Transition-Metal-Free Decarboxylative Arylation of 2-Picolinic Acids with Arenes under Air Conditions
作者:Xitao Zhang、Xiujuan Feng、Chuancheng Zhou、Xiaoqiang Yu、Yoshinori Yamamoto、Ming Bao
DOI:10.1021/acs.orglett.8b03043
日期:2018.11.16
transition-metal-free, and direct decarboxylative arylation of 2-picolinic acids with simple arenes is described. The oxidativedecarboxylative arylation of 2-picolinic acids with arenes proceeds readily via N-chloro carbene intermediates to afford 2-arylpyridines in satisfactory to good yields under transition-metal-free conditions. This new type of decarboxylative arylation is operationally simple
Enantioselective Synthesis of α-(Hetero)aryl Piperidines through Asymmetric Hydrogenation of Pyridinium Salts and Its Mechanistic Insights
作者:Bo Qu、Hari P. R. Mangunuru、Sergei Tcyrulnikov、Daniel Rivalti、Olga V. Zatolochnaya、Dmitry Kurouski、Suttipol Radomkit、Soumik Biswas、Shuklendu Karyakarte、Keith R. Fandrick、Joshua D. Sieber、Sonia Rodriguez、Jean-Nicolas Desrosiers、Nizar Haddad、Keith McKellop、Scott Pennino、Heewon Lee、Nathan K. Yee、Jinhua J. Song、Marisa C. Kozlowski、Chris H. Senanayake
DOI:10.1021/acs.orglett.8b00067
日期:2018.3.2
α-heteroaryl piperidines is reported. The key step is an iridium-catalyzed asymmetric hydrogenation of substituted N-benzylpyridinium salts. High levels of enantioselectivity up to 99.3:0.7 er were obtained for a range of α-heteroaryl piperidines. DFT calculations support an outersphere dissociative mechanism for the pyridinium reduction. Notably, initial protonation of the final enamine intermediate
报道了 α-芳基和 α-杂芳基哌啶的对映选择性合成。关键步骤是取代的N-苄基吡啶鎓盐的铱催化不对称氢化。一系列 α-杂芳基哌啶获得了高达 99.3:0.7 er 的高水平对映选择性。DFT 计算支持吡啶还原的外层解离机制。值得注意的是,最终烯胺中间体的初始质子化决定了转化的立体化学结果,而不是所得亚胺中间体的氢化物还原。
Luminescent organometallic compound and light emitting device
申请人:——
公开号:US20030040627A1
公开(公告)日:2003-02-27
A luminescent organometallic compound having the chemical structure represented by the general formula (1) or (2):
1
[in the general formulas (1) and (2), A and B represent ring structures, M represents a metallic atom, X represents a hetero atom other than carbon and hydrogen, Y represents at least one electron-attracting group connecting to ring structure B, Lb represents a unidentate or multidentate ligand, and p, q and r represent positive integers.]
具有通式(1)或(2)所代表的化学结构的发光有机金属化合物:
1
[在通式(1)和(2)中,A 和 B 代表环结构,M 代表金属原子,X 代表除碳和氢以外的杂原子,Y 代表至少一个与环结构 B 相连的引电子基团,Lb 代表非同位或多同位配体,p、q 和 r 代表正整数;