Volume 33, Issue 7 pp. 723-728
Full Paper

Synthesis of Two Coumarins Isolated from Aster praealtus

Bo Wang

Bo Wang

State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

Key Laboratory of Green Chemical Technology of College of Heilongjiang Province, School of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China

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Huijun Chen

Huijun Chen

State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

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Yikang Wu

Corresponding Author

Yikang Wu

State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

Yikang Wu, State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

Bo Liu, Key Laboratory of Green Chemical Technology of College of Heilongjiang Province, School of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China

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Bo Liu

Corresponding Author

Bo Liu

Key Laboratory of Green Chemical Technology of College of Heilongjiang Province, School of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China

Yikang Wu, State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

Bo Liu, Key Laboratory of Green Chemical Technology of College of Heilongjiang Province, School of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China

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First published: 02 June 2015

Abstract

Two coumarins isolated from Aster praealtus were synthesized via a direct coupling of the corresponding cyclohexyl carbinol with a coumarin-derived aryl bromide or iodide, a very difficult etherification due to the excess steric congestion around the carbinol and the low reactivity of the aryl halide that frustrated many seemingly feasible protocols. Unequivocal 1H and 13C NMR data for these compounds were thus made available for the first time. Uncertainty and errors in 1H and 13C NMR data in previous reports are also eliminated and revealed, respectively.

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