Palladium catalyzed Heck-arylation/cyclization cascade: An environmentally benign and efficient synthesis of 4-arylcoumarins in water
作者:Junmin Chen、Wei Liu、Liandi Zhou、Yongli Zhao
DOI:10.1016/j.tetlet.2018.05.032
日期:2018.6
An environmentally benign and efficient approach for the synthesis of 4-arylcoumarins from ortho-hydroxy cinnamate ester derivatives with aryl iodides was developed in water under aerobic conditions. This transformation proceeds through a palladiumcatalyzed Heck-arylation/cyclization cascade reaction. The present protocol features a wide substrate scope and readily available starting materials to
Radical-induced expeditious stereoselective synthesis of 2-alkyl 3-allyl <i>trans</i>-2,3-dihydrobenzofurans (TADHBs)
作者:Debayan Sarkar、Sushree Ranjan Sahoo
DOI:10.1080/00397911.2017.1415357
日期:2018.3.4
ABSTRACT A thorough study on radical-induced cyclopropyl ring fragmentation with encompassed olefinic and cyclopropane environment has been performed. Interestingly, the fragmentation has occasioned onto a stereoselective synthesis of 3-allyl trans-2,3-dihydrobenzofurans with impressive yields. The trans-dihydrobenzofurans are present as central core in many molecules of medicinal interest and the
The acrylic acid esters of Formula I are useful for the delivery of organoleptic compounds, especially for flavors, fragrances, masking agents and antimicrobial compounds. They can also deliver fluorescent whitening agents.
Visible-Light-Driven, Photoredox-Catalyzed Cascade of <i>ortho-</i>Hydroxycinnamic Esters To Access 3-Fluoroalkylated Coumarins
作者:Dan Song、Chao-Ming Wang、Zhi-Peng Ye、Peng-Ju Xia、Zhi-Xiong Deng、Jun-An Xiao、Hao-Yue Xiang、Hua Yang
DOI:10.1021/acs.joc.9b00715
日期:2019.6.7
A general and straightforward protocol for di-/perfluoroalkylation of ortho-hydroxycinnamic esters via a photoredox-catalyzed cascade was developed to access a variety of 3-fluoroalkylated coumarins. This method was characterized by all-in-one synthetic design, simplified operation, mild reaction conditions, and broad substrate scope. Moreover, a sequential one-pot procedure starting from commercially available salicylaldehyde was also successfully realized to synthesize 3-fluoroalkylated coumarins.