基)苯基]-3-[(3-(4-氧香豆素)苯基]硫脲。以4-氯香豆素为原料,经过醚化、异硫氰酸化和缩合反应合成目标化合物1-[(2-甲氧基-4-乙氧基)-苯基]-3-(3-(4-氧香豆素基)苯基)硫脲。在优化的条件下,反应总收率为61. 63%,纯度为99%,其结构经1HNMR分析确认。该化合物具有优良的抗菌活性,该工艺简单经济,条件温和。     

放射性同位素碳-14标记氯虫苯甲酰胺的合成与分析

以[14C]碳酸钡为放射性同位素原料,通过格氏反应、亲核取代、胺化和缩合等8步放化反应制备了2种放射性同位素碳-14标记的氯虫苯甲酰胺粗品,经反相高效液相色谱(RPHPLC)纯化获得标记物纯品14C-氯虫苯甲酰胺[3-溴-N-[4-氯-2-甲基-6-(甲氨基[羰基-14C]甲酰基)苯基]-1-(3-氯-2-吡啶基)-1H-吡唑-5-甲酰胺(2,55.6 mCi)和3-溴-N-[4-氯-2-甲基-6-(甲氨基甲酰基)苯基]-1-(3-氯-2-吡啶基)-1H-吡唑-5-[羰基-14C]甲酰胺(3,58.6 mCi)]。以[14C]碳酸钡计,两种标记物的总放化收率分别为32%和52%。其结构经核磁共振氢谱、质谱和在线放射性高效液相色谱(HPLC-FSA)分析确认。放射性薄层成像分析(TLC-IIA)、离线放射性高效液相色谱分析(HPLC-LSC)、在线放射性高效液相色谱-二极管阵列检测器/质谱联用(HPLCFSA/PDA/MS)和LSC分析表明,两种14C-氯虫苯甲酰胺的放化纯度分别为99.8%和99.6%,化学纯度分别为99.1%和98.4%,比活度分别为52.45 mCi/mmol和52.30 mCi/mmol。这2种标记物可作为放射性示踪剂,可满足氯虫苯甲酰胺在中国的登记代谢试验研究的需要。     

唑啉草酯

理化性质：唑啉草酯属新苯基吡唑啉类化合物。化学名称：8-（2，6-二乙基-4-甲基苯基）-1，2，4，5-四氢-7-氧v7H-吡唑[1，2-d][1，4，5]氧二氮卓-9-基2，2-二甲基丙酸酯；     

3-溴-1-(3-氯-2-吡啶基)-1H-吡唑-5-甲酸的合成工艺研究

旨在优化合成氯虫苯甲酰胺的重要中间体3-溴-1-(3-氯-2-吡啶基)-1H-吡唑-5甲酸,并寻找一条适用于工业化生产的工艺路线。以2,3-二氯吡啶为原料,首先经过肼解反应,生成3-氯-2-肼基吡啶,然后3-氯-2-肼基吡啶经过环合,得到2-(3-氯吡啶-2-基)-5-羟基吡唑-3-甲酸乙酯,2-(3-氯吡啶-2-基)-5-羟基吡唑-3-甲酸乙酯经过溴化,得到3-溴-1-(3-氯吡啶-2-基)4,5-二氢-1H-吡唑-5-甲酸乙酯,再氧化3-溴-1-(3-氯吡啶-2-基)4,5-二氢-1H-吡唑-5-甲酸乙酯,生成3-溴-1-(3-氯吡啶-2-基)-1H-吡唑-5-甲酸乙酯,最后3-溴-1-(3-氯吡啶-2-基)-1H-吡唑-5-甲酸乙酯水解,得到目标中间体3-溴-1-(3-氯-2-吡啶基)-1H-吡唑-5甲酸。在优化的条件下,反应总收率为44.44%,纯度为99.2%,所有中间体及产物经过1H NMR、IR进行表征。该路线条件温和、操作简便,为工业化生产奠定了基础。     

3-[2-(4-氯-苯基)-1-(3,3-二甲基-氧代-丁基)-乙烯基]-2-氰基亚胺-1,3-噻唑的合成研究

本文研究了3-[2-(4-氯-苯基)-1-(3,3-二甲基-氧代-丁基)-乙烯基]-2-氰基亚胺-1,3-噻唑的合成方法,对反应的各个步骤中的投料摩尔比、溶剂、温度和催化剂进行了对比,优化了反应步骤,总结出了产率较高的合成路径。设计合成了未见报道的新型噻唑衍生物类化合物。其结构经红外光谱、氢核磁共振和气质联用谱图确认,总收率为37.3%。该合成技术降低了成本,减轻了对环境的污染,具有很好的发展前景和市场竞争力。     

A stereoselective versatile synthesis of 3-(2,2- dihalovinyl)-2,2-dimethylcyclopropanecarboxylic acids

A straightforward high-yield synthesis of cis-3-(2,2-dihalovinyl)-2,2-dimethylcyclo-propanecarboxylic acids is described which uses only inexpensive starting materials and reagents. The synthesis of these acids, involving a [2+2]-cyclo-addition of halogenated ketenes with 2-methylpropene and two rearrangements (the ?cine’? and the Favorskii rearrangements) as the key steps, exemplifies the conceptually new synthesis.     

The synthesis of 3-(2,2-Dichlorovinyl)-1- methylcyclopropane-1,2-dicarboxylic acid

3-(2,2-Dichlorovinyl)-1-methylcyclopropane-1,2-dicarboxylic acid, a metabolite of the pyrethroid insecticide permethrin, has been synthesised as a mixture of isomers, in four stages, in high overall yield.     

Stereochemical and chiral aspects in the synthesis of 3-(2,2- dihalovinyl)-2,2-dimethylcyclopropanecarboxylic acids

The synthesis of (1RS)-cis,trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid by dehydrohalogenation of 4,6,6,6-tetrahalohexanoates has been modified to produce stereo-selectively the cis-isomer. A new stereospecific synthesis of cis-3-(2,2-dihalovinyl)-2,2-dimethylcyclopropanecarboxylic acids using a bicyclic lactone and its extension to the preparation of the optically active (1R)-cis acid are described.     

普通小麦-华山新麦草易位系H9020-1-6-8-3抗条锈病基因的遗传分析和SSR标记

 It have proved that wheat translocation line H9020-1-6-8-3 derived from Psathyrostachys huashanica Keng is an important resistant resource to stripe rust.To confirm the existence of resistant genes,it was crossed with susceptible cultivar MingXian 169 as male and female parent,respectively.Seedlings of parents and F₂ progeny were tested for resistance to selected CY29 of races of Puccinia striiformis f.sp.tritici from China.H9020-1-6-8-3 had one dominant resistant gene which temporarily named YrHs,whatever it was male or female parent.By using BSA method,two markers,Xgwm261 and Xgwm455 located on 2DL were found.The distance to YrHs were 4.3 and 5.8 cM respectively.The result could be used in molecular-assisted breeding.     

Photochemical behaviour of dichlorprop [(+/-)-2-(2,4-dichlorophenoxy)propanoic acid] in aqueous solution

Aqueous solutions of dichlorprop were irradiated under different conditions of pH, wavelength and oxygenation. The photochemical behaviour was found to be complex and many photoproducts were formed. However, at low concentrations the main photoproducts were 4-chloropyrocatechol, 2-chlorophenol, 4-chlorophenol and 2,4-dichlorophenol. Some other photoproducts were identified, namely 2-(4-chloro-2-hydroxyphenoxy)propanoic acid, 2-(3,5-dichloro-2-hydroxyphenyl)propanoic acid and 2,4-dichlorophenyl acetate. From comparison with results previously obtained with mecoprop [2-(4-chloro-2-methylphenoxy)propanoic acid] it appears that the presence of a chlorine atom in position 2 on the ring strongly modifies the photochemical behaviour.     

2-氰基-3-[(6-氯)-3-吡啶甲基]氨基-3-脂肪氨基丙烯酸乙酯的合成

以3-氨甲基吡啶和2-氯-5-氨甲基吡啶为原料先与2-氰基-3,3-二甲硫基丙烯酸乙酯反应得到中间体2a和2b,不经分离,直接与脂肪胺反应,合成了7个未见文献报道的开环类吡虫啉结构化合物3.所有目标化合物(包括2a和2b)均经元素分析和1H NMR确证,并对其构型进行了讨论.     

2-(1,5-亚戊基)-5-取代亚氨基-Δ3-1,3,4-噻二唑啉的合成及杀菌活性

为考察脂肪环的大小对噻二唑啉衍生物杀菌活性的影响,以环己酮为原料,先与取代缩氨基硫脲缩合,得N-取代环己酮缩氨基硫脲,再经二氧化锰氧化关环,得到9个未见文献报道的标题化合物,所有化合物的结构均经过IR、13C NMR和元素分析确证。初步杀菌实验结果表明,所有目标化合物在100 mg/L和50 mg/L浓度下,对棉花立枯病菌Rhizoctonia solani Kühn和棉花枯萎病菌Veticillium dahlide具有一定的杀菌活性,特别是对棉花立枯病菌,在50 mg/L下有5个化合物的抑制率达90％以上。     

2-氰基-3- 氨基-3-脂肪氨基丙烯酸乙酯的合成

以3-氨甲基吡啶和2-氯-5-氨甲基吡啶为原料先与2-氰基-3,3-二甲硫基丙烯酸乙酯反应得到中间体 2a和2b, 不经分离,直接与脂肪胺反应,合成了7个未见文献报道的开环类吡虫啉结构化合物 3 。所有目标化合物(包括 2a和2b )均经元素分析和1H NMR确证,并对其构型进行了讨论。     

Effects of ametryn [2-(ethylamino)-4-(isopropylamino)-6-(methylthio)-s-triazine] on nitrate reductase activity and nitrite content of wheat (Triticum aestivum L.)

The objectives of this study were to show that: (a) a herbicide, such as ametryn, which interferes with the photosynthetic electron transport system, causes nitrite to accumulate in illuminated leaves and (b) that nitrite is toxic and contributes to the herbicidal damage and death of the plant. Tests were conducted on wheat seedlings grown on 5 mM nitrate, 5 mM ammonia, and zero nitrogen. Ametryn treatment decreased in vivo and in vitro nitrate reductase activity (NRA) within a 26-hr period. In vivo NRA decreased more rapidly than in vitro NRA. Compared with control tissue, only 3% in vivo NRA remained at the end of 26 hr. The in vivo assay conducted in light confirmed the inhibition of photosynthetic electron flow by ametryn within the leaf tissue. Nitrate-grown, ametryn-treated plants accumulated nitrite and, after 10 days were the only plants that were completely desiccated and dead. Ammonia- and zero-nitrogen, ametryn-treated plants did not accumulate nitrite, were only partially chlorotic after the 10-day period, and were still living. Low levels of NO_(X) (NO₂ and/or NO) emissions were demonstrated by nitrate-grown ametryn-treated plants.