METHOD FOR PRODUCING ALPHA-ACYLOXYCARBONYL COMPOUND AND NOVEL ALPHA-ACYLOXYCARBONYL COMPOUND
申请人:Ishihara Kazuaki
公开号:US20120323014A1
公开(公告)日:2012-12-20
A method for producing an α-acyloxycarbonyl compound of the present invention includes performing an intermolecular reaction between a carboxylic acid and a carbonyl compound selected from the group consisting of ketones, aldehydes, and esters, which have a hydrogen atom at the α-position, using a hydroperoxide as an oxidizer and an iodide salt as a catalyst precursor, thereby introducing an acyloxy group derived from the carboxylic acid into the α-position of the carbonyl compound.
In contrast to well‐established asymmetric hydrogenation reactions, enantioselective protonation is an orthogonal approach for creating highly valuable methine chiral centers under redox‐neutral conditions. Reported here is the highly enantio‐ and diastereoselective hydrofluorination of enals by an asymmetric β‐protonation/α‐fluorination cascade catalyzed by N‐heterocyclic carbenes (NHCs). The two
N-Heterocyclic Carbene-Catalyzed α,β-Unsaturated Aldehydes Umpolung in Fullerene Chemistry: Construction of [60]Fullerene-Fused Cyclopentan-1-ones and Cyclohex-2-en-1-ones
first umpolung strategy for the cycloacylation of fullerene using a N-heterocyclic carbene organocatalyst is reported. The coupling of [60]fullerene with different structural α,β-unsaturated aldehydes efficiently furnishes interesting [60]fullerene-fused cyclopentan-1-ones or cyclohex-2-en-1-ones in good to excellent yields. This newreaction displays a wide substrate scope and excellent functional-group
NHC-catalyzed oxidative γ-addition of α,β-unsaturated aldehydes to isatins: a high-efficiency synthesis of spirocyclic oxindole-dihydropyranones
作者:Rui Liu、Chenxia Yu、Zhaoxin Xiao、Tuanjie Li、Xiangshan Wang、Yuanwei Xie、Changsheng Yao
DOI:10.1039/c3ob42008f
日期:——
This manuscript discloses an efficient construction of the spirocyclic oxindole-dihydropyranone scaffold via the N-heterocyclic carbene (NHC)-catalyzed oxidative γ-functionalization of α,β-unsaturated aldehydes bearing γ-H with isatin derivatives. The ready availability of the starting materials, easy work-up, mild reaction conditions and the potential utilization value of the products make this strategy attractive.
Construction of an All-Carbon Quaternary Stereocenter by the Peptide-Catalyzed Asymmetric Michael Addition of Nitromethane to β-Disubstituted α,β-Unsaturated Aldehydes
作者:Kengo Akagawa、Kazuaki Kudo
DOI:10.1002/anie.201206916
日期:2012.12.14
Pepping up Michael: An asymmetricMichaeladdition of nitromethane to β‐disubstituted α,β‐unsaturated aldehydes was realized by a resin‐supported peptide catalyst. Whereas the use of a low‐molecular‐weight catalyst resulted in poor yields, the peptide effectively promoted the reaction in aqueous media with high enantioselectivity.