Hourtoule M, Miesch L. Regio- and Stereoselective Addition to
gem-Difluorinated Ene-Ynamides: Access to Stereodefined Fluorinated Dienes.
Org Lett 2022;
24:3896-3900. [PMID:
35587253 DOI:
10.1021/acs.orglett.2c01593]
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Abstract
The first synthesis of gem-difluorinated ene-ynamides is presented via deprotonation of trifluoromethylated N-allenamides and δ extrusion of fluorine. These highly reactive building blocks, owing to their dual functional groups, offer a unique entry to difluorinated dienes and to stereodefined, monofluoro-substituted dienes. Stereoselective addition to the ynamide moiety led to difluorinated dienes. A stereocontrolled domino δ elimination reaction followed by an addition/elimination sequence from trifluoromethylated N-allenamides provided exclusively stereodefined monofluorinated ene-ynamides.
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