3‐(Methoxycarbonyl)Cyclobutenone as a Reactive Dienophile in Enantioselective Diels–Alder Reactions Catalyzed by Chiral Oxazaborolidinium Ions
作者:Peng Yan、Changxu Zhong、Jie Zhang、Yu Liu、Huayi Fang、Ping Lu
DOI:10.1002/anie.202014308
日期:2021.2.23
Cyclobutenone has been used as a highly reactivedienophile in Diels–Alder reactions, however, no enantioselective example has been reported. We disclose herein a chiral oxazaborolidine‐aluminum bromide catalyzed enantioselective Diels–Alder reaction of 3‐alkoxycarbonyl cyclobutenone with a variety of dienes. Furthermore, a total synthesis of (−)‐kingianin F was completed for the first time via enantioenriched
Copper-Catalyzed Asymmetric [3 + 2] Cycloaddition of N-2,2,2-Trifluoroethylisatin Ketimines to Access Three Classes of Polyfunctionalized Spiro-Pyrrolidine–Oxindole Motifs
作者:Wen-Feng Xu、Ren-Xu Xiao、Shuo Lv、Xing-Yue Li、Ming-Xing Lan、Xue-Qing Mou、Yun Zhang、Yong-Zheng Chen、Bao-Dong Cui
DOI:10.1021/acs.orglett.4c02631
日期:2024.9.6
A facile copper-catalyzed [3 + 2] cycloaddition of N-2,2,2-trifluoroethylisatin ketimines with various electron-deficientalkenes to access structurally polyfunctionalized spiro-pyrrolidine–oxindole motifs has been developed. Under the catalytic system, the N-2,2,2-trifluoroethylisatin ketimines could be utilized to react with a series of exocyclic alkenes, including 2-acylamino acrylates, 3-methylene-β-lactams
已经开发出一种简单的铜催化的N -2,2,2-三氟乙基靛酮亚胺与各种缺电子烯烃的 [3 + 2] 环加成反应,以获得结构上多官能化的螺吡咯烷-羟吲哚基序。在催化体系下, N -2,2,2-三氟乙基靛酮亚胺可与一系列环外烯烃反应,包括2-酰氨基丙烯酸酯、3-亚甲基-β-内酰胺以及以环丁烯酮为代表的位阻环烯烃,获得各种分别带有α-氨基酸酯、β-内酰胺和环丁酮的密集官能化螺环吡咯烷骨架,收率普遍良好,具有优异的非对映选择性和对映选择性。
VIDAL, JOELLE;HUET, FRANCOIS, J. ORG. CHEM., 53,(1988) N 3, 611-616