Synthesis 2020; 52(01): 85-97
DOI: 10.1055/s-0037-1610728
paper
© Georg Thieme Verlag Stuttgart · New York

DBU-Catalyzed Inter- and Intramolecular Double Michael Addition of Donor–Acceptor Chromone-Pyrazolone/Benzofuranone Synthons: Access to Spiro-Pyrazolone/Benzofuranone-Hexahydroxanthone Hybrids

Qi Di Wei §
a   Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine, Guizhou University, Guiyang, Guizhou 550025, P. R. of China   Email: xlliu1@gzu.edu.cn
,
Yi-Ming Yao §
a   Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine, Guizhou University, Guiyang, Guizhou 550025, P. R. of China   Email: xlliu1@gzu.edu.cn
,
Shun-Qin Chang
a   Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine, Guizhou University, Guiyang, Guizhou 550025, P. R. of China   Email: xlliu1@gzu.edu.cn
,
Wu-De Yang
b   College of Pharmaceutical Sciences, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou 550025, P. R. of China
,
Min-Yi Tian
a   Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine, Guizhou University, Guiyang, Guizhou 550025, P. R. of China   Email: xlliu1@gzu.edu.cn
,
Xiong-Li Liu
a   Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine, Guizhou University, Guiyang, Guizhou 550025, P. R. of China   Email: xlliu1@gzu.edu.cn
,
Ying Zhou
b   College of Pharmaceutical Sciences, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou 550025, P. R. of China
› Author Affiliations
This work received financial support from National Nature Science Foundation of China (81760625, 81660576 and 81560563) and Projects of Guizhou Province ([2016]5623, JG[2016]06, [2019]1402, [2017]5609 and [2018]5781).
Further Information

Publication History

Received: 27 June 2019

Accepted after revision: 18 August 2019

Publication Date:
13 September 2019 (online)


§ These two authors contributed equally to this work.

Abstract

A DBU-catalyzed inter- and intramolecular double Michael addition of donor–acceptor chromone-pyrazolone/benzofuranone synthons and 3-methyl-4-nitro-5-alkenylisoxazoles has been established, which constructed structurally diverse spiro-pyrazolone/benzofuranone-hexahydroxanthone hybrids bearing five consecutive stereocenters in good yields (up to 91%) with high diastereoselectivities (up to >20:1 dr). Moreover, this strategy further expanded the synthetic potential of bifunctional donor–acceptor chromones, and demonstrated great potential for applications in medicinal chemistry.

Supporting Information