C–H Functionalization via Remote Hydride Elimination: Palladium Catalyzed Dehydrogenation of <i>ortho</i>-Acyl Phenols to Flavonoids
作者:Xiaomei Zhao、Jiabin Zhou、Shuying Lin、Xukang Jin、Renhua Liu
DOI:10.1021/acs.orglett.6b03652
日期:2017.3.3
Although deprotonation of electron-poor C–H bonds to carbon anions with bases has long been known and widely used in organic synthesis, the hydride elimination from electron-rich C–H bonds to carbon cations or partial carbocations for the introduction of nucleophiles is a comparatively less explored area. Here we report that the carbonyl β-C(sp3)–H bond hydrogens of ortho-acyl phenols could be substituted
Regioselective Cross-Couplings of Coumarins and Flavones with Ethers via C(sp<sup>3</sup>)–H Functionalization
作者:Ben Niu、Wannian Zhao、Yingcai Ding、Zhaogang Bian、Charles U. Pittman、Aihua Zhou、Haibo Ge
DOI:10.1021/acs.joc.5b00800
日期:2015.7.17
Coumarin and flavone derivatives are highly valuable molecules in drug discovery. Here, two new regioselective cross-dehydrogenation couplings of coumarins and flavones with different ethers via C(sp3)–H functionalization processes were developed, generating new ether-substituted derivatives not previously reported. These reactions proceeded well via radical mechanisms and provided the corresponding
Bicycloheteroaryl compounds as P2X7 modulators and uses thereof
申请人:Kelly G. Michael
公开号:US20060217448A1
公开(公告)日:2006-09-28
Bicycloheteroaryl compounds are disclosed that have a formula represented by the following:
The compounds may be prepared as pharmaceutical compositions, and may be used for the prevention and treatment of a variety of conditions in mammals including humans, including by way of non-limiting example, pain, inflammation, traumatic injury, and others.
Bicycloheteroaryl Compounds as P2X7 Modulators and Uses Thereof
申请人:Kelly G Michael
公开号:US20080039478A1
公开(公告)日:2008-02-14
Bicycloheteroaryl compounds are disclosed that have a formula represented by the following:
The compounds may be prepared as pharmaceutical compositions, and may be used for the prevention and treatment of a variety of conditions in mammals including humans, including by way of non-limiting example, pain, inflammation, traumatic injury, and others.
Martin Silicates as Partners in Photoredox/Ni Dual Catalysis for the Installation of CH
<sub>3</sub>
, CH
<sub>2</sub>
D, CD
<sub>2</sub>
H, CD
<sub>3</sub>
and
<sup>13</sup>
CH
<sub>3</sub>
Groups onto (Hetero)Arenes
the easily prepared and bench-stable Martin methylsilicates bearing two C,O-bidentate hexafluorocumyl alcohol ligands as a class of radical precursors for dual catalysis enabling the chemoselective methylation of (hetero)aryl halides and acyl chlorides as well as the access to the corresponding CD3, CD2H, CHD2 and 13CH3 analogs in good yields.
在 C sp 2中心上引入甲基及其13 C 和2 H 标记的类似物仍然是合成化学中的一个具有挑战性的问题。虽然光氧化还原/Ni 双催化已被证明是形成 C sp 2 -C sp 3键的有价值的方法,但产生甲基自由基和控制其反应性的高难度严重限制了可靠工艺的开发。在此,我们介绍了易于制备且稳定的 Martin 甲基硅酸盐,带有两个C、O-双齿六氟异丙苯醇配体作为一类用于双重催化的自由基前体,可实现(杂)芳基卤化物和酰氯的化学选择性甲基化,以及获得相应的 CD 3 、CD 2 H 、 CHD 2和13 CH 3类似物良好的产量。