Asymmetric synthesis based on chiral diamines having pyrrolidine ring
作者:Teruaki Mukaiyama
DOI:10.1016/s0040-4020(01)93286-7
日期:——
Various highly stereoselective asymmetric reactions based on chiral diamines having pyrrolidine ring are described. Some of these reactions have been successfully applied to the syntheses of natural products.
Tertiary α-diarylmethylamines derived from diarylketimines and organomagnesium reagents
作者:Alaric Desmarchelier、Pablo Ortiz、Syuzanna R. Harutyunyan
DOI:10.1039/c4cc06719c
日期:——
Organomagnesium reagents enable swift and versatile derivatisation of diarylimines to the corresponding α-substituted diarylmethylamines in excellent yields, through fast and clean reactions.
有机镁试剂使二芳基亚胺能够迅速、多样地衍生为相应的α-取代二芳基甲胺,收率极高,反应快速干净。
Direct synthesis of 4,4-disubstituted N-silyl-1,4-dihydropyridines
作者:Jan Bräckow、Klaus T. Wanner
DOI:10.1016/j.tet.2005.11.069
日期:2006.3
based on the trapping reaction of 4-substitued N-silylpyridinium ions. When performed with dialkylmagnesiumreagents, such as iPr2Mg, silyl protected 4,4-disubstituted 1,4-dihydropyridines were obtained in up to quantitative yields. High 1,4-selectivity was found for sterically demanding nucleophiles, whereas small nucleophiles (Me2Mg) tend to yield 1,2-addition-products. Grignard, dialkylzinc and organocopper
The present invention is directed to a reagent for use in the preparation of organomagnesium compounds as well as to a method of preparing such organomagnesium compounds. The present invention furthermore provides a method of preparing functionalized or unfunctionalized organic compounds as well as the use of the reagents of the present invention in the preparation of organometallic compounds and their reaction with electrophiles. Finally, the present invention is directed to the use of lithium salts - LiY in the preparation of organometallic compounds and their reactions with electrophiles and to an organometallic compound which is obtainable by the disclosed method.
reversibly with a second equivalent of H2 (1 atm) and serves as an olefin hydrogenation catalyst under mild conditions (room temperature, 1 atm H2). A bimetallic Co species is invoked in the rate-determining step of the catalysis according to kinetic studies. A structurally related Ni(I)Ni(I) dimer, [((Ph)PBP)Ni]2 (3), has also been prepared. Like Cocatalyst1, Ni complex 3 displays reversible reactivity toward
产生有效促进贵金属催化剂更典型的双电子还原转化(例如,氢化)的后第一行金属催化剂的新方法是一个重要目标。在这里,我们描述了结构上不寻常的 S = 1 双金属 Co 配合物 [((Cy)PBP)CoH]2 (1) 的合成,由双(膦基)硼基和双(膦基)氢化硼烷配体支持。该配合物与第二当量的 H2 (1 atm) 发生可逆反应,并在温和条件下(室温,1 atm H2)用作烯烃加氢催化剂。根据动力学研究,在催化的速率确定步骤中调用双金属 Co 物种。还制备了结构相关的 Ni(I)Ni(I) 二聚体 [((Ph)PBP)Ni]2 (3)。与 Co 催化剂 1 一样,Ni 配合物 3 显示出对 H2 的可逆反应性,得到双金属配合物 [((Ph)PBHP)NiH]2 (4)。这种可逆行为对于 Ni(I) 物种来说是前所未有的,这归因于硼基-Ni 键的存在。最后,制备了一系列单体 ((tBu)PBP)NiX