New Directing Groups for Metal-Catalyzed Asymmetric Carbon–Carbon Bond-Forming Processes: Stereoconvergent Alkyl–Alkyl Suzuki Cross-Couplings of Unactivated Electrophiles
作者:Ashraf Wilsily、Francesco Tramutola、Nathan A. Owston、Gregory C. Fu
DOI:10.1021/ja301612y
日期:2012.4.4
two common protected forms of amines (carbamates and sulfonamides) to serve as directing groups in Ni-catalyzed Suzuki reactions has been exploited in the development of catalytic asymmetric methods for cross-couplingunactivatedalkyl electrophiles. Racemic secondary bromides and chlorides undergo C-C bond formation in a stereoconvergent process in good ee at room temperature in the presence of a commercially
两种常见受保护形式的胺(氨基甲酸酯和磺酰胺)在 Ni 催化的 Suzuki 反应中作为导向基团的能力已被用于开发用于交叉偶联未活化烷基亲电子试剂的催化不对称方法。在市售镍配合物和手性配体存在下,外消旋仲溴化物和氯化物在室温下以良好的 ee 立体收敛过程中形成 CC 键。旨在阐明与 Ni(氨基甲酸酯和磺酰胺的氧)结合的位点的结构对映选择性研究导致发现,砜也可用作外消旋烷基卤化物的不对称 Suzuki 交叉偶联的有用导向基团。据我们所知,这项研究提供了在金属催化的不对称 CC 键形成反应中使用磺酰胺或砜作为有效导向基团的第一个例子。一项机理研究表明,金属转移发生时保留了立体化学,并且由此产生的 Ni-C 键在催化循环的后续阶段不会发生均裂。
SUBSTITUTED PHENYLCYCLOHEXYLGLYCOLATES
申请人:Gant Thomas G.
公开号:US20090247628A1
公开(公告)日:2009-10-01
Disclosed herein are substituted phenylcyclohexylglycolate-based muscarinic acetylcholine receptor modulators of Formula I, processes of preparation thereof, pharmaceutical compositions thereof, and methods of use thereof.
本文揭示了基于取代苯基环己基甘醇酸酯的 Formula I 的肌氨酸乙酰胆碱受体调节剂,其制备方法、药物组合物及使用方法。
On the mechanism of carbon-hydrogen activation in gif-type reactions. Kinetic isotopic effects in pyridine solution.
作者:Barton Derek H.R、Doller Darío、Geletli Yurii V
DOI:10.1016/s0040-4039(00)79382-8
日期:1991.7
Kineticisotopiceffects (KIE) were measured for oxidation, bromination and selenylation of c-C6H12/c-C6D12 in pyridine solution for different Gif-type, Fenton and other systems. The comparison of KIE and relative reactivity data for the pair c-C5H10/c-C6H12 proved that the mechanism of activation in Gif-type reactions is different from a hydrogen atom abstraction.
对于不同的Gif型,Fenton和其他系统,测量了吡啶溶液中c -C 6 H 12 / c -C 6 D 12的氧化,溴化和硒化反应的动力学同位素效应(KIE)。对c -C 5 H 10 / c -C 6 H 12对的KIE和相对反应性数据的比较证明,Gif型反应中的活化机理与氢原子的提取不同。
Kinetic Isotope Effects for the C−H Activation Step in Phase-Transfer Halogenations of Alkanes
作者:Oliver Lauenstein、Andrey A. Fokin、Peter R. Schreiner
DOI:10.1021/ol0059347
日期:2000.7.1
of phase-transfer halogenations (Br and I) of alkanes, significant H/D kineticisotopeeffects (KIE = 4-5) indicate that hydrogen abstraction is rate limiting. The excellent agreement of computed and experimentally determined H/D KIE as well as trapping experiments support the involvement of trihalomethyl radicals in the activation step.
在烷烃的相转移卤化(Br和I)范围内,显着的H / D动力学同位素效应(KIE = 4-5)表明氢的提取是速率限制。计算和实验确定的H / D KIE以及捕获实验的极好的一致性支持了三卤甲基自由基参与活化步骤。
TRICYCLIC HETEROCYCLIC COMPOUNDS, COMPOSITIONS AND METHODS OF USE THEREOF
申请人:Babu Srinivasan
公开号:US20110201593A1
公开(公告)日:2011-08-18
The invention provides novel compounds of formula I having the general formula:
wherein R
1
, R
2
, R
3
, X and Y are as described herein. Accordingly, the compounds may be provided in pharmaceutically acceptable compositions and used for the treatment of immunological or hyperproliferative disorders.