Chiral Brønsted acid-controlled intermolecular asymmetric [2 + 2] photocycloadditions

Evan M. Sherbrook, Matthew J. Genzink, Bohyun Park, Ilia A. Guzei, Mu-Hyun Baik () and Tehshik P. Yoon ()
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Evan M. Sherbrook: University of Wisconsin–Madison
Matthew J. Genzink: University of Wisconsin–Madison
Bohyun Park: Korea Advanced Institute of Science and Technology (KAIST)
Ilia A. Guzei: University of Wisconsin–Madison
Mu-Hyun Baik: Korea Advanced Institute of Science and Technology (KAIST)
Tehshik P. Yoon: University of Wisconsin–Madison

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Control over the stereochemistry of excited-state photoreactions remains a significant challenge in organic synthesis. Recently, it has become recognized that the photophysical properties of simple organic substrates can be altered upon coordination to Lewis acid catalysts, and that these changes can be exploited in the design of highly enantioselective catalytic photoreactions. Chromophore activation strategies, wherein simple organic substrates are activated towards photoexcitation upon binding to a Lewis acid catalyst, rank among the most successful asymmetric photoreactions. Herein, we show that chiral Brønsted acids can also catalyze asymmetric excited-state photoreactions by chromophore activation. This principle is demonstrated in the context of a highly enantio- and diastereoselective [2+2] photocycloaddition catalyzed by a chiral phosphoramide organocatalyst. Notably, the cyclobutane products arising from this method feature a trans-cis stereochemistry that is complementary to other enantioselective catalytic [2+2] photocycloadditions reported to date.

Date: 2021
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DOI: 10.1038/s41467-021-25878-9

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