intermediates under mild reaction conditions has been an important challenge with attractive prospective in organicsynthesis. In this work, we show the efficient combination of an electrophilic iron catalyst with a lithium Lewisacid for the functionalization of strong Csp3−H bonds of cyclic and linear alkanes by the activation of commercially available ethyl diazoacetate (EDA). The reaction proceeds with good
Organomanganese (II) reagents XXII. Copper-catalyzed conjugate addition of organomanganese reagents to α, β-ethylenic esters.
作者:Gérard Cahiez、Mouad Alami
DOI:10.1016/s0040-4039(00)88505-6
日期:1990.1
Copper-catalyzed conjugate addition of organomanganese reagents to α, β ethylenic esters easily takes place in THF at 0 °C, in the presence of 3% CuCl and Me3SiCl. Good to moderate yields are obtained from organomanganese reagents prepared from organolithium or organomagnesium compounds.
Copper-catalyzed conjugate addition of organomagnesium reagents to α,β-ethylenic esters: A simple high yield procedure.
作者:Gérard Cahiez、Mouad Alami
DOI:10.1016/s0040-4039(00)88506-8
日期:1990.1
The conjugate addition of organomagnesium reagents to α, β-ethylenic esters is performed in THF, at room temperature (30 min to 1.5 h), in the presence of CuCl (3%) and Me3SiCl (1.2 eq.). Good yields of 1,4-addition products are obtained according to this very simple procedure.
Pd(II)-catalyzed site-selective β- and γ-C(sp3)–Harylation of primary aldehydes is developed by rational design of L,X-type transient directing groups (TDG). External 2-pyridone ligands are identified to be crucial for the observed reactivity. By minimizing the loading of acid additives, the ligand effect is enhanced to achieve high reactivities of the challenging primary aldehyde substrates. Site