Catalytic Asymmetric SiO Coupling of Simple Achiral Silanes and Chiral Donor-Functionalized Alcohols
作者:Andreas Weickgenannt、Marius Mewald、Thomas W. T. Muesmann、Martin Oestreich
DOI:10.1002/anie.200905561
日期:2010.3.15
Silicon alley: SiH and HOR are enantioselectively coupled in the presence of a chiral CuH complex. In this way, the kinetic resolution of racemic mixtures of alcohols is accomplished through asymmetric protection with standard silanes (see scheme; R=aryl or alkyl, Ar=3,5‐xylyl, Np=2‐naphthyl; s=selectivity factor).
硅胡同:硅 H和H 或者,对映选择性地耦合在手性铜的存在 H络合物。通过这种方式,醇的外消旋混合物的动力学拆分可通过使用标准硅烷进行不对称保护来实现(参见方案; R =芳基或烷基,Ar = 3,5-二甲苯基,Np = 2-萘基; s =选择性因子)。
Ruthenium carbonyl complexes supported by pyridine-alkoxide ligands: synthesis, structure and catalytic oxidation of secondary alcohols
作者:Siqi Zong、Kang Liu、Xiaohui Yue、Zhiqiang Hao、Zhihong Ma、Zhangang Han、Guo-Liang Lu、Jin Lin
DOI:10.1039/c9nj03222c
日期:——
Five novel trinuclear rutheniumcomplexes [[PyCHC(RC6H4)O]2Ru3(CO)8] [R = 4-OMe (6), 4-Br (7), 4-CF3 (8)] and [[PyCH2CH(RC6H4)O]2Ru3(CO)8] [R = 2-Br (9), 2-CF3 (10)], were synthesized by treating Ru3(CO)12 with two equivalents of the corresponding pyridine-alcohols PyCH2CH(RC6H4)OH [1–5, R = 4-OMe, 4-Br, 4-CF3, 2-Br and 2-CF3] in refluxing toluene. The structures of 6–10 were fully characterized by
五个新颖的三核钌配合物[[PyCH C(RC 6 H 4)O] 2 Ru 3(CO)8 ] [R = 4-OMe(6),4-Br(7),4-CF 3(8)]和[[PyCH 2 CH(RC 6 H 4)O] 2 Ru 3(CO)8 ] [R = 2-Br(9),2-CF 3(10)]通过处理Ru 3(CO)合成12与两个当量的相应吡啶醇PyCH 2 CH(RC在回流甲苯中的6 H 4)OH [ 1-5,R = 4-OMe,4-Br,4-CF 3,2 -Br和2-CF 3 ]。通过IR和NMR光谱,元素分析和X射线单晶衍射对6-10的结构进行了充分表征。发现它们是NMO氧化仲醇的有效催化剂,可在15分钟内以良好至极好的收率得到相应的酮,其中[PyCHC(4-OCH 3 C 6 H 4)O] 2 Ru 3( CO) 8( 6)是最好的。
Lewis-Acid-Catalyzed Benzylic Reactions of 2-Methylazaarenes with Aldehydes
作者:Dan Mao、Gang Hong、Shengying Wu、Xin Liu、Jianjun Yu、Limin Wang
DOI:10.1002/ejoc.201400073
日期:2014.5
Lewis-acid-catalyzedbenzylicreactions of 2-methylazaarenes with aldehydes have been investigated. Series of azaarene derivatives were afforded by this reaction. 2-(Pyridin-2-yl)ethanols with common substituents were formed through the LiNTf2-promoted aldol reaction for the first time. 2-Alkenylpyridines, exclusively in the form of the E isomers, were synthesized in the presence of LiNTf2 cooperated
已经研究了路易斯酸催化的 2-甲基氮杂芳烃与醛的苄基反应。该反应得到一系列氮杂芳烃衍生物。首次通过LiNTf2促进的羟醛反应形成了具有常见取代基的2-(Pyridin-2-yl)乙醇。在 LiNTf2 与 H2NTf 协同作用下,合成了仅以 E 异构体形式存在的 2-烯基吡啶。在La(Pfb)3催化下,2-甲基喹啉与醛类在空气中反应,以高收率得到2-烯基喹啉。
Highly efficient asymmetric bioreduction of 1-aryl-2-(azaaryl)ethanones. Chemoenzymatic synthesis of lanicemine
作者:Ramón Liz、Elisa Liardo、Francisca Rebolledo
DOI:10.1039/c9ob01616c
日期:——
1-Aryl-2-(azaaryl)ethanols with ee > 99% have been prepared by KRED-catalyzed reduction of the ketone precursors. A chemoenzymatic synthesis of lanicemine is described.
AN ALDOL-TYPE REACTION OF ACTIVE METHYL GROUPS OF NITROGEN-CONTAINING HETEROAROMATIC COMPOUNDS
作者:Hiroshi Hamana、Tsutomu Sugasawa
DOI:10.1246/cl.1983.333
日期:1983.3.5
Active methyl groups of nitrogen-containing heteroaromatic compounds react with benzaldehydes in the presence of 9-BBN triflate and diisopropylethylamine in dichloromethane to give the corresponding aldol-type products under mild conditions.