终端和内部基的无金属基化
Jiabin Chen1, Xiaoyan Bai1, Haobo Jiang1
1School of Environmental and Chemical Engineering, Jiangmen Key Laboratory of Synthetic Chemistry and Cleaner Production, Wuyi University, Jiangmen 529020, P. R. China. wyuchemcl@126.com.
一种新的激素反应使得基的直接基化成为可能. 这种无金属的方法可以使用生物活性分子,如L(-) -borneol和L-menthol,使用可访问的试剂.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
- 药用化学 医学化学
背景情况:
- 基化是一种有价值的转化,用于引入和酸的功能.
- 现有的基化方法通常需要金属催化剂或恶劣的条件.
- 开发高效且无金属的合成路径对于可持续化学至关重要.
研究的目的:
- 开发一种新的,不含金属的合成策略,用于直接化的化.
- 为了证明这种方法对来自生物活性天然产品的基因的适用性.
- 为形成C-Se和C-S键形成建立一种基于根的多功能方法.
主要方法:
- 用一种基因介导反应途径直接化终端和内部基因.
- 在没有金属的条件下,反应使用易于获得的试剂.
- 合成策略经过验证,使用来自生物相关分子的基,包括L(-) - 玻利和L-menthol.
主要成果:
- 从各种终端和内部基因中成功生成直接基化产物.
- 已证明与复杂分子结构的兼容性,以L(-) - 波醇和L-menthol衍生物为例.
- 在温和的无金属反应条件下实现高效率和选择性.
结论:
- 已经建立了一个强大的和高效的无金属合成策略,用于基基化.
- 该方法为将和酸基组纳入生物活性分子提供了一种实用方法.
- 这种激进的过程为合成有机和药物化学家提供了宝贵的新工具.
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相关概念视频
02:27Preparation of Alkynes: Alkylation Reaction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
02:40Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.
02:38Electrophilic Addition to Alkynes: Halogenation
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
02:34Preparation of Alkynes: Dehydrohalogenation
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.