含三氟甲基的螺[环丙烷-1,3'-吲哚啉]-2'-酮和螺[环丙烷-1,2'-茚]-1',3'-二酮衍生物的高立体选择性简易合成

采用3-(4-三氟甲基苯亚甲基)吲哚啉-2-酮和2-(4-三氟甲基苯亚甲基)-1H-茚-1,3(2H)-二酮分别与鉮盐在二氯甲烷中,碳酸钾或氟化钾存在下反应,可高产率、高立体选择性地得到以反式构型为主的含三氟甲基的3'-螺环丙基取代的氧化吲哚和2'-螺环丙基取代的茚二酮衍生物.产物相对构型经X射线单晶衍射或1H-1H NOESY谱确定.还从反应机理的角度对产物构型做了解释.     

1-苯基-3-甲基-5-吡唑啉酮与芳醛的绿色反应研究

Villemin[1]曾报道KSF/蒙托土催化下微波促进1-苯基-3-甲基-5-吡唑啉酮(1)与醛2的缩合反应,李晓陆[2研究了该反应的固相缩合,Sun[3]报道了KF-Al2O3催化下甲醇溶液中的反应.本文采用绿色合成原则,无催化剂条件下无溶剂微波辐射及水中回流方法研究了此反应,得到两类化合物(图1).产物结构经1H NMR,13C NMR,MS及IR确证.实验发现辐射功率对产物有很大影响,高辐射功率下得到4-芳甲叉-3-甲基-1-苯基-5-吡唑啉酮(3),低辐射功率得到4,4′-芳甲叉-双(3-甲基-1-苯基-5-吡唑啉酮)(4);水相反应同时得到两种产物,以产物3为主(表1).产物结构与反应物配比无关.     

7-(羟甲基)-8-氮杂螺[4.5]癸烷-8-羧酸叔丁酯的合成

以8-氮杂螺[4.5]癸烷-7,9-二酮为原料,通过酰胺还原、N-Boc保护、甲酰化、醛基四步反应还原反应合成得到目标化合物7-(羟甲基)-8-氮杂螺[4.5]癸烷-8-羧酸叔丁酯,总收率29.8%。反应中间体及产物结构经1H NMR和ESI-MS确证,同时对每步反应条件进行讨论。该研究提供了一种新结构的含氮螺环化合物的合成路线。     

含吡唑啉酮氨基脲类化合物的合成及结构

以1-苯基-3-甲基-吡唑啉酮-5 (PMP)和1,3-二苯基-吡唑啉酮-5 (DPP)为原料合成了六种4-酰基吡唑啉酮,并分别与氨基脲缩合,得到六个新的含吡唑啉酮环的缩氨基脲类化合物.用IR, ¹H NMR和¹³C NMR对各化合物进行了表征及结构确证,并用X射线单晶衍射法测定了化合物1c [1-苯基-3-甲基-4-丙酰基-吡唑啉酮-5缩氨基脲(PMPP-SC)]的晶体结构.     

1-甲基-3-丙基-4-氨基吡唑-5-甲腈的研究

以1-甲基-3-丙基吡唑-5-甲酸为原料,经酰化、脱水、硝化、还原反应合成了1-甲基-3-丙基-4-氨基吡唑-5-甲腈,然后与醛类缩合得到吡唑并嘧啶酮衍生物.在Pd/C催化氢化1-甲基-3-丙基-4-硝基吡唑-5-甲腈的过程中,利用HPLC和HPLC-HRMS分离检测到硝基还原为氨基过程的3个中间体:羟胺、氧化偶氮、偶氮化合物,提出了可能的还原机理.产物结构经~1H NMR,~(13)C NMR,IR和MS分析表征.     

硫代丁内酯拼接吡唑啉酮双螺环化合物的合成

以3-异硫氰酸酯取代的硫代丁内酯1为合成子,在有机催化剂DABCO作用下,与各种取代的吡唑啉酮烯烃2发生Michael加成与环化反应,获得了9个未见文献报道的新型硫代丁内酯拼接吡唑啉酮双螺环化合物3a~3i,产率70%~77%, dr 2/1~9/1,其结构经¹H NMR, ¹³C NMR和HR-MS（ESI-TOF）表征,通过单晶进一步确定了化合物3c的构型。该类化合物含有螺环丁内酯和螺环吡唑啉酮生物活性骨架,对医药行业具有重要的潜在价值。     

无溶剂无催化剂微波促进下 1-苯基-3-甲基-5-吡唑啉酮与芳醛的反应研究

无溶剂无催化剂条件下,微波促进1-苯基-3-甲基-5-吡唑啉酮与芳醛的缩合反应选择不同辐射功率将分别得到4-芳亚甲基-3-甲基-1-苯基-5-吡唑啉酮和4,4′-芳亚甲基-双(1-苯基-3-甲基-5-吡唑啉酮),产率良好.产物结构经1H NMR,13CNMR和IR进行了表征.     

新型4-双取代吡唑啉酮合成子的合成

吡唑啉酮类化合物是一类功能强大的合成子,具有多取代、多活性位点的特性,目前关于4-双取代吡唑啉酮合成子的研究相对较少。本研究以4-无取代吡唑啉酮为起始原料,在温和简便的条件下,顺利构建了一系列4-氯取代的4-双取代吡唑啉酮化合物(4a～4i),分离收率为66%～91%,其结构经¹H NMR、¹³C NMR和HR-MS(ESI)表征。4a成功参与1,3-偶极反应,在常温条件下,以46%的收率得到新型[3+2]环加成产物。     

含氮杂环化合物固相化学反应研究——Ⅰ.3. -甲基-1-苯基-5-吡唑啉酮与羰基化合物的固相反应

研究了含氮杂环化合物3-甲基-1-苯基-5-吡唑啉酮(MPP)与芳香醛酮、苯偶酰衍生物和酰亚胺的固相反应及与4-芳甲叉基-3-甲基-1-苯基-5-吡唑啉酮2的固相Michael加成反应.不同的条件下,反应产物不同,发现了这些化合物之间的一些新的固相反应,由此得到了一系列新化合物,产物的结构由IR,~1HNMR,MS、元素分析及晶体X-射线衍射确定,并对反应机理进行了初步探讨.     

4-二甲氨基吡啶促进的一锅法合成高选择性螺环丙烷吡唑啉酮衍生物（英文）

发展了一种4-二甲氨基吡啶(DMAP)促进的高立体选择性合成多取代螺环丙烷吡唑啉酮的方法.该反应以吡唑啉酮、芳醛和溴乙酸酯为原料, DMAP作为碱,经三组分一锅反应,合成一系列收率高且非对映选择性好的目标化合物.该反应具有操作简单、产率高以及非对映选择性好等优点.该合成方法对于螺环丙烷的研究具有重要的价值.     

Reactivity of aldehydes with semi-stabilised arsonium ylide anions: synthesis of terminal (e)-1,3-dienes

A study of the reactivity of semi-stabilised arsonium ylide anions in olefination reactions is presented. The different ylide anions were generated by the addition of nBuLi to various arsonium halide derivatives: [Ph(2)As(R)R'](+)X(-), where R and R' are methyl, allyl, prenyl or benzyl groups. By using diallyldiphenylarsonium bromide (R=R'=allyl) an olefination protocol was optimised allowing the efficient transformation of aliphatic aldehydes into terminal 1,3-dienes with a high selectivity for the E isomer (E/Z ratios ranging from 90:10 to 97:3). The olefination reactions of aldehydes with dissymmetric arsonium halides (R not equal R') are very chemoselective; with arsonium ylide anions the benzyl moiety is more reactive than the allyl moiety which is much more reactive than prenyl and methyl groups. Based on the experimental results, a mechanism is proposed for the reaction.     

The crystal and molecular structure of pentafluoropropionylbenzoylmethylene triphenylphosphorane

The crystals of pentafluoropropionylbenzoylmethylene triphenylphosphorane that bears two strongly electron-withdrawing groups in alkylidene moiety are monoclinic and its space group is C2/c, with a = 11.271(3)Å, b = 18.253(6)Å, c =23.938(7)Å, β = 91.09(2)°, z = 8. The X-ray diffraction intensity data were collected on a four-circle diffractometer. The structure has been solved by direct method and refined by block-diagonal least-squares method. The final R- index was 0.075 for 3146 independent observed reflexions. In this paper the structure of this ylide is compared with that of corresponding arsonium ylide previously reported. Both ylidic skeleton structures are planar with sp² hybridization. The bond length of P-C(1) is 1.748 (5)Å with bond order. 1.60 while the bond order of As-C(1) in the corresponding arsonium ylide is 1.46, indicating that the phosphonium ylide has a greater contribution of “ylene” structure to the overall structure. As a result the phosphonium ylide should be less reactive than the corresponding arsonium ylide. In both ylides, (he major delocalized canonical forms of negative charge are shown to be 3.     

A New Synthesis of Vinyl Halides via α-Halo Substituted Semistabilized Arsonium Ylide

As the first example 4 of the Wittig reaction of α-halo substituted semistabilized arsonium ylide, we utilized this reaction to synthesize vinyl iodides 5.     

Studies on ylides: Carbonyl olefination with (p-nitro benzylidene)triphenylarsenane

(p-Nitrobenzylidene)triphenylarsenane, a semistabilized arsonium ylide has been prepared and reacted with carbonyl compounds to yield olefins as opposed to epoxidation products. Treatment of the ylide with a ranged acyl halides gave new disubstituted arsonium ylides. IR and NMR spectral data for the resulting products are reported.     

A study of influence of temperature and <Emphasis Type="Italic">N</Emphasis>, <Emphasis Type="Italic">N</Emphasis>-acyl protected keto ylides structure on their predominant transformations

The effect of temperature and keto ylides structure on preference of their intramolecular cyclization leading to N-containing heterocyclic compounds or linear products formation has been investigated at the B3LYP/6-31G(d,p) level of theory. It has been determined that the thermodynamic advantage of the cyclization reactions of ylides increases with temperature, while Gibbs free energies of linear products formation reactions depend insignificantly on temperature. The Wittig and the Corey–Chaykovsky reactions are least probable in the case of the sulfonium and ammonium ylides considered. However, for phosphonium ylides the Wittig reaction must be considerably preferable in comparison with other routes, while behavior of the arsonium ylides is predicted to be more complex. Research of S-ylides transformations shows that formation of methylthio-substituted heterocycles with five-, six- or seven- membered rings is possible from a thermodynamic standpoint, while conversion of the corresponding ylide to a four-membered heterocycle is disadvantageous. Presence of a methyl substituent and its position in the ylide carbon chain depends ambiguously on the behavior of sulfur keto ylides.     

A Direct Route to C-Vinylaziridines: Reaction of N-Sufonylimines with Allylic Ylides under Phase-Transfer Conditions or with Preformed Ylides at Low Temperature

Allylic sulfonium salts 3, 5, 7, 11, 12, 13, and arsonium salt 14 react with aromatic, heteroaromatic, and alpha,beta-unsaturated N-sulfonylimines under solid-liquid phase-transfer conditions in the presence of KOH at room temperature to produce, respectively, vinyl-, (beta-phenylvinyl)-, and [beta-(trimethylsilyl)vinyl]aziridines in excellent yields within several minutes. In some cases, pyrroline compound 9 is obtained as a minor product. This aziridination reaction has also been carried out with preformed ylides, generated from sulfonium salts 3, 7, arsonium salt 14, and telluronium salts 15, 16 with a base in THF at -78 degrees C. In most examples, quantitative yields were achieved. However, the trans/cis selectivity of the reaction was not high in either case. A semistable allylic sulfonium ylide, i.e., dimethylsulfonium 3-(trimethylsilyl)allylide, was found to not undergo an expected [2,3]-sigma-rearrangement and so can also be used in this reaction.     

Synthesis of stable arsonium and sulfur ylides from perfluoroalkanesulfonyl diazocarbonyl compounds and their X-ray diffraction analysis

A series of stable fluorine-containing arsonium ylides and sulfur ylides were simply synthesized from perfluoroalkanesulfonyl diazocarbonyl compounds in the presence of rhodium catalyst. The ylide products are fairly stable due to the strong electron-withdrawing properties of perfluoroalkanesulfonyl group and carbonyl group. They are fully confirmed by spectral methods and the structures of 3ba and 3cd are also established by X-ray single crystal diffraction analysis. Several interesting features about the ylide structures and some weak fluorine interaction between them are described here.     

One-pot synthesis of novel photochromic oxazine compounds

A one-pot domino synthesis of photochromic 2,2-diarylphenanthro-(9,10)-[2H]-[1,4]-oxazines in excellent yield is described starting with acrylic acid derivatives. The reaction mechanism was studied by ReactIR and UV-vis. The cascade sequence of the reactions involves five transformations, namely, acyl azide formation, Curtius rearrangement, arsonium ylide formation, aza-Wittig, and final cyclization to the title compounds.     

Tributylarsonium-2,2,3,3,4,4-hexafluorocyclobutane ylide. Preparation and cleavage

$\text{F}$-cyclobutene forms a stable ylide with $\text{n}$-tributylarsine. In contrast to the halogen cleavage of the analogous phosphonium ylide, which gives 1,1-dihaloalkanes, the arsonium ylide reacts with bromine and iodine to give the 1-halo-$\text{F}$-cyclobutenes.     

The first example of α-organoseleno arsonium ylides and its Wittig-type reaction

α-Organoseleno arsonium ylide 3 was synthesized for the first time by a phenylselenenylation-transylidation reaction. It has sufficient activity to carry out the Wittig-type reaction, affording a novel method for the stereoselective synthesis of (Z)-α-phenyl-seleno-α, β-unsaturated esters 6.