Enantioselective [3+3] atroposelective annulation catalyzed by N-heterocyclic carbenes

Changgui Zhao, Donghui Guo, Kristin Munkerup, Kuo-Wei Huang, Fangyi Li and Jian Wang ()
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Changgui Zhao: Tsinghua University Beijing
Donghui Guo: Tsinghua University Beijing
Kristin Munkerup: King Abdullah University of Science and Technology
Kuo-Wei Huang: King Abdullah University of Science and Technology
Fangyi Li: Tsinghua University Beijing
Jian Wang: Tsinghua University Beijing

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Axially chiral molecules are among the most valuable substrates in organic synthesis. They are typically used as chiral ligands or catalysts in asymmetric reactions. Recent progress for the construction of these chiral molecules is mainly focused on the transition-metal-catalyzed transformations. Here, we report the enantioselective NHC-catalyzed (NHC: N-heterocyclic carbenes) atroposelective annulation of cyclic 1,3-diones with ynals. In the presence of NHC precatalyst, base, Lewis acid and oxidant, a catalytic C–C bond formation occurs, providing axially chiral α-pyrone−aryls in moderate to good yields and with high enantioselectivities. Control experiments indicated that alkynyl acyl azoliums, acting as active intermediates, are employed to atroposelectively assemble chiral biaryls and such a methodology may be creatively applied to other useful NHC-catalyzed asymmetric transformations.

Date: 2018
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DOI: 10.1038/s41467-018-02952-3

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