β-(Carbonatoxy)alkyl radicals: a new subset of β-(ester)alkyl radical fragmentation during copper(I)-mediated synthesis of 1,1-dichloro-1-alkenes
作者:Ram N. Ram、Ram K. Tittal
DOI:10.1016/j.tetlet.2014.05.097
日期:2014.7
A new subset of β-(ester)alkyl radicals is presented. It is the first study on the chemistry of β-(alkoxycarbonyloxy)alkyl radicals that fill the gap in the spectrum of the migrating groups in β-(ester)alkyl radical reactions. The change from less nucleofugal (acetate) group to the more nucleofugal (carbonate) group in the spectrum of the migrating group changed the reaction path from rearrangement
Efficient Multigram Approach to Acetylenes and CF
<sub>3</sub>
‐ynones Starting from Dichloroalkenes Prepared by Catalytic Olefination Reaction (COR)
作者:Vasiliy M. Muzalevskiy、Zoia A. Sizova、Arstan I. Diusenov、Alexey V. Shastin、Valentine G. Nenajdenko
DOI:10.1002/ejoc.202000531
日期:2020.7.23
Efficient two step approach towards terminal acetylenes was elaborated. At the first step, dichloroalkenes were prepared in up to 88 % yields by catalytic olefination reaction COR of arylaldehydes. Treatment of dichloroalkenes with n BuLi effectively led to the corresponding alkynes in up to 97 % yield. A versatile one pot procedure towards CF3‐ynones was elaborated to give these products in up to
Organometalliques portant une fonction eliminable en β
作者:Jean Villieras、Cathy Bacquet、Jean F. Normant
DOI:10.1016/s0022-328x(00)89303-1
日期:1975.9
warming, either by α-elimination of ClLi or β-elimination of ROLi. β-Elimination is generally observed and leads to the formation of a dichloroalkene which reacts with excess of butyllithium (or lithiumdialkylamide) to give the corresponding mono-substituted alkyne (or chloroalkyne) with good yields. α-Elimination is followed by the migration of a group from the alcoholic carbon to the carbenoid center;
Organometal-Free Arylation and Arylation/Trifluoroacetylation of Quinolines by Their Reaction with CF<sub>3</sub>-ynones and Base-Induced Rearrangement
作者:Vasiliy M. Muzalevskiy、Kseniya V. Belyaeva、Boris A. Trofimov、Valentine G. Nenajdenko
DOI:10.1021/acs.joc.0c01277
日期:2020.8.7
The reaction of quinolines with CF3-ynones resulted in the formation of 1,3-oxazinoquinolines. Subsequent treatment of the reaction mixture with a base initiated deep structural transformation of primary products. Both steps proceed in very high yield. As a result, unusual rearrangement of 1,3-oxazinoquinolines to form either 2-arylquinolines or 2-aryl-3-trifluoroacetylquinolines was discovered. The
A Chiral Naphthyridine Diimine Ligand Enables Nickel‐Catalyzed Asymmetric Alkylidenecyclopropanations
作者:Elena Braconi、Nicolai Cramer
DOI:10.1002/anie.202006082
日期:2020.9.14
A novel class of chiral naphthyridine diimine ligands (NDI*) readily accessible from C2‐symmetric 2,6‐di‐(1‐arylethyl)anilines is described. The utility of these ligands, particularly one with fluorinated aryl side arms, is demonstrated by a reductive Ni‐catalyzed enantioselective alkylidene transfer reaction from 1,1‐dichloroalkenes to olefins. This transformation provides direct access to a broad