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37 results on '"Duan, Xiyan"'

1. Chemodivergent Synthesis of Benzofurans and 2,3‐Dihydrobenzofurans via Tandem Oxidative Annulation of Enaminones and Salicylaldehydes.

Author

Duan, Xiyan, Li, Hui, Wang, Junqi, Liu, Kun, Shi, Meixin, Lian, Weidong, Chen, Ran, and Liu, Pu

Subjects
*BENZOFURAN synthesis, *ALDOL condensation, *HALOGENATION, *BENZOFURANS, *FUNCTIONAL groups, *PARAMETER identification, *ANNULATION
Abstract

Comprehensive Summary: Chemodivergent synthesis of benzofurans and 2,3‐dihydrobenzofurans has been realized. Under a reaction system consisting of DBDMH and K2CO3 as promotors, controlled conditions enabled the formation of two sets of valuable heterocycles from the tandem transformation of enaminones and salicylaldehydes. The key to success was the identification of the reaction parameters, in which the imine intermediate which was formed by transient halogenation coupling and substitution processes underwent either aldol condensation/annulation or imine hydrolysis/aldol condensation. The additives NH4Cl or Fe2(SO4)3 controlled the unique selectivity of this reaction. A broad substrate scope of enaminones and salicylaldehydes has been employed in this reaction, demonstrating excellent functional group tolerance and versatility. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Effect of mass sports activity on prosocial behavior: A sequential mediation model of flow trait and subjective wellbeing

Author

Duan, Xiyan, Wang, Xiaohua, Li, Xiaogang, Li, Shichen, Zhong, Yiping, and Bu, Te

Subjects
Mental Health, Surveys and Questionnaires, Public Health, Environmental and Occupational Health, Humans, Altruism, Exercise, Personality
Abstract

ObjectivesParticipation in mass sports is one of the most efficient strategies for people to attain physical and mental health in China. Prosocial behavior has a positive effect on social development. This study developed a conceptual model with mass sports activity as the independent variable, prosocial behavior as the dependent variable, and flow trait and subjective wellbeing as the mediating variables.MethodsParticipants (N= 351) completed an online survey. Mass sports activity, flow trait, subjective wellbeing, and prosocial behavior were measured using the physical activity rank scale-3 (PARS-3), short dispositional flow scale (SDFS), index of wellbeing (IWB), and prosocial tendencies measure (PTM), respectively. Descriptive statistics compared differences between sports population (PARS-3, ≥ 36) and non-sports population (PARS-3, ResultsSports population scored significantly higher (allP≤ 0.05) on SDFS, IWB, and PTM than non-sports population. Participation in mass sports stimulated flow trait and thus improved prosocial behavior, with a mediation effect value of 0.061 (95%CI, 0.028–0.104), which accounted for 30.18% of the total effect. Participation in mass sports enhanced subjective wellbeing and thus improved prosocial behavior, with a mediation effect value of 0.044 (95%CI, 0.007–0.090), which accounted for 21.96% of the total effect. Flow trait and subjective wellbeing mediated the relationship between mass sports activity and prosocial behavior in a sequential manner, with a mediation effect value of 0.059 (95%CI, 0.035–0.090), which accounted for 29.23% of the total effect.ConclusionThe preliminary results of the mediation model validated the hypothesized sequential links between mass sports activity, flow trait, subjective wellbeing, and prosocial behavior. Greater participation in mass sports increases the likelihood of prosocial behavior.

Published
2022

26. An Unexpected Potassium Iodide-Promoted Nucleophilic Substitution Reaction between 2-Acyloxy-2H-azirines and Carboxylic Acids

Author

Duan, Xiyan, primary, Yang, Kun, additional, Liu, Jianwei, additional, Kong, Xianglei, additional, Liang, Ju, additional, Zhou, Dongju, additional, Zhou, Huiyun, additional, Zhang, Yanping, additional, Liu, Ning, additional, Feng, Shuxiao, additional, Gu, Guangna, additional, Lu, Jun, additional, Song, Nazi, additional, Zhang, Dongliang, additional, and Ma, Junying, additional

Published
2016
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27. Iridium‐Catalyzed Dynamic Kinetic Stereoselective Allylic Etherification of Achmatowicz Rearrangement Products.

Author

Zhu, Zhongpeng, Wang, Hao‐Yuan, Simmons, Christopher, Tseng, Po‐Sen, Qiu, Xiang, Zhang, Yu, Duan, Xiyan, Yang, Jing‐Kui, and Tang, Weiping

Subjects
IRIDIUM catalysts, STEREOSELECTIVE reactions, ETHERIFICATION, REARRANGEMENTS (Chemistry), ISOMERIZATION kinetics, LIGANDS (Chemistry)
Abstract

Abstract: We recently developed a novel Ir‐catalyzed dynamic kinetic isomerization reaction for Achmatowicz rearrangement products. In this update, we show that products derived from the Achmatowicz rearrangement can also undergo Ir‐catalyzed dynamic kinetic allylic etherification in the presence of an appropriate ligand and additive to afford useful intermediates for the synthesis of carbohydrates. The addition of the triphenyl phosphite ligand shuts down the isomerization pathway and promotes the allylic etherification pathway. The addition of diphenyl phosphate improved the diastereoselectivity for the addition reaction. Interestingly, opposite diastereoselectivity was observed for sterically demanding alcohol nucleophiles compared to less sterically demanding alcohol nucleophiles. The method was also applied to the synthesis of several 2,3‐dideoxypyranosides. [ABSTRACT FROM AUTHOR]

Published
2018
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33. An Unexpected Potassium Iodide-Promoted Nucleophilic Substitution Reaction between 2-Acyloxy-2 H-azirines and Carboxylic Acids.

Author

Duan, Xiyan, Yang, Kun, Liu, Jianwei, Kong, Xianglei, Liang, Ju, Zhou, Dongju, Zhou, Huiyun, Zhang, Yanping, Liu, Ning, Feng, Shuxiao, Gu, Guangna, Lu, Jun, Song, Nazi, Zhang, Dongliang, and Ma, Junying

Subjects
*POTASSIUM iodide, *NUCLEOPHILIC substitution reactions, *CARBOXYLIC acids, *AZIRINES, *CHEMICAL bonds, *ESTERS
Abstract

The acyloxy group of 2-acyloxy-2 H-azirines has been displaced by carboxylic acids to generate the corresponding 2-acyloxy-2 H-azirines by using potassium iodide as a promotor. This metal-free method can be performed with a wide scope of substrates readily generating products in moderate to high yields. It also represents an example of nucleophilic substitution between esters and carboxylic acids under metal-free reaction conditions for the first time. [ABSTRACT FROM AUTHOR]

Published
2016
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36. Synthesis of Triazole‐Epothilones by Using Cu2O Nanoparticles to Catalyze 1,3‐Dipolar Cycloaddition

Author

Duan, Xiyan, Zhang, Yan, Ding, Yahui, Lin, Jianping, Kong, Xianglei, Zhang, Quan, Dong, Changming, Luo, Guoan, and Chen, Yue

Abstract

We report the total synthesis of a triazole‐epothilone analogue 1. The key step to generate the macrocyclic ring and the triazole ring was to apply Cu2O nanoparticles (Cu2O‐NPs) to catalyze the 1,3‐dipolar cycloaddition. The conformation of 1and its bioactivity in MCF cancer cell lines were investigated.

Published
2012
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37. ChemInform Abstract: KI/TBHP-Mediated Oxidative Cross-Coupling of Enamines and Carboxylic Acids under Metal-Free Conditions: A Facile Access to Functionalized 2H-Azirines.

Author

Duan, Xiyan and et al.

Subjects
*ENAMINES, *CARBOXYLIC acids, *AZIRIDINE derivatives
Abstract

A novel method for the synthesis of the acyloxylated 2H-azirines through oxidative cross coupling reaction between the enamines and acids in MeCN is described. [ABSTRACT FROM AUTHOR]

Published
2016
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