我们介绍了使用NiFe 2 O 4磁性纳米粒子作为可重复使用的多相纳米催化剂,通过C- O键活化一锅无味地合成不对称和对称二芳基硫化物的绿色方法。不对称硫化物的合成是在碱金属和NiFe 2 O 4磁性纳米粒子存在下,使用酚酸酯(如乙酸酯,三氟甲磺酸酯和甲苯磺酸酯)与芳基硼酸/ S 8或三苯基氯化锡/ S 8作为硫醇化剂的交叉偶联反应进行的作为催化剂,在60-85°C的聚乙二醇溶剂中。同样,使用S 8从酚类化合物合成对称的二芳基硫醚描述了在120℃下在二甲基甲酰胺中作为硫源的NiFe 2 O 4和作为催化剂的NiFe 2 O 4。使用这些方案,由于使用了可磁重复使用的双金属纳米催化剂,并且避免了使用硫醇和芳基卤化物,各种不对称和对称硫化物的合成比使用可用方案更容易。
This invention relates to compounds of the formula (I):The invention also relates to processes for the preparation of the compound of the formula (I), pharmaceutical agents or compositions containing the compound or a method of using the compound for the treatment of proliferative diseases, such as cancer.
Low-temperature photooxygenation of coelenterate luciferin analog synthesis and proof of 1,2-dioxetanone as luminescence intermediate
作者:Ken Usami、Minoru Isobe
DOI:10.1016/0040-4020(96)00699-0
日期:1996.9
13C-enriched coelenterate luciferin analogs were photooxygenated at −78°C to form two peroxidic products as luminescent intermediates. Structures of these unstableintermediates were deduced by means of 13C NMR spectra at low temperatures using substrates enriched at three sites by 13C. Photooxygenation in a mixture of CF3CD2OD and CD3OD as highly protic solvents afforded the dioxetanone and 2-hydroperoxide. These
在2-位具有叔丁基的腔肠荧光素类似物适合在各种条件下进行化学发光研究。在低温(-78°C)下对类似物进行光氧化可得到发光中间体,该发光中间体通过用PPh 3还原而被证明是过氧化物,从而导致发光能力下降。为了通过13 C NMR阐明这些积累的发光中间体的结构,在3,7-二氢咪唑并[1,2-a]吡嗪-3-酮的2、3和5位合成了三个13 C富集的类似物。骨架具有99%的富集和位点特异性。这13个将富C的腔肠荧光素类似物在-78°C进行光氧化,以形成两种过氧化物产物,作为发光中间体。这些不稳定的中间体的结构用的手段推断13 C NMR光谱在使用在三个位点被富集的底物低的温度13 ℃。在光氧化CF的混合物3 CD 2 OD和CD 3 OD为高度的质子溶剂,得到dioxetanone和2 -氢过氧化物。在含有酸或碱的二甘醇二甲醚(DGM)中稀释到10 -5 M后,这两种过氧化物在不同的温度下分别在400
Copper-Catalyzed C–S Bond Formation via the Cleavage of C–O Bonds in the Presence of S8 as the Sulfur Source
synthesis of unsymmetrical and symmetrical diaryl sulfides via C–O bond activation are presented. First, a new efficient procedure for the synthesis of unsymmetrical sulfides using the cross-coupling reaction of phenolic esters such as acetates, tosylates, and triflates and with arylboronic acid or triphenyltin chloride as the coupling partners is reported. Depending on the reaction, S8/KF or S8/NaOt-Bu
A new method for the preparation of active esters using di-2-pyridyl carbonate
作者:Sunggak Kim、Young Kwan Ko
DOI:10.1039/c39850000473
日期:——
The use of di-2-pyridylcarbonate in the presence of a catalytic amount of 4-dimethylaminopyridine is found to be very effective in the preparation of various activeesters.
发现在催化量的4-二甲基氨基吡啶的存在下使用碳酸二-2-吡啶基碳酸酯在制备各种活性酯中非常有效。
[EN] DIPHENYL SUBSTITUTED CYCLOALKANES<br/>[FR] CYCLOALCANES SUBSTITUÉS PAR DES DIPHÉNYLES
申请人:MERCK & CO INC
公开号:WO2009048547A1
公开(公告)日:2009-04-16
The present invention provides compounds of Formula I which are FLAP inhibitors useful as anti-atherosclerotic, anti-asthmatic, anti-allergic, anti-inflammatory and cytoprotective agents.