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Copper Bis(oxazoline)‐Catalyzed Enantioselective Alkynylation of Benzopyrylium Ions
Author(s) -
Guan Yong,
Attard Jonathan W.,
Mattson Anita E.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904822
Subject(s) - oxazoline , stereocenter , alkynylation , enantioselective synthesis , chemistry , catalysis , copper , ether , combinatorial chemistry , stereochemistry , organic chemistry
The stereocontrolled construction of biologically relevant chromanones and tetrahydroxanthones has been achieved through the addition of alkynes to benzopyrylium trilfates under the influence of copper bis(oxazoline) catalysis. Excellent levels of enantiocontrol (63–98 % ee ) are achieved in the addition of a variety of alkynes to an array of chromenones with a hydrogen in the 2‐position. Promising levels of enantiocontrol (54–67 % ee ) are achieved in the alkynylation of chromenones with esters in the 2‐position, generating tertiary ether stereocenters resembling those frequently found in naturally occurring metabolites.