Journal
ACS CATALYSIS
Volume 12, Issue 23, Pages 14748-14753Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c03777
Keywords
alkyne activation; cyclopropene; carbene; 1; 4-ketoaldehydes; amine; Rh(II) bicatalytic system
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Funding
- National Natural Science Foundation of China [21971112]
- Starting Funding of Research from Guizhou University
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In this study, we describe an efficient amine/Rh(II) dual catalytic system that enables the reassembly of conjugated alkynes with cyclopropenes, resulting in the construction of alpha-vinyldicarbonyl derivatives under mild reaction conditions. This cascade platform offers high atom and step economies, and is compatible with a broad range of substrates including complex natural and unnatural molecules for late-stage functionalization.
Amines are powerful organocatalysts that are well-documented in catalyzing carbonyl compounds to realize trans-formations. However, they are rarely applied in alkyne activations. Herein, we disclose an efficient amine/Rh(II) dual catalytic system to reassemble the CC bond of conjugated alkynes with cyclopropenes, which enables construction of alpha-vinyldicarbonyl derivatives under very mild reaction conditions. Vinyl cyclopropylamines might be involved as key intermediates through ring-opening of cyclopropenes, catalytic amination of alkynes, and tandem cyclopropantion sequences in high atom and step-economies. This formal cutting/insertion cascade platform is compatible with a broad substrate scope including complex natural and unnatural molecules for late-stage functionalization.
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