Synthesis of allylic amide functionalized 2H-chromenes and coumarins using a one-pot Overman rearrangement and gold(I)-catalyzed hydroarylation
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OA Location
Author(s)
Shard, Salaheddin AI
Calder, Ewen DD
Harkiss, Alexander H
Maduro, Marie
Sutherland, Andrew
Type
Journal Article
Abstract
A four-step synthesis of allylic trichloroacetimidates bearing a 2-proparyloxyaryl group has been developed from readily available 2-hydroxybenzaldehydes, and these have been used for the preparation of allylic amide derived 2H-chromenes using an Overman rearrangement and a 6-endo-dig hydroarylation. High yields of the 2H-chromenes were achieved using a stepwise approach involving an Overman rearrangement under thermal conditions followed by a hydroarylation reaction with a gold(I) triflimide catalyst. An alternative method where both reactions were performed as a one-pot process was also developed and instead used a gold(I) chloride catalyst activated by silver(I) hexafluoroantimonate for the cycloisomerization step. The allylic amide derived 2H-chromenes were converted to the corresponding coumarin analogues by a pyridinium dichromate (PDC)-mediated chemoselective allylic oxidation.
Date Issued
2016-10-21
Date Acceptance
2016-10-01
Citation
Journal of Organic Chemistry, 2016, 81 (20), pp.9810-9819
ISSN
0022-3263
Publisher
American Chemical Society
Start Page
9810
End Page
9819
Journal / Book Title
Journal of Organic Chemistry
Volume
81
Issue
20
Copyright Statement
© 2016 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY)License, which permits unrestricted use, distribution and reproduction in any medium,provided the author and source are cited.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000386187500030&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Chemistry, Organic
Chemistry
POLYCYCLIC SCAFFOLDS
TANDEM PROCESS
DERIVATIVES
CYCLIZATION
COMPLEXES
1,2-DIHYDROQUINOLINES
FLUORESCENCE
CHROMENES
MECHANISM
ACCESS
Publication Status
Published
Date Publish Online
2016-10-06