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Tian X, Zhang YK, You YX, Han JR, Cheng QS, Fan SM, Chen DD, Wang TT, Liu S, Su W. LiO tBu-Promoted trans-Stereoselective and β-Regioselective Hydroboration of Propargyl Alcohols. Org Lett 2023; 25:6401-6406. [PMID: 37603790 DOI: 10.1021/acs.orglett.3c02411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
A convenient and efficient trans-stereoselective and β-regioselective hydroboration of propargyl alcohols was achieved simply with LiOtBu as the base and (Bpin)2 as the boron reagent in dimethyl sulfoxide at room temperature. Both terminal and internal propargyl alcohols with diverse structures and functional groups underwent the transformation smoothly to produce β-Bpin-substituted (E)-allylic alcohols, of which the synthetic potentials were demonstrated by the downstream conversions of boronate, alkenyl, and hydroxyl groups.
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Affiliation(s)
- Xia Tian
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Yu-Kun Zhang
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Ya-Xin You
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Jian-Rong Han
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Qiu-Shi Cheng
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
- Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Shi-Ming Fan
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Di-Di Chen
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Ting-Ting Wang
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Shouxin Liu
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
| | - Wei Su
- School of Science, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
- Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, Hebei University of Science and Technology, Shijiazhuang, Hebei 050022, People's Republic of China
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Su W, Wang TT, Tian X, Han JR, Zhen XL, Fan SM, You YX, Zhang YK, Qiao RX, Cheng Q, Liu S. Stereoselective Dehydroxyboration of Allylic Alcohols to Access ( E)-Allylboronates by a Combination of C-OH Cleavage and Boron Transfer under Iron Catalysis. Org Lett 2021; 23:9094-9099. [PMID: 34780200 DOI: 10.1021/acs.orglett.1c03359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Iron-catalyzed direct SN2' dehydroxyboration of allylic alcohols has been developed to access (E)-stereoselective allylboronates. Allylic alcohols with diverse structures and functional groups, especially derived from natural products, underwent smooth transformation. The six-membered ring transition state formed by allylic alcohols and iron-boron intermediate was indicated to be the key component involved in transfer of the boron group, activation of the C-OH bond, and control of the stereoselectivity.
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Affiliation(s)
- Wei Su
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Ting-Ting Wang
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Xia Tian
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Jian-Rong Han
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Xiao-Li Zhen
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Shi-Ming Fan
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Ya-Xin You
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Yu-Kun Zhang
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Rui-Xiao Qiao
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Qiushi Cheng
- School of Science, Hebei University of Science and Technology, Shijiazhuang 050022, China.,Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, Hebei University of Science and Technology, Shijiazhuang 050022, China
| | - Shouxin Liu
- Hebei Key Laboratory of Molecular Chemistry for Drug, Hebei University of Science and Technology, Shijiazhuang 050022, China
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Xing Y, Yu X, Zhu J, Chang YM, You YX, Chen ZK, Dou YQ, Ma DF, Tong XM. [Levels of human milk oligosaccharides in breast milk of mothers delivering preterm infants of different gestational ages and their effects on early growth and development]. Zhonghua Yu Fang Yi Xue Za Zhi 2021; 55:1067-1076. [PMID: 34619923 DOI: 10.3760/cma.j.cn112150-20210513-00468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the human milk oligosaccharides (HMOs) levels in breast milk of mothers delivering preterm infants and their effects on the early growth and development of infants. Methods: In this prospective cohort study, full-term and preterm newborns whose parents decided to breastfeed were recruited from Peking University Third Hospital between December 1, 2017 and November 30, 2018. The preterm infants were divided based on their gestational ages into extremely preterm (<28 weeks), very preterm (28-31+6 weeks) and moderate to late preterm (32-36+6 weeks) groups. Breast milk was collected from mothers at 7, 14, 28 and 120d postpartum. 368 breast milk samples were collected from 125 mothers in this study, including 54 mothers of full-term infants, 23 mothers of moderate to late preterm infants, 39 mothers of very preterm infants, and 9 mothers of extremely preterm infants. Ultra-performance liquid chromatography-mass spectrometer (UPLC-MS/MS) was used to determine the concentration of 2'-fucosyllactose (2'FL), 3-fucosyllactose (3FL), 3'-sialyllactose (3'SL), A-tetrasaccharide (P1), lacto-N-tetraose (LNT), lacto-N-neotetraose (LNnT), lacto-N-fucopentaose Ⅱ (LNFP-Ⅱ) and lacto-N-fucopentaose Ⅴ (LNFP-Ⅴ). Secretor status of mothers was defined as 2'-fucosyllactose (2'FL) concentration in colostrum and transitional milk greater than 200 μg/mL. Weight gain and the occurrence of allergic diseases of infants were collected at 120 d(4 months) postpartum. The chi-square test or the Fisher's exact test was used for the comparison of categorical data between groups; Kruskal-Wallis test and Wilcoxon rank sum test were used for comparison of continuous data between groups. Nemenyi test was used for multiple comparison. Results: 79.2% (99/125) of the mothers were secretor. There were no statistical differences between groups in the secretor status of mothers (χ²=1.31,P>0.05). The total concentration of HMOs peaked at 1-2 weeks postpartum. Compared to the preterm milk, the HMOs from the term milk was trending downwards at an earlier time. In the breast milk of secretor mothers on 28 d, total concentration of HMOs significant differed among the three groups of preterm milk and the term milk, with the median value of 4 587.09,4 615.25,5 277.44,5 476.03 μg/mL, respectively (Kruskal-Wallis χ²=8.1234,P=0.044). When analyzed by the median weight gain of the infants (low vs high weight gain) at 4 months postpartum, 2'FL was significantly lower in the high weight gain group at 7 d (1 818.04 μg/mL vs 2 181.67 μg/mL, W=1 386,P=0.018), while LNT & LNnT were significantly higher (1 182.36 μg/mL vs 1 053.62 μg/mL, W=816,P=0.044). The level of 3FL at 120 d was significantly affected by presence of allergic disease in infants, breast milk from mothers of infants with allergic disease had lower 3FL than those from mothers of infants without allergic disease (256.17 μg/mL vs 286.18 μg/mL, W=564,P=0.026). Conclusions: The overall profiles of HMOs in breast milk of mothers delivering preterm infants was basically the same as that of mothers delivering term infants; individual HMOs play a role in weight gain and the development of allergic diseases in preterm infants, but the mechanism is unclear and needs further study.
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Affiliation(s)
- Y Xing
- Department of Pediatrics, Peking University Third Hospital, Beijing 100191, China
| | - X Yu
- Department of Social Medicine and Health Education,School of Public Health, Peking University, Beijing 100191,China
| | - J Zhu
- Functional Evaluation Center,Beijing Institute of Nutritional Resources, Beijing 100069,China
| | - Y M Chang
- Department of Pediatrics, Peking University Third Hospital, Beijing 100191, China
| | - Y X You
- Department of Pediatrics, Peking University Third Hospital, Beijing 100191, China
| | - Z K Chen
- Department of Social Medicine and Health Education,School of Public Health, Peking University, Beijing 100191,China
| | - Y Q Dou
- Department of Social Medicine and Health Education,School of Public Health, Peking University, Beijing 100191,China
| | - D F Ma
- Department of Social Medicine and Health Education,School of Public Health, Peking University, Beijing 100191,China
| | - X M Tong
- Department of Pediatrics, Peking University Third Hospital, Beijing 100191, China
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You YX, Miao GP, Liu YZ. A fast method for acoustic imaging of multiple three-dimensional objects. J Acoust Soc Am 2000; 108:31-37. [PMID: 10923867 DOI: 10.1121/1.429441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This paper is concerned with the inverse problem for imaging multiple three-dimensional objects using the information of the far-field pattern of the scattered wave. A spatially dependent function, which has noticeably different values inside and outside the obstacle, is derived. A numerical method based on the characterization is developed to obtain a visualization of the obstacle. The most remarkable advantage of this method is that it does not need any prior knowledge about the geometry and physical properties of the scatterer, and requires only the information of the far-field measurements for a finite number of directions of incidence and observation distributed over a limited range. Furthermore, the scheme is very simple and fast since it avoids the use of the iterative procedure and requires only the solution of a linear system. Some numerical examples with synthetic far-field data are given showing the practicality and efficiency of this scheme.
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Affiliation(s)
- Y X You
- School of Naval Architecture and Ocean Engineering, Shanghai Jiaotong University, People's Republic of China.
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You YX, Yong HY, Zhong Y, Wang FY. [Effect of time of administration of bis-A-TDA on its teratogenic actions in pregnant Wistar rats]. Yao Xue Xue Bao 1983; 18:15-9. [PMID: 6858691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Wang FY, Zhong Y, Yong HY, You YX, Wang XZ. [Preliminary study on the teratogenic effect of thiadiazole compounds]. Yao Xue Xue Bao 1981; 16:654-60. [PMID: 7331813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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