Ph3P/I2-Mediated Synthesis of 3-Aryl-Substituted and 3,4-Disubstituted Coumarins
Wong Phakhodee*, Chuthamat Duangkamol, Dolnapa Yamano, Mookda Pattarawarapan
*Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand, Email: wongp2577gmail.com
W. Phadhodee, C. Duangkamol, D. Yamano, M. Pattarawarapan, Synlett, 2017, 28, 825-830.
DOI: 10.1055/s-0036-1588941 (free Supporting Information)
see article for more reactions
A Ph3P/I2-Et3N-mediated one-pot two-step esterification-cyclization provides 3-aryl coumarins and 3-aryl-4-methylcoumarins from aryl acetic acids containing a steric or reactive group and 2-hydroxybenzaldehydes or 2′-hydroxyacetophenones smoothly at room temperature in good to excellent yields.
see article for more examples
carboxylic acids, chemoselectivity, phosphorous, coumarins, cyclization