Stereoselective Substitution of Configurationally Labile α-Bromo Arylacetates with Amines and Azlactones by<scp>L</scp>-Threonine-Mediated Crystallization-Induced Dynamic Resolution
作者:Yun Soo Choi、SeHee Park、Yong Sun Park
DOI:10.1002/ejoc.201600201
日期:2016.5
We developed a highly stereoselective C–N and C–C bond-forming reaction by carrying out a crystallization-induceddynamicresolution (CIDR) of α-bromoarylacetates followed by a stereoselective substitution reaction with an amine or azlactone nucleophile. Applications of this synthetic method to the preparation of highly enantioenriched nitrogen-containing six-membered heterocycles and α,β-disubstituted
Asymmetric synthesis of 4-aryl dihydroisoquinolin-3-ones and 2-aryl morpholin-3-ones using AgOTf-activated α-bromo arylacetate
作者:Su Kyung Hong、Wongi Park、Yong Sun Park
DOI:10.1016/j.tet.2019.130841
日期:2020.1
A novel asymmetric synthetic strategy to prepare 4-aryl-dihydroisoquinolinones has been developed through a highly regioselective Friedel-Crafts alkylation of benzylamine derivatives with (αR)-α-bromo arylacetates and subsequent facile lactamization. In addition, an efficient asymmetric synthesis of 2-aryl morpholinones is demonstrated with 2-aminoethanol derivatives using the same convenient subs
Neutral Alcohol Nucleophiles for the Substitution of α-Bromo Aryl Acetates and Applications to Asymmetric Synthesis of Morpholine Derivatives
作者:Wongi Park、Yongtae Kim、Yong Sun Park
DOI:10.1002/ejoc.201900207
日期:2019.4.24
Highly stereoselective C–O bond formation in AgOTf‐catalyzed substitution of α‐bromo aryl acetates with neutral alcohol nucleophiles is developed and applied to the preparation of highly enantioenriched 2‐aryl‐morpholine derivatives.
An access to highly enantioenriched <i>cis</i>-3,5-disubstituted γ-lactones from α-bromoacetate and silyl enol ether
作者:Ha Rim Lee、Seo Yun Kim、Min Ji Park、Yong Sun Park
DOI:10.1039/d1ob01403j
日期:——
highly enantioenriched cis-3,5-disubstituted γ-lactones has been developed by the AgOTf-promoted nucleophilic substitution of α-bromoacetates with silyl enol ethers and subsequent reductive lactonization. The utility of this synthetic method was further demonstrated through the concise stereodivergent synthesis of cis- and trans-2,4-disubstituted tetrahydrofurans.
Divergent Reactions of
<scp>2‐Aminophenol</scp>
with
<scp>α‐Bromoacetate</scp>
: Asymmetric Synthesis of Two Regioisomeric 1,
<scp>4‐Benzoxazinones</scp>
作者:Seo Yun Kim、Gun Hee Han、Su Kyung Hong、Jieun Park、Yong Sun Park
DOI:10.1002/bkcs.12165
日期:2021.2
2‐Aminophenol displays a diverse pattern of reactivity in the substitution reaction of α‐bromoacetate. The substitution under neutral or basic conditions results in the formation of 1,4‐benzoxazinones, whereas Lewis acid‐promoted substitution leads to Friedel–Crafts alkylation of 2‐aminophenol. Asymmetric synthesis of two regioisomeric 1,4‐benzoxazinones is accomplished from the nucleophilic substitution