1a,3-二苯基-1,1,4,4-四氯-1a,2,3,4-四氢-1H-吖丙啶并[2,1-e][1,6]苯并硫氮杂辛因的合成及晶体结构

苯并杂类化合物为常用镇静剂及治疗心血管疾病和抗病毒的药物［１～３］,苯并杂与五六元杂环并合形成的三环化合物也是重要的药用杂环化合物,如１,４－苯并二氮杂与１,２,４－三唑并合形成的三环化合物为常用的治疗中枢神经系统疾病药物［４］．而吖丙啶与１,...     

1,5-苯并硫氮杂氯代β-内酰胺衍生物的合成、光谱及立体化学

苯并硫氮杂是一类具有重要生理活性的七元杂环化合物, 近年来, 通过亚胺双键(CN)的环加成反应向此类化合物分子中引入新的环系引起了人们的关注[1～4].     

1，5—苯并硫氮杂Zuo氯代β—内酰胺衍生物的合成、光谱及立体化学

苯并硫氮杂Zuo是一类具有重要生理活性的七元杂环化合物,近年来,通过亚胺双键（C＝N）的环加成反应向此类化合物分子中引入新的环系引起了它们的关注^[1-4]。这项工作对于合成新的杂Zuo类化合物从而筛选出具有特殊生理活性的物质有着重要意义。本文通过1,5－苯并硫氮杂Zuo与氯乙烯酮的反应向原分子中并合一个β－内酰胺活性单元,合成了一系列新型的1,5－苯并硫氮杂Zuo-α氯代－β－内酰胺衍生物（B1－B5）,研究了它们的波谱特征及立体结构。     

1,5-苯并硫氮杂-α-苯基-β-内酰胺的合成、结构及谱学性质

苯并硫氮杂草是一类具有多种生理活性的七元杂环化合物,近年来,其各类衍生物的合成及性质的研究受到人们的关注[1-5]．我们曾用氯乙酸氯与1,5-本并硫氮杂反应合成了具有两个活性结构单元的1,5-苯并硫氮杂-β-内酰胺衍生物．并发现其产物具有确定的构型[6]．为了研究可能具有更好生理活性的α-烃基-β-内酰胺的杂草衍生物．我们合成了4个新的苯基取代的杂衍生物（Ⅱa-Ⅱd）,研究了它们的谱学特征和立体结构是实验部分1．l仪器与试剂WC－1型显微熔点仪;PE－M－1730型博里叶变换红外光谱仪,KBr压片;ZABSPEC型质谱仪,电子轰击式…     

1,5-苯并硫氮杂(艹卓)-α-氨基-β-内酰胺衍生物的合成及立体结构(Ⅱ)

用一种甘氨酸N-端保护试剂和1,5-苯并硫氮杂反应, 合成了5个1,5-苯并硫氮杂-α-氨基-β-内酰胺衍生物, 其结构经元素分析、 1H NMR, MS和IR确证. 用X射线衍射法确定了产物的立体结构, 结果表明, 该反应具有立体专一性, 四元环上的两个取代基位于环的同侧, 为顺式结构, 产物分子中的七元环为稳定的类椅式构象.     

1,5-苯并硫氮杂(艹卓)-α-苯基-β-内酰胺的合成、结构及谱学性质

苯并硫氮杂(艹卓)是一类具有多种生理活性的七元杂环化合物,近年来,其各类衍生物的合成及性质的研究受到人们的关注[1～5].我们曾用氯乙酰氯与1,5-苯并硫氮杂(艹卓)反应合成了具有两个活性结构单元的1,5-苯并硫氮杂(艹卓)-β-内酰胺衍生物,并发现其产物具有确定的构型[6].为了研究可能具有更好生理活性的α-烃基-β-内酰胺的杂(艹卓)衍生物,我们合成了4个新的苯基取代的杂(艹卓)衍生物(Ⅱa-Ⅱd),研究了它们的谱学特征和立体结构.     

高效液相色谱法测定1,5-苯并硫氮杂卓-α-(N-噁唑烷酮基)-β-内酰胺类化合物

1，5-苯并硫氮杂卓具有明显的药理活性，可用于治疗心血管疾病及抗焦虑等症状。在化工方面，可用作抗氧剂，在农药方面．可用作杀虫剂，引起了有机化学工作者的极大关注。考虑到已应用于临床的青霉素、头孢菌素等β-内酰胺类抗生素，都具有β-内酰胺结构，为了开发具有新的生理活性的杂     

邻氨基苯硫基-1-丙酮缩合反应动力学及机理

1，5-苯并硫氮杂（Ⅱ）是一类重要的七元杂环化合物，具有明显的生理活性．多年来，其合成、结构及药理活性的研究一直受到广泛关注[1-5]．（Ⅱ）通常由1，3-二烃基-3-邻氨基苯硫基-1-丙酮（简称氨基酮）分子内缩合反应合成．本文用紫外分光光度法结合核磁共振监测反应中间过程     

新型2-氧代-1,2,4-三唑并[3,2-d][1,5]苯并氧氮杂类稠杂环的合成

将取代色满酮(1)与芳肼反应生成的腙与HNCO发生[3+2]环加成反应,加成产物(2)经氧化得到偕偶氮异氰酸酯(3).化合物3在HBF4的催化下发生环化-重排反应,得到新颖的三环系2-氧代-1,2,4-三唑并[3,2-d][1,5]苯并氧氮杂化合物5a～5g.     

1,5-苯并硫氮杂卓-α-恶唑烷酮-β-内酰胺衍生物的光谱研究(Ⅱ)

苯并硫氮杂卓-β-内酰胺化合物是目前广泛用于临床的广谱抗生素药物.它的抗生素生理活性与其结构有着密切联系,为使该类化合物更具生理活性和优良药效,合成了五种新的1,5-苯并硫氮杂卓-α-恶唑烷酮-β-内酰胺衍生物,并用核磁共振(NMR)、质谱(MS)、红外光谱(1R)及元素分析确定了其衍生物结构,分析和讨论了该类衍生物的光谱特征及其规律,确定了该类衍生物结构的分析判据.     

Gold‐Catalyzed Formal C−C Bond Insertion Reaction of 2‐Aryl‐2‐diazoesters with 1,3‐Diketones

The transition‐metal‐catalyzed formal C−C bond insertion reaction of diazo compounds with monocarbonyl compounds is well established, but the related reaction of 1,3‐diketones instead gives C−H bond insertion products. Herein, we report a protocol for a gold‐catalyzed formal C−C bond insertion reaction of 2‐aryl‐2‐diazoesters with 1,3‐diketones, which provides efficient access to polycarbonyl compounds with an all‐carbon quaternary center. The aryl ester moiety plays a crucial role in the unusual chemoselectivity, and the addition of a Brønsted acid to the reaction mixture improves the yield of the C−C bond insertion product. A reaction mechanism involving cyclopropanation of a gold carbenoid with an enolate and ring‐opening of the resulting donor–acceptor‐type cyclopropane intermediate is proposed. This mechanism differs from that of the traditional Lewis‐acid‐catalyzed C−C bond insertion reaction of diazo compounds with monocarbonyl compounds, which involves a rearrangement of a zwitterion intermediate as a key step.     

Synthesis of (E)-alpha,beta-unsaturated amides with high selectivity by using samarium diiodide

Stereoselective beta-elimination of 2-chloro-3-hydroxyamides 1 is achieved by using samarium diiodide to yield alpha,beta-unsaturated amides 2, in which the C=C bond is di- tri-, or tetrasubstituted. The starting compounds 1 are easily prepared by reaction of the corresponding lithium enolates of alpha-chloroamides with aldehydes or ketones at - 78 degrees C. The influence of the reaction conditions and the structure of the starting compounds on the stereoselectivity of the beta-elimination reaction is also discussed.     

Recent advances in transition-metal-catalyzed asymmetric reactions of diazo compounds with electron-rich (hetero-) arenes

The transition-metal-catalyzed reaction of diazo compounds with arenes or heteroarenes is an efficient and straightforward approach to functionalize aromatic compounds. This digest summarizes recent progresses on transition-metal-catalyzed asymmetric reactions of diazo compounds with electron-rich (hetero-) arenes, including C–H functionalization, cascade reaction, cyclopropanation, cycloaddition, Buchner reaction and intramolecular dearomatization.     

Synthesis of fluorinated materials catalyzed by proline or antibody 38C2 in ionic liquid

The utility of reusable ionic liquid-proline (or aldolase antibody 38C2) reaction system, proceeding the aldol reactions, is described. Further, obtained α-chloro-β-hydroxy compounds were transformed to the optically active α,β-epoxy carbonyl compounds. The aldolase antibody 38C2-ionic liquid system was able to reuse in Michael additions and the reaction of fluoromethylated imines.     

Mechanochemical Reactions of Fullerenes under High-Speed Vibration Milling

Since a novel technique called "high-speed vibration milling" (HSVM) was first applied to the Reformatskytype reaction of C60 in 1996, [1] this technique has been applied to various kinds of fullerene functionalizations including the preparation of C120. [2] Most recent reactions of fullerenes under HSVM conditions will be discussed: (1)reaction of C60/C70 with N-alkylglycines and aldehydes (Scheme 1); (2) reaction of C60 with active methylene compounds in the presence of bases (Scheme 2); (3) reaction of C6o with diazo compounds (Scheme 3); (4) reaction of C6o with anthracene derivatives (Scheme 4).     

Etude du comportement d'organometalliques (M = Zn,Mg, Li) vis a vis d'enynes conjuges : I. Cas des carbures: HCCC(R)C(R)(R); influence de la structure sur la reactivite et la regioselectivite

Reactive organometallic compounds such as allyl-zinc, -magnesium, -lithium and saturated lithium compounds are shown to readily undergo addition reactions with conjugated enynes: HCCC(R)C(R)(R), but the reactivity is reduced when the steric hindrance around the double bond is increased. With each organometallic compound used, this reaction is regioselective: 3,4 addition with organozinc compounds, 1,2 addition with organolithium compounds (allyl, butyl) and both 1,2 and 1,4 addition with organomagnesium compounds.     

Ni-Catalyzed Cyclization of Enynes and Alkynylboronates: Atom-Economical Synthesis of Boryl-1,4-dienes

We report a novel atom-economical Ni-catalyzed cyclization reaction of enynes with alkynylboronates. The reaction employs a non-expensive Ni salt, a phosphine-based ligand and easy-handling alkynylboronates as boron–carbon source. The reaction provides complex fused-bicyclic compounds containing borylated 1,4-cyclohexadienes in high yields in short reaction times, involving the formation of two C−C bonds in one step. A reasonable reaction mechanism is proposed based on mechanistic experimental results.     

Reactions of Electron-Rich Olefins with Proton-Active Compounds

Proton-active substances react with certain electron-rich olefins with cleavage of the central C?C double bond to give compounds that can be formally regarded as insertion products of nucleophilic carbenes. If they satisfy certain structural conditions, they isomerize with β elimination to give open-chain compounds. Both CH-acidic compounds and compounds containing NH or OH groups can undergo this reaction. The mechanisms are discussed, and the importance of the intermediate products to biochemistry (thiamine, tetrahydrofolic acid) is indicated.     

Highly selective synthesis of bicyclic quinolizidine alkaloids and their analogues via double RCM reaction of N-alkynyl-N-(1,omega)-alkadienyl acrylamides

The double ring-closing metathesis reaction of N-alkynyl-N-(1,omega)-alkadienyl acrylamides 1 using first- or second-generation Grubbs' catalyst afforded, in a highly selectively manner, the fused bicyclic quinolizidine alkaloid derivatives and their analogues bearing a 1,3-diene moiety, which may further undergo a Diels-Alder reaction with a dienophile to afford N-containing polycyclic compounds. The excellent selectivity of fused/dumbbell-mode cyclization has been realized by the higher reactivity of the electron-rich C=C bond or carbon-carbon triple bond combined with the lower reactivity of the electron-deficient C=C bond toward metallocarbenes and the thermodynamically more stable nature of fused bicyclic compounds 3 vs dumbbell-type bicyclic compounds 4.     

Base-Catalyzed Synthesis of Spiropyrazoloaminonitriles with Arylidene Pyrazolone and Vinylogous Malononitriles through a Cascade Michael Addition and Cyclization

Synthesis of title compounds were accomplished by a reaction of vinyl malononitriles and arylidene pyrazolones catalyzed by base. This protocol proceeds via Michael addition followed by intramolecular cyclization leading to the formation of two new C−C bonds. Further the same reaction was also conducted with α,α-dicyano olefins and vinyl malononitriles to furnish 1,6-dihydro biphenyl compounds. Simple reaction conditions, high yields and compatibility are the advantages of this protocol.