用钯改性的二氧化铈负载的catalyst催化剂(ReO x -Pd / CeO 2(Re = 2 wt%,Pd / Re = 0.25))仍然是同时加氢脱氧的最佳催化剂。较高的Re加载量降低了活性。环状邻位二醇的同时加氢脱氧以高的顺式-立体选择性发生。通过XRD,TEM,H 2 -TPR,XAFS,XPS,拉曼和DFT计算来表征ReO x -Pd / CeO 2催化剂。还原后和1,2-己二醇与1-己烯的化学计量反应后,ReO x -Pd / CeO 2(Re = 2 wt%,Pd / Re = 0.25)催化剂上的Re种类分别为Re IV和Re VI,并且Re IV物种通过化学计量反应转化为Re VI。有人提出ReO x –Pd / CeO 2上的Re物种随机位于CeO 2表面,并且可能只有单体Re物种具有同时加氢脱氧的催化活性。该模型可以解释Re = 2 wt%的催化剂比高Re载量的催化
Polymer-mediated cyclodehydration of alditols and ketohexoses
摘要:
The polymer PEDOT+ (1 or 2) mediates a cyclodehydration reaction with alditols 3, 5, 7, 9, in hydrocarbon solvents, to give cyclic ethers 4, 6, 8, or 10, respectively, in high yield with a trivial isolation protocol. Polymers 1 or 2 also mediate the cyclodehydration of ketohexoses such as D-fructose, but not aldohexoses, to the important industrial intermediate 5-hydroxymethylfurfural (17), under milder conditions when compared to reactions mediated by mineral acids. A cascade reaction with ketohexoses is observed in toluene via cyclodehydration followed by Friedel-Crafts alkylation of the initially formed benzylic alcohol to give 16. (C) 2011 Elsevier Ltd. All rights reserved.
A compound represented by the general formula (1):
Q
1
-Q
2
-T
0
-N(R
1
)-Q
3
-N(R
2
)-T
1
-Q
4
(1)
wherein R
1
and R
2
are hydrogen atoms or the like; Q
1
is a saturated or unsaturated, 5- or 6-membered cyclic hydrocarbon group which may be substituted, or the like; Q
2
is a single bond or the like; Q
3
is a group
in which Q
5
is an alkylene group having 1 to 8 carbon atoms, or the like; and T
0
and T
1
are carbonyl groups or the like; a salt thereof, a solvate thereof, or an N-oxide thereof.
The compound is useful as an agent for preventing and/or treating cerebral infarction, cerebral embolism, myocardial infarction, angina pectoris, pulmonary infarction, pulmonary embolism, Buerger's disease, deep venous thrombosis, disseminated intravascular coagulation syndrome, thrombus formation after valve or joint replacement, thrombus formation and reocclusion after angioplasty, systemic inflammatory response syndrome (SIRS), multiple organ dysfunction syndrome (MODS), thrombus formation during extracorporeal circulation, or blood clotting upon blood drawing.
[EN] 1 -(CYCLOPENT-2-EN-1 -YL)-3-(2-HYDROXY-3-(ARYLSULFONYL)PHENYL)UREA DERIVATIVES AS CXCR2 INHIBITORS<br/>[FR] DÉRIVÉS DE 1-(CYCLOPENT-2-EN-1-YL)-3-(2-HYDROXY-3-(ARYLSULFONYL)PHÉNYL)-URÉE UTILISÉS COMME INHIBITEURS DE CXCR2
申请人:GLAXOSMITHKLINE IP DEV LTD
公开号:WO2015181186A1
公开(公告)日:2015-12-03
The invention relates to 1-(3-sulfonylphenyl)-3-(cyclopent-2-en-1-yl)urea derivatives, and their use in treating or preventing diseases and conditions mediated by the CXCR2 receptor. In addition, the invention relates to compositions containing the derivatives and processes for their preparation.
Highly enantioselective transformations on 3,4-dihydroxytetrahydrofurans catalyzed by lipases
作者:Verónica Recuero、Rosario Brieva、Vicente Gotor
DOI:10.1016/j.tetasy.2008.05.027
日期:2008.7
Enzymatic acylations and alkoxycarbonylations of cis- and trans-3,4-dihydroxytetrahydrofuran and hydrolysis of their diacetylated and dialkoxycarbonylated derivatives have been studied. High enantioselectivity is obtained using Pseudomonas cepacia lipase as a catalyst in the hydrolysis of the trans-diacetyl derivative, while for the desymmetrization of the cis-3,4-dihydroxytetrahydrofuran the best
cyclohexanediol) are dimeric, Ph(2)Si(AnErytH(-2)) (3) is monomeric, and Ph(2)Si(L-AnThreH(-2)) (4; AnThre = anhydrothreitol) is trimeric both in the solid state and in solution. Ph(2)Si(cis-CptdH(-2)) (5) (Cptd = cyclopentanediol) is monomeric in solution but dimerizes on crystallization. Si(AnErytH(-2))(2) (6) and Si(cis-CptdH(-2))(2) (7) are monomeric spiro compounds in solution but are pentacoordinate dimers