3—芳酰基乙基斯德酮在浓盐酸中的分离反应

3－芳酰基乙基斯德酮与过量浓盐酸在乙酸酯中于室温下反应，生成3－芳酰基乙基斯德酮的盐酸盐，而将3－芳酰基乙基乙基斯德酮与不同量的盐酸在乙酸乙酯中回流，则得到1－芳酰基乙基－3－芳基吡唑啉，此外，33－芳酰基乙基－4－溴斯德酮在类似条件下分解得到的相应的1－氯甲酰吡唑啉。     

（3—苄基—4—芳酰基—1,2,4—三唑—5—基）（5—苯基—1,3,4—E…

通过３－苄基－４－芳酰基－１，２，４－三唑－５－巯基负离子在２－甲磺酰基－５－苯基－１，３，４－Ｅ二唑环２－位上的亲核取代反应，制得１３个新的（３－苄基－４－芳酰基－１，２，４－三唑－５－基）（５－苯基－１，３，４－Ｅ二唑－２－基）硫醚衍生物。经元素分析、ＩＲ、＾１Ｈ ＮＭＲ和ＭＳ裂解碎片分析确认结构。初步观察了它们在０．０１％浓度时对大肠杆菌繁殖的抑制作用。     

2—（芳磺酰基）—1—（2—噻吩基）乙酮的合成

２－（芳磺酰基）－１－（２－噻吩基）乙酮的合成丁言斌樊爱龙张正＊（南京大学化学系南京２１００９３）关键词氯噻吩基乙酮，芳磺酰基噻吩基乙酮，合成，相转移催化１９９６－０８－１２收稿，１９９７－０１－１３修回砜类化合物不仅是有机合成的有用中间体［１］，而...     

2—芳甲酰氨基硫羰基—3—异噻唑酮及4—氰基—5—甲硫基—2—芳甲…

通过３－羟基异噻唑和４－氰基－５－甲硫基－３－羟基异噻唑（５）分别与芳酰基异硫氰酰酯（３）反应,合成标题化合物２－芳甲酰氨基硫羟基－３－异噻唑酮和４－氰基－５－甲硫基－２－芳甲酰氨基硫羟基－３－异噻唑酮,对此反应及产物的结构特点进行了探讨。     

1—芳酰基—4—（1‘—N—β—D—吡喃型糖基）氨基硫脲类化合物的合成

通过２,３,４,６－甲－Ｏ－乙酰基－β－Ｄ－吡喃型葡萄糖异硫氰酸酯和２,３,４－三－Ｏ－乙酰基－β－Ｄ－吡喃型木糖异硫氰酸酯与取代的芳基酰肼和亲核加成反应合成了１０个１－芳酰基－４－（１’－Ｎ－２’,３’,４’,６’－四－Ｏ－乙酰基－β－Ｄ－吡喃型葡萄糖基）氨基硫脲和７个１－芳酰基－４－（１’－Ｎ－２’,３’,４’－三－Ｏ－乙酰基－β－Ｄ－吡喃型木糖基）氨基硫脲,所得化合物的结构经元素分析,ＩＲ,     

N,N‘—二（芳磺酰）亚磺酰胺—S—（2—苯并咪唑）钠作为稳定的研究

研究了新型感光稳定剂Ｎ，Ｎ’－二（芳磺酰）亚磺酰胺－Ｓ－（２－苯并咪唑）钠（芳磺酰基为苯磺酰，对甲苯磺酰，对氯苯磺酰）与增感染料在实用照相乳剂虽的超增感与防雾作用。     

N—（1—氧代—1—磷杂—2,6,7—三氧杂双环[2.2.2]—辛烷—4—羰…

首次合成了酰基异硫氰酸酯４，并将其与各种芳胺、脂肪胺和肼衍生物加成，得到了２２种未见文献报道的含双环笼状磷酸酯结构的酰基硫脲化合物（５ａ－５ｘ）。４与丁胺反应未得到预期的加成产物，而得到相应的取代产物６。研究了５的结构。     

四氢叶酸辅酶模型化合物的研究：I.碘化1,2—二甲基—3—芳磺酰基—△^2 …

合成了四氢叶酸辅酶甲酸态的３个模型化合物,即碘化１,２－二甲基－３芳磺酰基（芳基＝ｐ－ＣＨ３Ｃ６Ｈ４,Ｃ６Ｈ５,ｐ－ＣｌＣ６Ｈ４）－△＾２－咪唑啉,研究了其还原和水解反应。     

1-芳磺酰基-3-N-(β-D-乙酰基吡喃半乳糖-1-基)-5-氟脲嘧啶的合成和表征

在相转移催化条件下,２,３,４,６－四－Ｏ－乙酰基－１－溴－１－脱氧α－Ｄ－吡喃半乳糖与１－芳磺酰基－５－氟脲嘧啶反应合成了７个新的１－芳磺酰基－３－Ｎ－（β－Ｄ－乙酰基吡喃半乳糖－１－基）－５氟脲嘧啶类化合物,其结构经元素分析,ＩＲ及＾１ＨＮＭＲ证实。     

N，N＇－硫代磷酰基芳酰胺基硫脲的合成及生物活性

Ｎ，Ｎ＇－硫代磷酰基芳酰胺基硫脲的合成及生物活性金桂玉，解敏雨，赵国锋（南开大学元素有机化学研究所天津３０００７１）关键词芳酰肼，硫代磷酰基异硫氰酸酯，硫代磷酰基芳酰胺基硫脲，合成，生物活性含（硫代）磷酰基的硫脲衍生物具有广泛生物活性，如杀虫［１，２...     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.