Copper-Catalyzed Cross-Coupling of Benzylic C–H Bonds and Azoles with Controlled <i>N</i>-Site Selectivity
作者:Si-Jie Chen、Dung L. Golden、Shane W. Krska、Shannon S. Stahl
DOI:10.1021/jacs.1c07117
日期:2021.9.15
ambident reactivity of many azoles, however, presents significant selectivity challenges. Here, we report a copper-catalyzed method that achieves site-selective cross-coupling of pyrazoles and other N–H heterocycles with substrates bearing (hetero)benzylic C–H bonds. Excellent N-site selectivity is achieved, with the preferred site controlled by the identity of co-catalytic additives. This cross-coupling
A double heteroatom Mitsunobu coupling with amino hydroxybenzoic acids on solid phase: a novel application of the Mitsunobu reaction to form dendron building blocks
作者:Tzachi Shalit、Amnon Albeck、Gary Gellerman
DOI:10.1016/j.tetlet.2010.08.105
日期:2010.11
A new highly efficient double heteroatom Mitsunobu coupling with amino hydroxybenzoic acids on solid phase is described. The synthetic routes reported in this work are general and applicable for the preparation of diverse building blocks, controlling protection, arm length, chirality, and peripheral functional groups. These novel units can form unusual dendritic architectures, which could be incorporated
There is provided compounds of formula I,
wherein R
1
, R
2
, A
1
, A
2
, A
3
and A
4
have meanings given in the description, and pharmaceutically-acceptable salts thereof, which compounds are useful in the treatment of diseases in which inhibition of the activity of a lipoxygenase (e.g. 15-lipoxygenase) is desired and/or required, and particularly in the treatment of inflammation.
There is provided compounds of formula I,
wherein R
1
, R
2
, X
1
, X
2
and n have meanings given in the description, and pharmaceutically-acceptable salts thereof, which compounds are useful in the treatment of diseases in which inhibition of the activity of a lipoxygenase (e.g. 15-lipoxygenase) is desired and/or required, and particularly in the treatment of inflammation.