Premium
Regioselective and Enantioselective Synthesis of β‐Indolyl Cyclopentenamides by Chiral Anion Catalysis
Author(s) -
Rajkumar Subramani,
Wang Jiawen,
Zheng Sujuan,
Wang Donglei,
Ye Xueqian,
Li Xuejiao,
Peng Qian,
Yang Xiaoyu
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201807010
Subject(s) - iminium , enantioselective synthesis , regioselectivity , chemistry , isomerization , organocatalysis , catalysis , ketone , phosphoric acid , diastereomer , combinatorial chemistry , organic chemistry
The regioselective and enantioselective synthesis of β‐indolyl cyclopentenamides, a versatile chiral building block, by asymmetric addition of indoles to α,β‐unsaturated iminium intermediates has been achieved through chiral anion catalysis. Key to the success of this methodology is the generation of a chiral anion‐paired ketone‐type α,β‐unsaturated iminium intermediate from α‐hydroxy enamides. Preliminary mechanistic studies and DFT calculations are consistent with a mechanism involving multiple, concurrent pathways for isomerization of the initially formed azaallylcation into the key α,β‐unsaturated iminium intermediate, all mediated by the phosphoric acid catalyst.