[PdCl 2 L 2 ]类型的氯化钯的氨基甲酰基吡唑化合物(其中L = C 3 H 3 N 2 CONR 2或C 5 H 7 N 2 CONR 2; R = CH 3, C 2 H 5或i C 3 H 7)已经合成并通过IR,1 H NMR,ES-MS,元素分析和单晶X射线衍射法进行了表征。[PdCl 2(C 3 H 3 N 2CON {C 2 H 5 } 2)2 ](2)表明,钯(II)离子被两个吡唑基氮和两个氯原子呈正方形平面排列所包围,而氨基甲酰基的两个氮原子弱键合金属中心在轴向位置。在[PdCl 2(C 5 H 7 N 2 CON {C 2 H 5 } 2)2 ]的中心对称结构中(5),钯(II)离子被两个吡唑氮包围,两个氯原子形成方形平面排列,并且氨基甲酰基的两个氧原子在轴向位置上弱结合到金属中心。配体通过软吡唑氮以相互反位键合到氯化钯(II)上。氨基甲酰基吡唑基团显示反构象。
制备并表征了[C 3 HR 2 N 2 CONR']类型的新的基于双官能吡唑的配体(其中R = H或CH 3; R'= CH 3,C 2 H 5或i C 3 H 7)。通过红外(IR),1 H NMR,电喷雾质谱(ES-MS),元素分析和单晶X射线衍射方法研究了这些配体与硝酸铀酰和铀酰双(二苯甲酰甲烷酸酯)的配位化学。化合物[UO 2(NO 3)2(C 3 H 3)的结构N 2 CON {C 2 H 5 } 2)](2)显示,在六角形双锥体几何结构中,铀(VI)离子被一个氮原子和七个氧原子包围,该配体充当双齿螯合配体并通过氨基甲酰氧和吡唑基氮原子。在[UO 2(NO 3)2(H 2 O)2(C 5 H 7 N 2 CON {C 2 H 5 } 2)2 ]的结构中,(5)吡唑配体充当第二球配体,并通过氨基甲酰氧和吡唑基氮原子与水分子形成氢键。的结构[UO 2(DBM)2 C ^ 3 ħ 3 Ñ
The current invention provides compounds having a structure according to Formulae 1, 2, 3, and 4:
wherein the A-ring, B-ring, C-ring, m, n, R
25
, R
50
, and R
51
are as described in the specification. The invention also provides pharmaceutical compositions comprising compounds of Formulae 1, 2, 3, and 4, as well as methods of treating cognitive disorders, such as Alzheimer's disease. The invention further provides intermediates useful in preparing the compounds of Formulae 1, 2, 3, and 4.
Selective Palladium‐Catalyzed Direct CH Arylation of Unsubstituted
<i>N</i>
‐Protected Pyrazoles
作者:Esa T. T. Kumpulainen、Antti Pohjakallio
DOI:10.1002/adsc.201301139
日期:2014.5.5
selective C‐5 arylation of N‐dimethylaminosulfamoyl‐protected pyrazole with aryl bromides is catalyzed by 2–5 mol% palladium in the presence of triphenylphosphine ligand and carboxylic acid additive. Selectivities up to 45:1 (C‐5:C‐4) can be achieved by running the reaction in non‐polar solvents. A thorough study of scope and limitations shows good general tolerance of aryl bromide substitution. However