Photocatalytic Dehydrogenative Cross-Coupling of Alkenes with Alcohols or Azoles without External Oxidant
作者:Hong Yi、Linbin Niu、Chunlan Song、Yiying Li、Bowen Dou、Atul K. Singh、Aiwen Lei
DOI:10.1002/anie.201609274
日期:2017.1.19
Direct cross‐coupling between alkenes/R‐H or alkenes/RXH is a dream reaction, especially without external oxidants. Inputting energy by photocatalysis and employing a cobalt catalyst as a two‐electron acceptor, a direct C−H/X−H cross‐coupling with H2 evolution has been achieved for C−O and C−N bond formation. A new radical alkenylation using alkene as the redox compound is presented. A wide range of
A 9,10-dicyanoanthracene (DCA)-photosensitized reaction of 3-cyano- or 3-ethoxy-2,2-diarylthietane in acetonitrile gave selectively 2-cyano- or 2-ethoxy-1,1-diarylethene. The ring-splitting reaction proceeds via a one-electron oxidation of the sulfur atom of thietane ring by a photochemical electron transfer to the excited singlet state of DCA.
A transition-metal-free protocol for the synthesis of non-terminal alkenylethers, alkenylsulfides, and N-vinylazoles fromarylaldehydes or diarylketones, DMSO and O, S, N-nucleophiles has been reported. In this protocol, 24 examples of non-terminal alkenylethers and 28 examples of non-terminal alkenylsulfides in 72–95% yields have been synthesized within 5 min. Moreover, 27 examples of non-terminal
Ethoxy Diphenyl Ethane Derivatives, Preparation Processes and Uses Thereof
申请人:Wu Fanhong
公开号:US20120046492A1
公开(公告)日:2012-02-23
The invention discloses an ethoxydiphenylethane derivative and a synthetic method and uses thereof 4′ position of phenylethane B aromatic ring is chemically modified by ethoxy and hydroxy at position 3′ thereof is simultaneously modified to water soluble prodrug such as phosphate, and similarly, amino acid side chain is introduced to amino at position 3′ to form amino acid amide water soluble prodrug having the structure shown as formula (I)
the ethoxydiphenylethane derivative and the prodrug thereof include strong tubulin aggregation inhibiting ability and obvious target damage effect for tumor vessels, selectively cause dysfunction and structural damage of tumor vessels and induce apoptosis of vascular endothelial cells in order to play the role of killing tumor cells or inhibiting tumor metastasis in case that the tumor cells are free from the support of nutrition and oxygen.