Here, we present a well-defined structure–activityrelationshipstudy, which rationalizes the unique features of the SirReals and probes the limits of modifications on this scaffold regarding inhibitor potency. Moreover, we present a crystal structure of hSirt2 in complex with an optimized SirReal derivative that exhibits an improved in vitro activity. Lastly, we show cellular hyperacetylation of the
metal-free access to 3,6-disubstituted α-pyrones from α-chloro aldehydes and β-tosyl enones is reported. The reactions proceed via the Michael addition/lactonization/elimination cascade. The regioselective addition of NHC-bound enolates/homoenolates to the enones bearing a bulkier functionality such as tosyl group at the β-position has remained challenging. The 3,6-disubstituted α-pyrones could be converted
Carbene and Acid Cooperative Catalytic Reactions of Aldehydes and <i>o</i>-Hydroxybenzhydryl Amines for Highly Enantioselective Access to Dihydrocoumarins
作者:Xingkuan Chen、Runjiang Song、Yingguo Liu、Chong Yih Ooi、Zhichao Jin、Tingshun Zhu、Hongling Wang、Lin Hao、Yonggui Robin Chi
DOI:10.1021/acs.orglett.7b02883
日期:2017.11.3
A highly enantioselective method for quick access to dihydrocoumarins is reported. The reaction involves a cooperative catalytic process with carbene and in situ generated Brønsted acid as the catalysts. α-Chloro aldehyde and readily available and stable o-hydroxybenzhydryl amine substrates were used to generate reactive azolium ester enolate and ortho-quinone methide (o-QM) intermediates, respectively
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
Asymmetric Synthesis of Structurally Sophisticated Spirocyclic Pyrano[2,3-<i>c</i>]pyrazole Derivatives Bearing a Chiral Quaternary Carbon Center
作者:Xiaoqun Yang、Jun Sun、Xuan Huang、Zhichao Jin
DOI:10.1021/acs.orglett.2c02211
日期:2022.7.29
A carbene-catalyzed enantio- and diastereoselective [2 + 4] cycloaddition reaction is developed for quick and efficient access to structurally complex multicyclic pyrano[2,3-c]pyrazole molecules. The reaction tolerates a broad scope of substrates bearing various substitution patterns, with the multicyclic pyrano[2,3-c]pyrazole products afforded in generally good to excellent yields and optical purities
开发了一种卡宾催化的对映选择性和非对映选择性 [2 + 4] 环加成反应,用于快速有效地获得结构复杂的多环吡喃并 [2,3- c ] 吡唑分子。该反应可以耐受具有各种取代模式的广泛底物,多环吡喃并[2,3- c ]吡唑产物的产率和光学纯度一般都很好。从这种方法获得的手性分子在开发用于植物保护的新型杀菌剂方面具有广阔的应用前景。