Consecutive β,β′‐Selective C(sp
<sup>3</sup>
)−H Silylation of Tertiary Amines with Dihydrosilanes Catalyzed by B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>3</sub>
the two‐fold C(sp3)−H silylation of various trialkylamine derivatives with dihydrosilanes, furnishing the corresponding 4‐silapiperidines in decent yields. The multi‐step reaction cascade involves amine‐to‐enamine dehydrogenation at two alkyl residues and two electrophilic silylation reactions of those enamines, one inter‐ and one intramolecular.
Copper-Mediated Oxidative Fluorination of Aryl Stannanes with Fluoride
作者:Raymond F. Gamache、Christopher Waldmann、Jennifer M. Murphy
DOI:10.1021/acs.orglett.6b02125
日期:2016.9.16
A regiospecific method for the oxidative fluorination of aryl stannanes using tetrabutylammonium triphenyldifluorosilicate (TBAT) and copper(II) triflate is described. This reaction is robust, uses readily available reagents, and proceeds via a stepwise protocol under mild conditions (60 °C, 3.2 h). Broad functional group tolerance, including arenes containing protic and nucleophilic groups, is demonstrated
N-alkyl(cycloalkyl)benzylamines, p-fluorobenzylamines, (1-phenylethyl)amines, [1-(p-fluorophenyl)ethyl]amines were synthesized by hydroamination of aldehydes and ketones with oximes.