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相关概念视频

Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

9.4K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
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Oxymercuration-Reduction of Alkenes02:36

Oxymercuration-Reduction of Alkenes

9.3K
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
9.3K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.4K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.4K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.8K
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).
2.8K
Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

7.6K
The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
7.6K
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

3.4K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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核心多样化使用1,2-oxaborines作为一个多功能分子平台.

Yao Ge1, Qi Zhu1, Yongqi Zhu1

  • 1Department of Chemistry, University of Chicago, Chicago, IL, USA.

Nature chemistry
|October 9, 2025
PubMed
概括
此摘要是机器生成的。

这项研究介绍了1,2-oxaborines作为药物发现的多功能平台,使各种分子核心的快速合成. 这种新方法简化了创建新药类型的新方法,避免了繁重的 de novo 合成.

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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

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科学领域:

  • 有机化学 有机化学
  • 药用化学 医学化学
  • 合成化学 合成化学

背景情况:

  • 药物发现通常需要合成具有不同核心结构的多种类型的类似物.
  • 这些类型的传统 de novo 合成是耗时和劳动密集的.

研究的目的:

  • 开发一种新且高效的战略,以快速获取药物发现中多样化的核心结构.
  • 为了利用1,2-oxaborines作为一个多功能分子平台用于核心多样化.

主要方法:

  • 一种软化/6π-电循环化策略被开发出来,用于高效地从或中合成1,2-oxaborine.
  • 1,2-oxaborines经历了C-H功能化和随后的转化.
  • 进行了一种常见中间产品的后期多样化.

主要成果:

  • 为快速合成多样化的分子核而建立了一个多功能1,2-oxaborine平台.
  • 1,2-oxaborines表现出多方面的反应性,使其能够转化为各种芳香,异芳香和非芳香的异环.
  • 该策略允许在后期阶段制备具有多种芳香核的类似物,包括含有Lipitor替代剂的类似物.

结论:

  • 基于1,2-oxaborine的核心多样化策略为传统的de novo合成提供了一个有效的替代方案.
  • 这种方法可以快速获得广泛的新型化学实体,用于药物发现.
  • 该方法在加速识别新药候选者的过程中具有显著的潜力.