[EN] AFMT ANALOGS AND THEIR USE IN METHODS OF TREATING PARKINSON'S DISEASE [FR] ANALOGUES DE L'AFMT ET LEUR UTILISATION DANS DES MÉTHODES DE TRAITEMENT DE LA MALADIE DE PARKINSON
Asymmetric alkynylation of thiazolones and azlactones with alkynylbenziodoxolones as the electrophilic alkyne source catalyzed by thiourea phosphonium salt is described. By using thiazolones as nucleophiles, the desired alkyne functionalized thiazolones were obtained in 55–89% yields with 31–86% ee. Azlactones gave the desired products in comparable yields with lower enantioselectivities. Ring-opening
描述了硫脲鏻盐催化的噻唑酮和吖内酯的不对称炔基化反应,其中炔基苯并氧唑酮作为亲电炔烃源。通过使用噻唑酮作为亲核试剂,以 55-89% 的产率和 31-86% 的 ee 获得所需的炔烃官能化噻唑酮。Azlactones 以较低的对映选择性以相当的产率得到所需的产物。炔基化产物的开环导致α,α-二取代的α-氨基酸衍生物有效而不会损失对映选择性。
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
Enantioselective Addition of Azlactones to Ethylene Sulfonyl Fluoride via Dual Catalysis
作者:Dong-yu Zhu、Xue-jing Zhang、Ming Yan
DOI:10.1021/acs.orglett.1c01193
日期:2021.6.4
Enantioselective conjugate addition of azlactones to ethylene sulfonyl fluoride has been achieved via the cooperative catalysis with (DHQD)2PHAL and a hydrogen-bond donor (HBD). This approach furnishes a facile access to a range of structurally diverse azlactone sulfonyl fluoride derivatives with good to excellent yields and enantioselectivities. The combination of azlactone and sulfonyl fluoride group
Dynamic Kinetic Resolution of Azlactones by a Chiral <i>N</i>,<i>N</i>-Dimethyl-4-aminopyridine Derivative Containing a 1,1′-Binaphthyl Unit: Importance of Amide Groups
作者:Hiroki Mandai、Kohei Hongo、Takuma Fujiwara、Kazuki Fujii、Koichi Mitsudo、Seiji Suga
DOI:10.1021/acs.orglett.8b01960
日期:2018.8.17
resolution (DKR) of azlactones in the presence of benzoic acid and a binaphthyl-based N,N-4-dimethylaminopyridine (DMAP) derivative 1i having two amide groups at the 3,3′-positions of a binaphthyl unit is developed. The reaction proceeded smoothly with a wide range of azlactones to provide α-amino acid derivatives with good to high enantiomeric ratios (er’s). A multigram-scale reaction (2.5 g) for the
Asymmetric Difluoromethylthiolation of Carbon Nucleophiles with Optically Pure Difluoromethylthiolating Reagents Derived from Camphorsultam
作者:He Zhang、Xiaolong Wan、Qilong Shen
DOI:10.1002/cjoc.201900298
日期:2019.10
The invention of a family of optically pure electrophilic difluoromethylthiolating reagents 9a–c based on the camphorsultam skeleton was described. These reagents reacted with a variety of soft carbonnucleophiles such as oxazolone, oxindole, benzolactone and β‐ketoester in good to excellent enantioselectivities.