From C
1
to C
3
: Copper‐Catalyzed
gem
‐Bis(trifluoromethyl)olefination of α‐Diazo Esters with TMSCF
3
摘要:
AbstractA Cu‐catalyzed gem‐bis(trifluoromethyl)olefination of α‐diazo esters, using TMSCF3 as the only fluorocarbon source, has been developed and provides an exquisite method to access gem‐bis(trifluoromethyl)alkenes. This unprecedented olefination process involves a carbene migratory insertion into “CuCF3” to generate the α‐CF3‐substituted organocopper species, which then undergoes β‐fluoride elimination and two consecutive addition‐elimination processes to give the desired products. The key to this efficient one‐pot C1‐to‐C3 synthetic protocol lies in the controllable double (over single and triple) trifluoromethylations of the gem‐difluoroalkene intermediates.
Michael-initiated ring closure of aryldiazoacetates and α-substituted acroleins under acid catalysis offers a unique opportunity for the stereoselective formation of various tetrasubstituted cyclopropanes.
Cu(I)/Chiral Bisoxazoline‐Catalyzed Enantioselective Doyle‐Kirmse Reaction of Allenyl Sulfides with
<i>α</i>
‐Diazoesters
作者:Kang Wang、Shu‐Sen Li、Jianbo Wang
DOI:10.1002/chem.202200170
日期:2022.4.12
A Cu(I)/chiral bisoxazoline-catalyzed enantioselective Doyle-Kirmse reaction of polyfluoroaryl allenylsulfides with α-diazoesters, generating chiral tertiary homopropargylic sulfides in good enantioselectivities under mild conditions.
Asymmetric [3 + 1]-Cycloaddition Reaction via Diazo Discrimination
作者:Yong Xu、Zhen Wang、Jiangtao Sun
DOI:10.1021/acs.orglett.1c02825
日期:2021.10.1
1]-cycloaddition of two structurally different diazo compounds has been achieved using chiral bisoxazoline copper(I) complexes as a catalyst, providing a novel route for the synthesis of cyclobutenes containing a quaternary stereocenter. Typically, this reaction represents the first example of asymmetric cross-electrophile coupling of two diazo substrates via carbene discrimination.
Catalytic Asymmetric Syntheses of Alkylidenecyclopropanes from Allenoates with Donor‐Acceptor and Diacceptor Diazo Reagents
作者:Yoko Hasegawa、Thomas Cantin、Jonathan Decaens、Samuel Couve‐Bonnaire、André B. Charette、Thomas Poisson、Philippe Jubault
DOI:10.1002/chem.202201438
日期:2022.8.22
Chiral ACPs: The catalytic asymmetric synthesis of alkylidenecyclopropanes from electron-deficient allenes is described. The methodology, using donor-acceptor or diacceptor diazo reagents, catalyzed by a chiral rhodium complex furnished the corresponding ACPs in high yields with excellent diastereo- and enantioselectivities.
Rhodium-Catalyzed Formal C═O Bond Insertion and Sequential Acyl 1,4-N-to-O Migratory Rearrangement
作者:Qiongya Li、Chunlan He、Jiahui Su、Ying Shao、Shengbiao Tang、Jiangtao Sun
DOI:10.1021/acs.joc.2c02328
日期:2022.12.16
reaction between N-acyl pyridazinones and diazoacetates, leading to pyridazine derivatives in good yield under mild reaction conditions. This whole sequence probably proceeds through a carbene insertion into a C═O bond and an unprecedented 1,4-N-to-O acyl rearrangement reaction.