Construction of Acyclic Quaternary Stereocenters via Mannich-Type Addition of α,α-Disubstituted <i>N</i>-<i>tert</i>-Butanesulfinyl Ketimines to Isatin-Derived Ketimines
作者:Zheng-Fei Li、Chong-Lin Zhu、Yun Zhang、Yun Yao、Chong-Dao Lu
DOI:10.1021/acs.orglett.2c00888
日期:2022.4.22
deprotonated, highly enantioenriched α,α-disubstituted N-tert-butanesulfinyl ketimines with isatin-derived ketimines was developed to prepare 3-amino-3-substituted oxindoles bearing an acyclic quaternary stereogenic carbon substituted with two sterically similar groups. The excellent stereocontrol of the deprotonation enabled the formation of metalloenamine intermediates with stereodefined geometry, while
Chiral Phosphoric Acid-Catalyzed Enantioselective Aza-Friedel–Crafts Addition of Naphthols with Isatin-Derived Ketimines
作者:Mei Duan、Jingchao Chen、Ting Wang、Shaojian Luo、Meifen Wang、Baomin Fan
DOI:10.1021/acs.joc.2c01659
日期:2022.11.18
The enantioselective Friedel–Crafts addition of naphthols with isatin-derived ketimines was developed with H8-BINOL-derived chiral biaryl phosphoric acid. A wide range of isatin-derived ketimines and naphthols were successfully applied and gave a series of chiral 3-amino-2-oxindoles in excellent yields with high optical purities.
萘酚与靛红衍生的酮亚胺的对映选择性 Friedel-Crafts 加成是用 H 8 -BINOL 衍生的手性联芳基磷酸开发的。广泛的靛红衍生物酮亚胺和萘酚被成功应用,并以优异的产率和高光学纯度得到一系列手性 3-氨基-2-羟吲哚。