Journal
ASIAN JOURNAL OF ORGANIC CHEMISTRY
Volume 11, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ajoc.202200399
Keywords
addition; allene; indoles; organocatalysis; propargylic alcohols
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Funding
- Natural Science Foundation of Shandong Province [ZR2021MB026]
- Special Funds of the Taishan Scholar Program of Shandong Province [tsqn201812047]
- Shenzhen Innovation of Science and Technology Commission [20200925151614002]
- Guangdong Innovative Program [2019BT02Y335]
- Guangdong Provincial Key Laboratory of Catalysis [2020B121201002]
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In this study, a chiral phosphoric acid-catalyzed 1,10-conjugate addition reaction was developed, enabling the organocatalytic asymmetric 3-allenylation of indoles. This approach provides a new method for the synthesis of axially chiral tetrasubstituted allenes.
A chiral phosphoric acids catalyzed regio- and enantioselective 1,10-conjugate addition of 2-arylindoles to alkynyl indole imine methides formed in situ from alpha-(6-indolyl)propargylic alcohols has been developed. With the established system, organocatalytic asymmetric 3-allenylation of indoles was realized, affording a broad scope of axially chiral tetrasubstituted allenes bearing two indole motifs in high yields with stereoselectivities. Importantly, the organocatalytic remote stereocontrolled strategy disclosed the asymmetric 3-allenylation of indoles via 1,10-conjugate addition for the first time.
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