Reactivity of mixed organozinc and mixed organocopper reagents: 10 Comparison of the transferability of the same group in acylation of mixed and homo halozinc diorganocuprates with benzoyl chloride. A kinetic study
作者:Özgen Ömür Pekel、Ender Erdik
DOI:10.1016/j.jorganchem.2013.10.030
日期:2014.2
din-butylcuprate, n-Bu2CuZnI with benzoyl chloride in THF at 15–(−15)°C. Thirdorderreaction was found which is first order in benzoyl chloride and second order in cuprate. We offered a reaction mechanism for the acylation of halozinc diorganocuprates depending on the kinetic data and activation parameters. Lower reaction rate of transferable group, n-Bu in mixed cuprate, n-Bu(PhCuZnI than that of
详细的动力学研究已经进行了用于iodozinc酰化Ñ丁基(取代苯基)铜酸盐,Ñ -Bu(FG-C 6 H ^ 4)CuZnI和iodozinc二Ñ -butylcuprate,Ñ -Bu 2 CuZnI与苯甲酰氯在THF在15-(-15)℃下。发现三级反应,第一级在苯甲酰氯中,第二级在铜酸盐中。我们根据动力学数据和活化参数提供了卤化二有机铜卤代锌酰化的反应机理。转移的基团的反应速率较低,Ñ -Bu混合铜酸盐,正丁基(PhCuZnI比homocuprate的,Ñ -Bu 2CuZnI和Hammett在n -Bu(FG-C 6 H 4)CuZnI试剂中可转移基团n -Bu的反应速率与残基FG-C 6 H 4的取代基常数具有正反应常数(相对FG的反应性:4-Br> 3-MeO> H> -3-Me> 4-Me> 4-MeO)与所提出的机理一致。这些发现支持了我们的假设,即可转移基团的反应速率R T取决于混合铜酸盐中残留基团R
Enantioselective conjugate addition to cyclic enones with scalemic lithium organo(amido)cuprates, Part IV. Relationship between ligand structure and enantioselectivity
作者:Bryant E. Rossiter、Masakatsu Eguchi、Guobin Miao、Nicole M. Swingle、Amelia E. Hernández、Denise Vickers、Ezdan Fluckiger、R. Greg Patterson、K. Vásavi Reddy
DOI:10.1016/s0040-4020(01)86278-5
日期:1993.1
Scalemic lithium amides derived from primary and secondary amines react with organocopper compounds in ether or dimethyl sulfide to form lithium organo(amido)cuprates capable of enantioselective conjugate addition to 2-cycloalkenones. The most successful heterocuprate, in which the chiral ligand is (S)-N-methyl-1-phenyl-2-(1-piperidinyl)ethanamine, (S)-MAPP, 13, reacts with cyclic enones to form products
A copper(I)‐catalyzed addition of alkylborane reagents to α‐iminoacetates has been developed to assemble both acyclic and cyclic α‐branched α‐amino carboxylic acid derivatives in good yields. A wide variety of unactivated alkenes are well tolerated in this transformation.
Reductive Alkylation of Tertiary Lactams via Addition of Organocopper (RCu) Reagents to Thioiminium Ions
作者:Pierre Mateo、Joséphine E. Cinqualbre、Melinda Meyer Mojzes、Kurt Schenk、Philippe Renaud
DOI:10.1021/acs.joc.7b02150
日期:2017.12.1
A simple procedure for the conversion of tertiary lactams to 2-monoalkylated cyclic amines is described. The reaction sequence involves conversion of a lactam to a thioiminium ion followed by reaction with an organocopper (RCu) reagent and final reduction with triacetoxyborohydride. The reaction is high yielding and shows an excellent functional group tolerance. Its utility is demonstrated by a rapid
The current state-of-the-art synthesis for the formation of enantiomerically enriched all-carbon quaternary stereocenters in acyclic system relies on the formation of a single carbon-carbon bond per chemical step by asymmetric catalysis. These extraordinary sophisticated methods were logically classified among the most powerful and innovative ones. In this concept article, we are proposing a new retrosynthetic