N-Heterocyclic Carbene-Catalyzed Synthesis of α-Trifluoromethyl Esters
摘要:
The N-heterocyclic carbene (NHC)-catalyzed trifluoromethylation of alpha-chloro aldehydes was developed, allowing straightforward access to valuable alpha-trifluoromethyl ester derivatives. The unique combination of an electrophilic trifluoromethylation reagent with NHC catalysis was the key for the functionalization of a broad range of alpha-chloro aldehydes, and the products are formed in moderate to good yields. Investigations of the enantioselective version of this reaction afforded the enantioenriched products in moderate yields with good ee values.
Lithium Aldol Reactions of α-Chloroaldehydes Provide Versatile Building Blocks for Natural Product Synthesis
作者:Robert Britton、Shira Halperin、Baldip Kang
DOI:10.1055/s-0030-1260032
日期:2011.6
The lithium aldol reaction of α-chloroaldehydes provides 1,2-anti-configured β-ketochlorohydrins. The scope of this reaction is demonstrated as well as its application to the synthesis of the C4-C15 segment of haterumalide NA.
ENANTIOSELECTIVE REACTIONS CATALYZED BY CHIRAL TRIAZOLIUM SALTS
申请人:Bode Jeffrey
公开号:US20100210452A1
公开(公告)日:2010-08-19
This invention provides a convenient method for converting imines and other electrophiles into heterocyclic ring systems. The process does not require the use of metallic reagents, and is catalyzed by an organic heterocyclic carbene catalyst. Accordingly, it produces the desired compounds without the concomitant production of a large volume of metallic waste. Chiral heterocyclic carbene catalysts of the invention and methods of using these catalysts produce chiral heterocycles in high enantiomeric and diastereomeric excess.
Enantioselective reactions catalyzed by chiral triazolium salts
申请人:Bode Jeffrey
公开号:US08501658B2
公开(公告)日:2013-08-06
This invention provides a convenient method for converting imines and other electrophiles into heterocyclic ring systems. The process does not require the use of metallic reagents, and is catalyzed by an organic heterocyclic carbene catalyst. Accordingly, it produces the desired compounds without the concomitant production of a large volume of metallic waste. Chiral heterocyclic carbene catalysts of the invention and methods of using these catalysts produce chiral heterocycles in high enantiomeric and diastereomeric excess.
N-Heterocyclic Carbene-Catalyzed Synthesis of α-Trifluoromethyl Esters
作者:Fabien Gelat、Atanu Patra、Xavier Pannecoucke、Akkattu T. Biju、Thomas Poisson、Tatiana Besset
DOI:10.1021/acs.orglett.8b01482
日期:2018.7.6
The N-heterocyclic carbene (NHC)-catalyzed trifluoromethylation of alpha-chloro aldehydes was developed, allowing straightforward access to valuable alpha-trifluoromethyl ester derivatives. The unique combination of an electrophilic trifluoromethylation reagent with NHC catalysis was the key for the functionalization of a broad range of alpha-chloro aldehydes, and the products are formed in moderate to good yields. Investigations of the enantioselective version of this reaction afforded the enantioenriched products in moderate yields with good ee values.
A tandem dearomatization/rearomatization strategy: enantioselective N-heterocyclic carbene-catalyzed α-arylation
作者:Zijun Wu、Jian Wang
DOI:10.1039/c8sc04601h
日期:——
the carbene-catalyzed tandem dearomatization/rearomatization reaction of azonaphthalenes with α-chloroaldehydes is described. This protocol enables the efficient assembly of chiral dihydrocinnolinone derivatives in good yields with excellent enantioselectivities (up to 99% ee). Moreover, this strategy enables not only the highlyenantioselective NHC-catalyzed nucleophilic aromatic substitution, but also