α-选择性 - - 碳三甲基甲基thiolation 的阿尔基因
Prachi Shah1, Wojciech Chaładaj1
1Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
Organic letters
|March 3, 2025
概括
这项研究引入了一种用于基二功能化的新方法,实现了三甲基thiolation的马尔科夫尼科夫选择性. 这种新方法允许精确的α选择性引入三甲基 (SCF3) 组.
科学领域:
- 有机化学 有机化学
- 合成方法论 合成方法论
- 有机金属化学 有机金属化学
背景情况:
- 传统的三甲基thiolation的alkynes产生反马尔科夫尼科夫的产品.
- 在基因功能失调中实现马尔科夫尼科夫的选择性仍然是一个挑战.
研究的目的:
- 开发一种新型的合成路径,用于基因的邻近合成-化-三甲基thiolation.
- 为了使马尔科夫尼科夫的选择性,三甲基 (SCF3) 组的α引入.
主要方法:
- 一个连续的过程,将催化碳磁化与铜介导的三甲基化合并.
- 使用在现场产生的乙烯-物种.
主要成果:
- 开发的方法实现了独家的合成立体选择性.
- 区域和立体选择性是由最初的碳磁化步骤决定的.
- 证明了SCF3组的成功阿尔法选择性引入.
结论:
- 这项工作在控制基三甲基thiolation的选择性方面取得了突破.
- /催化序列反应为合成有价值的含SCF3的化合物提供了强大的工具.
相关概念视频
02:27Preparation of Alkynes: Alkylation Reaction
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Introduction
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.
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.
9.8K
02:38Electrophilic Addition to Alkynes: Halogenation
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Introduction
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.
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.
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02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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Introduction
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.
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.
7.6K
02:42Acidity of 1-Alkynes
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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
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Introduction
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.
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.
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02:34Preparation of Alkynes: Dehydrohalogenation
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Introduction
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.
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.
15.6K