Journal
ORGANIC LETTERS
Volume 23, Issue 20, Pages 8104-8108Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c03243
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- Academia Sinica
- Ministry of Science and Technology (Taiwan) [105-2628-M-001-003-MY4, 109-2113-M-001-035-MY3]
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A new class of chiral tetrahydroselenophene-based compounds were synthesized and demonstrated to catalyze asymmetric cyclopropanation reactions with high enantioselectivities.
We report a new class of chiral tetrahydroselenophene based on (S)-diphenyl(tetrahydroselenophen-2-yl)methanol, which was prepared from (R)-3-(3-bromopropyl)-2,2-diphenyloxirane and sodium selenide. These chiral tetrahydroselenophene-based compounds were used to catalyze asymmetric cyclopropanation reactions; the selenonium ylide intermediates formed from these selenium-containing catalysts and benzyl bromide efficiently react with (E)-chalcones to give various cyclopropanes (27 examples) with excellent enantioselectivities of <= 99% ee and are the first examples of organoselenium-catalyzed asymmetric cyclopropanations.
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