“…However, unlike its relative triptolide, lots of total synthesis and structural modifications have conducted in the past two decades (Chen, Zhou, & Li, 2012; Hou, Liu, & Xu, 2019b; Kaloun et al., 2016; Liu et al., 2018; Ning et al., 2018; Patil et al., 2015; Wang et al., 2017; Xu, Chen, Tang, Feng, & Li, 2014; Xu et al., 2017; Xu & Liu, 2019; Xu, Tang, Feng, & Li, 2014a, 2014b; Xu, Tang, Yang, Feng, & Li, 2014; Zhang, Xiao, & Xu, 2019; Zhou, Yang, Ding, Li, & Miao, 2012), and some triptolide derivatives have already entered clinic for the treatment of challenging cancer and/or rheumatoid arthritis (RA) (Carter et al., 2012; Pao et al., 2019; Patil et al., 2012; Wang, Xu, Fu, Li, & Lou, 2012; Zhou et al., 2005). So far, there is only one total synthesis (Camelio, Johnson, & Siegel, 2015) and several chemical modifications of celastrol have been reported (Figueiredo, Salvador, Cortés, & Cascante, 2017a; Jiang et al., 2016; Kyriakou et al., 2018; Li et al., 2015, 2018; Pang, Luo, Liu, Wu, & Wang, 2018; Shan et al., 2017; Tang, Huang, Pan, Zhang, & Lu, 2015; Zhang, Zhang, Piao, & Quan, 2018; Zhu et al., 2017), which are largely focused on its anti‐cancer activity. In order to further explore the promising multiple biological activities of celastrol and with the aim to find new anti‐HBV agents with novel chemical structure and mechanism of action, herein we reported the synthesis and anti‐HBV activity evaluation of a series of p QM moiety and C‐20‐modified celastrol derivatives (Figure 2).…”