L-酒石酸正己酯的合成

以甲苯作溶剂,对甲苯磺酸作催化剂,L-酒石酸、正己醇为原料合成了手性选择体——L-酒石酸正己酯。确定最隹反应条件为：L-酒石酸100mmol,n(L-酒石酸)：n(正己醇)=1：2．8,甲苯45mL,对甲苯磺酸0．30g,回流反应．53min,酯化率在99％以上,收率达83％。     

N-三甲基硅基对甲苯磺酰胺与对甲苯磺酸酯的反应

报道了3-氧杂-1,5-二戊醇二对甲苯磺酸酯及1,4-丁二醇二对甲苯磺酸酯与N-三甲基硅基对甲苯磺酰胺在碱存在下反应分别得到N-对甲苯磺酰基吗啡啉和N-对甲苯磺酰基四氢吡咯这一新的有机硅胺与磺酸酯的反应,在相同条件下N-三甲基硅基-对甲苯磺酰胺与对甲苯磺酸甲酯反应后仅得到N-甲基对甲苯磺酰胺,对此反应提出了可能的反应途径。     

2,2'－联吡啶桥连的双－4,4'-联吡啶哑铃型化合物的合成

二甘醇2与对甲苯磺酰氯在CH_2Cl_2中，0 ℃～r.t.及Et_3N存在下反应得2－ （羟乙氧基）乙醇对甲苯磺酸酯（3），收率88％。化合物3与对叔丁基苯甲酰氯在 CH_2Cl_2中0～5 ℃及吡啶存在下反应得2－（对叔丁基苯甲酰氧基乙氧基）乙醇对 甲苯磺酸酯（4），收率96％。4与对羟苯甲醇在乙腈中及CsF/K_2CO_3存在下70 ℃ 反应得2－（对叔丁基苯甲酰氧基乙氧基）乙氧苄醇（5），收率98％。5与NBS及 PPh_3在THF中，室温下反应得化合物2－（对 丁基苯甲酰氧基乙氧基）乙氧苄溴 （6），收率95％。6与4,4'－联吡啶在乙腈中，60 ℃反应1h得N－[2－（对叔丁基 苯甲酰氧基乙氧基）乙氧苄基]－4,4'－联吡啶六氟磷酸盐（7），收率85％。7与 α,α－二（溴甲基）－2,2'－联吡啶在乙腈中，油浴60 ℃反应36h，得到标题化 合物，产率为45％。     

N-[4-(磺酰胺)苯基](甲基)丙烯酰胺的合成

以对氨基苯磺酰胺、丙烯酰氯(或甲基丙烯酰氯)为原料合成了N-[4-(磺酰胺)苯基]丙烯酰胺(ASPAA)和N-[4-(磺酰胺)苯基]甲基丙烯酰胺(ASPMAA),其结构经^1H NMR,IR和元素分析表征。合成ASPAA的最佳条件：对氨基苯磺酰胺13．76g(80mmol),n(对氨基苯磺酰胺)：n(丙烯酰氯)=1．0：1．1,n(丙烯酰氯)：n(NaHCO3)：1．00：1．14,0℃～2℃反应3h,反应液倾入10倍体积的的甲醇-水[V(甲醇)：V(水)=1：10]中析出产物,收率在60％以上。合成ASPMAA的最佳条件：对氨基苯磺酰胺6．88g(40mmol),n(对氨基苯磺酰胺)：n(甲基丙烯酰氯)=1.00：1．05,n(三己胺)：n(甲基丙烯酰氯)：1．0：1．0,在0℃～2℃滴加甲基丙烯酰氯后先在室温下反应1h,然后在60℃反应1h,反应液倾入700mL石油醚中析出产物,收率50％～60％．     

l—对甲苯磺酰乳酸乙酯合成中产率分析方法的研究

报道了实验室可行、工业生产实用的l－对甲苯磺酸乳酸乙酯产率的分析方法,采用K2CrO4-K2Cr2O7混合指示剂,其最佳配比为K2CrO4:K2Cr2O7=6:1（质量比）,体系的最佳pH为5．8,测得l-乳酸乙酯与对甲苯碘酰氯反应制备和的l-对甲苯磺酰乳酸乙酯的产率为94．0％。     

D-酒石酸正辛酯的合成

以D-酒石酸和正辛醇为原料合成了手性拆分剂D-酒石酸正辛酯,其结构经IR确证。通过正交实验得优化反应条件为：D-酒石酸100mmol,n(D-酒石酸)：n(正辛醇)=1．0：2．8,对甲苯磺酸0．5g,甲苯55mL,慢速搅拌,酯化率在98％以上,收率达90％。     

1,2,4-三嗪类化合物的研究(ⅩⅩ)——利用波谱分析确定3-甲硫基-5-羟基-1,2,4-三嗪的取代苯磺酰化反应及其产物的结构

为寻找有效的抗肿瘤药物,作者对1,2,4-三嗪类化合物(6-氮杂尿嘧啶)的化学性质进行了研究,发现3-甲硫基-5-羟基-1,2,4-三嗪(1)在无水吡啶中与对甲苯磺酰氯发生不正常的对甲苯磺酰化反应,生成N-[6-(3-甲硫基-5-负氧基)-1,2,4-三嗪基]吡啶内鎓盐以及对甲苯磺酸对甲苯硫酚酯。为了研究其反应机理,把溶剂改为等摩尔NaOH的CH_3COCH_3-H_2O溶液,重复文献的实验。反应产物分离提纯后,确定其结构为3-甲硫基-4-对甲苯磺酰基-5-氧代-6-羟基-1,4,5,6-四氢-1,2,4-三嗪(2a)。此反应特点是:在1,2,4-三嗪环的4-氮上     

利用固相反应制备冠醚的常用原料

以NaOH为碱,多甘醇,二乙醇胺及多乙烯胺直接与对甲苯磺酰氯在研磨下发生反应,制备了三类冠醚合成中的常用原料,收率56％-92％。     

2-(4-溴甲基苯基)丙酸乙酯的合成

以甲苯为原料,对甲苯磺酰乳酸乙酯为Friedel—Crafts烷基化试剂,N-溴代丁二酰亚胺为溴化剂,合成了洛索洛芬的关键中间体——2-（4-溴甲基苯基）丙酸乙酯。其结构经1^H NMR,IR和MS表征。优化反应条件为：催化剂50．0g,回流反应6h,甲苯104．0mL,侧链溴化的引发剂为过氧化苯甲酰。总收率70％。     

聚合物假冠醚研究（Ⅰ）单体乙二醇二苯醚的合成与表征

本文以乙二醇为底物,通过中间体乙二醇二苯磺酸酯,合成出了乙二醇二苯醚。对两合成产物进行了红外光谱、薄层色谱。溶解性能及结晶分析,实验结果表明,在乙二醇二苯磺酸酯的合成中,因为使用苯磺酰氯代替了传统的对甲苯磺酰氯磺酰化试剂,并用氯仿做稀释剂以控制催化剂吡啶的恰当使用量,使合成不但经济而且获得82．5％,的较高收率,在乙二醇二苯醚的合成中,采用回流,蒸馏交替使用的实验方法,同时用馏出物沸点数值监控和及时排除体系的水份,使产率达到78．0％。     

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.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

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.     

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.     

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.     

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.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.