稠环和桥环四氢呋喃支架存在于许多天然产物和生物活性化合物中。本文报道了一种新的铜催化烯烃分子内碳醚化合成双环四氢呋喃。该反应涉及铜催化的醇与未活化烯烃的分子内加成,随后芳基 CH 官能化提供 CC 键。机理研究表明,涉及一个主要的碳自由基中间体,芳环上的自由基加成是可能的 CC 键形成机制。初步的催化对映选择性反应很有希望(高达 75% ee),并提供证据表明铜参与烯烃加成步骤,可能是通过顺式氧化铜机制。催化对映选择性烯烃碳醚化反应很少见,未来将这种新方法发展为高度对映选择性工艺是有希望的。在机理研究过程中,还制定了烯烃加氢醚化的方案。
I<sub>2</sub>-Mediated oxidative bicyclization of 4-pentenamines to prolinol carbamates with CO<sub>2</sub> incorporating oxyamination of the CC bond
作者:Sheng Wang、Xiaowei Zhang、Chengyao Cao、Chao Chen、Chanjuan Xi
DOI:10.1039/c7gc01992k
日期:——
oxyamination reaction of alkenes with ambient CO2 is reported. In the presence of I2 and DBU, CO2 is applied in situ as a protectinggroup to regulate the nucleophilicity of the aminogroup and facilitate the bicyclization of 4-pentenamines with high chemoselectivity. Moreover, this reaction provided a feasible approach to prepare prolinol carbamates with good tolerance of functional groups and high efficiency
Palladium(II)‐Catalyzed Aminotrifluoromethoxylation of Alkenes: Mechanistic Insight into the Effect of
<i>N</i>
‐Protecting Groups
作者:Chaohuang Chen、Chuanqi Hou、Pinhong Chen、Guosheng Liu
DOI:10.1002/cjoc.201900516
日期:2020.4
An efficientpalladium‐catalyzed regioselective 5‐exo aminotrifluoromethoxylation of alkenes has been established herein, which provides a practical route towards the synthesis of OCF3‐containing pyrrolidines. tert‐Butyloxycarbonyl (Boc) as an amino protectinggroup plays a significant role in both the chemo‐ and regioselectivities. In addition, preliminary mechanistic studies reveal that the amino
Enantioselective Pd(II)-Catalyzed Intramolecular Oxidative 6-<i>endo</i> Aminoacetoxylation of Unactivated Alkenes
作者:Xiaoxu Qi、Chaohuang Chen、Chuanqi Hou、Liang Fu、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.8b03767
日期:2018.6.20
A novel asymmetric 6-endo aminoacetoxylation of unactivatedalkenes by palladium catalysis, which yields chiral β-acetoxylated piperidines with excellent chemo-, regio- and enantioselectivities under very mild reaction conditions, has been established herein by employing a new designed pyridine-oxazoline (Pyox) ligand. Importantly, introducing a sterically bulky group into the C-6 position of Pyox
This invention relates to novel compounds useful as potassium channel modulators. More specifically the invention provides chemical compounds useful as modulators of SK
Ca
and/or IK
Ca
channels.
Asymmetric Palladium-Catalyzed Aminochlorination of Unactivated Alkenes
作者:Zhigang Wang、Chuanqi Hou、Pinhong Chen
DOI:10.1021/acs.orglett.3c00771
日期:2023.4.21
A novel Pd-catalyzed enantioselective aminochlorination of alkenes via a 6-endo cyclization is reported herein, which provides easy access to a wide array of structurally diverse 3-chloropiperidines in good yields with excellent enantioselectivities. Notably, both an electrophilic chlorination reagent (NCS) and the sterically bulky chiral pyridinyl-oxazoline (Pyox) ligand are crucial to the successful