Pd-催化级联Heck/C(sp3) -H激活用于螺旋cyclopropyl氧化物
Saleem Hafeez1, Ruchi Sharma1, Swati Jain1
1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Organic letters
|June 7, 2024
概括
一种新型的催化反应通过C(sp3) -H激活合成了螺旋cyclopropyloxindoles. 这种高效的方法为复杂分子提供了一条新的途径,包括有价值的类化合物.
科学领域:
- 有机化学 有机化学
- 催化剂是一种催化剂.
- 合成方法论 合成方法论
背景情况:
- 氧醇衍生物在天然产品和药品中普遍存在.
- 螺旋环化合物的高效合成仍然是有机化学的一个挑战.
研究的目的:
- 开发一种用于合成螺旋cyclopropyl oxindoles的新型催化级联反应.
- 探索C(sp3) -H激活在构建复杂的氧化支架中的实用性.
主要方法:
- ((0)) -催化赫克/C ((sp3) -H激活级联反应.
- 作为起始材料使用了正经烯胺.
- 研究了微波辐射以加速反应时间.
主要成果:
- 通过非传统的四个成员的拉循环中间体,获得了高产的螺旋cyclopropyl oxindoles.
- 证明了广泛的基质范围和高效率,具有低催化剂负载 (0.5 mol %).
- 成功地将螺旋cyclopropanation与 [3 + 2] 循环添加结合在一起,产生螺旋pyrrolidine oxindoles.
结论:
- 建立了一种通用和高效的Pd(0) 催化方法来合成螺旋cyclopropyl oxindoles.
- 开发的战略为制备复杂的类化合物提供了一条有价值的途径,例如 (±) - 马素和 (±) - 胆素.
- 突出了级反应中C(sp3)-H激活的潜力,用于构建复杂的分子架构.
相关概念视频
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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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