Catalyst-Free Highly Regio- and Stereoselective Ring Opening of Epoxides and Aziridines with Sodium Azide Using Poly(ethylene glycol) as an Efficient Reaction Medium
The present invention provides a compound of Formula (I) or the pharmaceutically acceptable salts, esters, and prodrugs thereof, which are ERK2 inhibitors. The invention also provides a pharmaceutical composition comprising an effective amount of at least one compound of Formula (I) and a pharmaceutically acceptable carrier. The invention also provides a pharmaceutical composition comprising an effective amount of at least one compound of Formula (I) and an effective amount of at least one other pharmaceutically active ingredient (such as, for example, a chemotherapeutic agent), and a pharmaceutically acceptable carrier.
Synthesis and Evaluation of New 1,7-Dioxaspiro[5.5]undecane Ligands: Implications for the Use of Diols in the Desymmetrization of meso Epoxides
作者:Debasis Patra、Lihua Yang、Nancy I. Totah
DOI:10.1016/s0040-4020(99)01044-3
日期:2000.1
The synthesis and preliminary evaluation of two new chiral 1,7-dioxaspiro[5.5]undecane ligands is described. The compounds of interest are readily available in enantiomerically pure form. Chiral organotitanium complexes prepared from these ligands catalyze the ring opening reaction of meso epoxides by TMSN3. A key observation suggests that silylation of the ligand competes with catalyst turnover in
Activation of Carboxylic Acids in Asymmetric Organocatalysis
作者:Mattia Riccardo Monaco、Belén Poladura、Miriam Diaz de Los Bernardos、Markus Leutzsch、Richard Goddard、Benjamin List
DOI:10.1002/anie.201400169
日期:2014.7.1
association of carboxylicacids with chiral phosphoric acid catalysts as a new activation principle for organocatalysis. This self‐assembly increases both the acidity of the phosphoric acid catalyst and the reactivity of the carboxylicacid. To illustrate this principle, we apply our concept in a general and highly enantioselective catalytic aziridine‐opening reaction with carboxylicacids as nucleophiles
Novel substituted 2,4,8-trisubstituted-8H-pyrido[2,3-d]pyrimidin-7-one compounds and compositions for use in therapy as CSBP/p38 kinase inhibitors.
(1<i>S</i>,2<i>R</i>/1<i>R</i>,2<i>S</i>)-<i>cis</i>-Cyclopentyl PNAs (<i>cp</i>PNAs) as Constrained PNA Analogues: Synthesis and Evaluation of <i>a</i><i>eg-cp</i>PNA Chimera and Stereopreferences in Hybridization with DNA/RNA
作者:T. Govindaraju、Vaijayanti A. Kumar、Krishna N. Ganesh
DOI:10.1021/jo049442+
日期:2004.8.1
oligomers at defined positions and through the entire sequence. Hybridization studies with complementary DNA and RNA sequences using UV−Tm measurements indicate that aeg-cpPNA chimera form thermally more stable complexes than aegPNA with stereochemistry-dependent selective binding of cDNA/RNA. Differential gel shift retardation was observed on hybridization of aeg-cpPNAs with complementary DNA.
构象受限的手性PNA类似物是基于在aeg PNA的氨基乙基片段上的1,2 - c is-环戊基部分的立体有择的设计而设计的。已知环戊烷环是相对柔性的系统,其中特性起皱决定了取代基的假轴/假赤道位置。因此,当将该部分施加于常规PNA骨架上时,有利的扭转调节有可能获得必要的杂交能力构象。对映体纯的1,2-顺式-环戊基PNA单体(10a和10b)的合成是通过关键中间体酯2的立体选择性酶水解实现的。将手性(1 S,2 R / 1 R,2 S)-氨基环戊基甘氨酰胸腺嘧啶单体在确定的位置并通过整个序列掺入PNA低聚物中。使用UV- T m测量值对互补的DNA和RNA序列进行的杂交研究表明,aeg - cp PNA嵌合体形成的热稳定性比aeg PNA具有更稳定的复合体,且具有立体化学依赖性的cDNA / RNA选择性结合。在aeg - cp PNA与互补DNA杂交时观察到差异的凝胶移位阻滞。