以下为句子列表：
英文: A wide variety of natural products, e. g. alkaloids, β-lactames, biotin, amino sugars has been synthesized by 1, 3-dipolar cycloaddition reaction between nitrones and alkenes.
中文: 摘要通过硝酮与烯烃化合物的1，3-偶极环加成反应合成了许多天然産物，如生物硷、β-内酰胺、生物素、氨基糖等。
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英文: Abstract: A wide variety of natural products, e.g. alkaloids, β-lactames, biotin, amino sugars has been synthesized by 1,3-dipolar cycloaddition reaction between nitrones and alkenes.
中文: 文摘:通过硝酮与烯烃化合物的1，3-偶极环加成反应合成了许多天然产物，如生物碱、β-内酰胺、生物素、氨基糖等。
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英文: The paper reviews the recent progress in [3+2] cycloaddition using azomethine ylide, including preparation of ylide, mechanism and selectivity of reaction, and application in the total synthesis of natural products.
中文: 摘要综述了亚甲胺叶立德的制备、它参与的[3+2]环加成反应的反应机理、反应选择性及在天然产物全合成中的应用等方面的最新进展。
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英文: The system of [4+3] cycloaddition and its application in organic synthesis are reviewed. A brief discussion about the future research is also given.
中文: 摘要本方对[4+3]环加成反应体系以最近在合成中的应用进行了综述，并对进一步研究的方向进行了讨论。
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英文: This paper focuses on the cycloaddition reactions on solid phase supports and their applications in organic synthesis and mechanism research.
中文: 本文介绍了在固相载体上进行的环加成反应，及其在有机合成及反应机理研究中的应用。
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