期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 145, 期 29, 页码 16238-16248出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.3c05258
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A new method for the asymmetric C-H amidation of dioxazolones using a Cu(I) precursor with a chiral bisoxazoline ligand has been developed, allowing the synthesis of six-membered lactams with high selectivity (up to >19:1 rr and >99:1 er). Mechanistic studies suggest that the regioselective hydrogen atom abstraction and subsequent enantio-determining radical rebound of the resulting carbon radical intermediates are enabled by the open-shell character of the postulated Cu-nitrenoids. This asymmetric cyclization has demonstrated its synthetic utility in the diastereoselective introduction of additional functional groups into the chiral lactam skeleton and the rapid access to biorelevant azacyclic compounds.
Controlling regio- and enantioselectivity in C-Hfunctionalizationreactions is of paramount importance due to their versatile syntheticutilities. Herein, we describe a new approach for the asymmetric & delta;-C(sp(3))-H amidation catalysis of dioxazolones using a Cu(I)precursor with a chiral bisoxazoline ligand to access six-memberedlactams with high to excellent regio- and enantioselectivity (up to>19:1 rr and >99:1 er). Combined experimental and computationalmechanisticstudies unveiled that the open-shell character of the postulated Cu-nitrenoidsenables the regioselective hydrogen atom abstraction and subsequentenantio-determining radical rebound of the resulting carbon radicalintermediates. The synthetic utility of this asymmetric cyclizationwas demonstrated in the diastereoselective introduction of additionalfunctional groups into the chiral & delta;-lactam skeleton as wellas in the rapid access to biorelevant azacyclic compounds.
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