A catalytic asymmetric aldol reaction directly employing amides as latent enolates has remained elusive because of the resistance of amides to enolization. A direct aldol reaction of α-alkylamides without any electron-withdrawing group harnessed by specific activation of 7-azaindoline amides under soft Lewis acid/Brønsted base cooperative catalysis is reported. Diastereo- and enantioselective coupling with ynals and aromatic aldehydes as well as divergent functional group interconversion of the amide provided expeditious access to a variety of aliphatic and aromatic chiral building blocks.
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| http://dx.doi.org/10.1021/acs.orglett.6b03890 | DOI Listing |
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