Iron<sup>III</sup>-catalyzed asymmetric inverse-electron-demand hetero-Diels–Alder reaction of dioxopyrrolidines with simple olefins
作者:Tangyu Zhan、Liang Zhou、Yuqiao Zhou、Bingqian Yang、Xiaoming Feng、Xiaohua Liu
DOI:10.1039/d4sc00078a
日期:——
hetero-Diels–Alder reaction of dioxopyrrolidines with a variety of simple olefins has been accomplished, significantly expanding the applicability of this cyclization to both cyclic hetero-dienes and dienophiles. A new type of strong Lewis acid catalyst of ferric salt enables the LUMO activation of dioxopyrrolidines via formation of cationic species, this method yields a range of bicyclic dihydropyran derivatives
Cyclohexyl-Fused, Spirobiindane-Derived, Phosphine-Catalyzed Synthesis of Tricyclic γ-Lactams and Kinetic Resolution of γ-Substituted Allenoates
作者:Mingyue Wu、Zhaobin Han、Kaizhi Li、Ji’en Wu、Kuiling Ding、Yixin Lu
DOI:10.1021/jacs.9b07418
日期:2019.10.16
A C-2-symmetric chiral phosphine catalyst, NUSIOC-Phos, which can be easily derived from cyclohexyl-fused spirobiindane, was introduced. A highly enantioselective domino process involving pyrrolidine-2,3-diones and gamma-substituted allenoates catalyzed by NUSIOC-Phos has been disclosed. Diastereospecific tricyclic gamma-lactams containing five contiguous stereogenic centers were obtained in high yields and with nearly perfect enantioselectivities. A kinetic resolution process of racemic gamma-substituted allenoates was developed for the generation of optically enriched chiral allenoates.