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 Difluoromethylation of Aryl and Vinyl Iodides
作者:Patrick S. Fier、John F. Hartwig
DOI:10.1021/ja301013h
日期:2012.3.28
straightforward method for the cross-coupling of aryl and vinyliodides with a difluoromethyl group generated from readily available reagents to form difluoromethylarenes and difluoromethyl-substituted alkenes. The reaction of electron-neutral, electron-rich, and sterically hindered aryl and vinyliodides with the combination of CuI, CsF and TMSCF(2)H leads to the formation of difluoromethyl-substituted
[EN] DIFLUOROMETHYLATION OF ARYL AND VINYL IODIDES<br/>[FR] DIFLUOROMÉTHYLATION D'IODURES D'ARYLE ET DE VINYLE
申请人:UNIV CALIFORNIA
公开号:WO2013134296A1
公开(公告)日:2013-09-12
Selectively fluorinated molecules are important as materials, pharmaceuticals, and agrochemicals, but their synthesis by simple, mild, laboratory methods is challenging. We report a straightforward method for the cross-coupling of a difluoromethyl group with readily available reagents to form difluoromethylarenes. The reaction of electron-neutral, electronrich, and sterically hindered aryl and vinyl iodides with the combination of Cul, CsF and TMSCF2H leads to the formation of difluoromethylarenes in high yield with good functional group compatibility. This transformation is surprising, in part, because of the prior observation of the instability of CuCF2H.
Phosphodiesterase 4 inhibitors, including N-substituted aniline and diphenylamine analogs
申请人:Schumacher A. Richard
公开号:US20050119225A1
公开(公告)日:2005-06-02
PDE4 inhibition is achieved by novel compounds, e.g., N-substituted aniline and diphenylamine analogs. The compounds of the present invention are of Formula I:
wherein R
1
, R
2
, R
3
and R
4
are as defined herein.
PHOSPHODIESTERASE 4 INHIBITORS, INCLUDING N-SUBSTITUTED ANILINE AND DIPHENYLAMINE ANALOGS
申请人:SCHUMACHER Richard A.
公开号:US20090048255A1
公开(公告)日:2009-02-19
PDE4 inhibition is achieved by novel compounds, e.g., N-substituted aniline and diphenylamine analogs. The compounds of the present invention are of Formula I:
wherein R
1
, R
2
, R
3
and R
4
are as defined herein.