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Ynamide Carbopalladation: A Flexible Route to Mono‐, Bi‐ and Tricyclic Azacycles
Author(s) -
Campbell Craig D.,
Greenaway Rebecca L.,
Holton Oliver T.,
Walker P. Ross,
Chapman Helen A.,
Russell C. Adam,
Carr Greg,
Thomson Amber L.,
Anderson Edward A.
Publication year - 2015
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.201501710
Subject(s) - intramolecular force , regioselectivity , chemistry , cascade , ring (chemistry) , combinatorial chemistry , coupling (piping) , stereochemistry , organic chemistry , catalysis , materials science , chromatography , metallurgy
Bromoenynamides represent precursors to a diversity of azacycles by a cascade sequence of carbopalladation followed by cross‐coupling/electrocyclization, or reduction processes. Full details of our investigations into intramolecular ynamide carbopalladation are disclosed, which include the first examples of carbopalladation/cross‐coupling reactions using potassium organotrifluoroborate salts; and an understanding of factors influencing the success of these processes, including ring size, and the nature of the coupling partner. Additional mechanistic observations are reported, such as the isolation of triene intermediates for electrocyclization. A variety of hetero‐Diels–Alder reactions using the product heterocycles are also described, which provide insight into Diels–Alder regioselectivity.