A sequential retro-ene arylation reaction has been developed for the conversion of N-alkoxyenamides to the corresponding tert-alkylamines in good yields via the nucleophilic addition of a triarylaluminum reagent to an in situ generated N-acylketimine. The reaction is tolerant of a range of functional groups and provides facile access to a series of tert-alkylamines that would be otherwise difficult to access using conventional procedures.
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We have developed efficient synthetic reactions using enamines and enamides carrying oxygen atom substituent on nitrogen, such as N-alkoxyenamines, N,α-dialkoxyenamines, N-alkoxyanamides, and N-(benzoyloxy)enamides. The umpolung reaction by polarity inversion at the β-position of N-alkoxyenamines afforded α-alkyl-, α-aryl-, α-alkenyl-, and α-heteroarylketones by using aluminum reagent as nucleophiles. Furthermore, one-pot umpolung α-phenylation of ketones has been also developed.
View Article and Find Full Text PDFSequential retro-ene arylation reaction of N-alkoxyenamides for the synthesis of tert-alkylamines.
Org Lett
July 2013
Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan.
A sequential retro-ene arylation reaction has been developed for the conversion of N-alkoxyenamides to the corresponding tert-alkylamines in good yields via the nucleophilic addition of a triarylaluminum reagent to an in situ generated N-acylketimine. The reaction is tolerant of a range of functional groups and provides facile access to a series of tert-alkylamines that would be otherwise difficult to access using conventional procedures.
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