Journal
ORGANIC LETTERS
Volume 24, Issue 37, Pages 6728-6733Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.2c02476
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- Ministry of Science and Technology of Taiwan [MOST 110- 2113-M-077-001]
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A novel Pd-catalyzed reaction was developed for the synthesis of 4H-furo[3,2-c]chromenes and xanthones through tandem cyclization/cross-coupling reaction of 3-alkynyl chromone with aryl iodide. The reaction selectively controlled by KF or a bidentate phosphine ligand exhibited a rare difunctionalization of alkynes through O-attack/5-exo-dig and C-attack/6-endo-dig cyclization. A one-pot tandem process was demonstrated directly from gamma-alkynyl-1,3-diketone for this method.
A novel Pd-catalyzed chemo-and regiocontrolled tandem cyclization/cross-coupling reaction of 3-alkynyl chromone with aryl iodide was developed for the synthesis of 4H-furo[3,2-c]chromenes and xanthones. The difunctionalization of alkynes through O-attack/5-exo-dig and C-attack/6-endo-dig cyclization was reported by this rare approach, which was selectively controlled by the addition of KF or a bidentate phosphine ligand. A one-pot tandem process was demonstrated directly from gamma-alkynyl-1,3-diketone for this method.
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