We thank the Science and Technology Program of Guangdong Province,Strategic Cooperation Program between Guangdong Province and Chinese Academy of Sciences and National Key Technology R&D Program,China(Nos. 2003B31603,2006B35604002,2009B091300125 and 2007BAD82B02) for financial support
Two bioactive natural 4-arylcoumarins,5,7,4'-trimethoxy-4-phenylcoumarin(1a),5,7-dimethoxy-4-phenylcoumarin(1b) and five closely related derivatives 1c-g were synthesized.In vitro evaluation with a catechol subun...