通过应变释放合并基基化学和基boration:单多元组件获取到无菌拥挤的子功能化的机器borons
Aiswarya Mini1, Het Vyas1, Ashvin J Gangani1
1Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States.
Organic letters
|March 18, 2025
概括
我们开发了一种新的单反应,用于使用二博激活的环基合成功能化的环基. 这种方法有效地创建了具有多个立体中心和有用的功能组的复杂分子.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
背景情况:
- 环基 (CPK) 的基介导反应通常会产生具有有限立体化学复杂性的环.
- 现有的方法需要特定的激活组,并导致非相邻的立体中心.
研究的目的:
- 开发一种新的合成策略,以获取功能密集的环烯.
- 为了增加分子复杂性,将基基化学与基化合并.
主要方法:
- 一种单多组分反应,涉及二博激活的CPK,和化物.
- 利用了基生成和随后的化.
主要成果:
- 实现了功能化环烯的高度二聚体选择性合成.
- 在相邻的立体中心上引入了同质醇,和基酸的图案.
- 合成的罕见子功能化γ,γ-异位化基二子.
结论:
- 开发的方法可以有效地访问复杂的环烯结构.
- 在多元组件反应中证明了二博激活的CPK的实用性.
- 扩大了基化学和基化工的范围.
相关概念视频
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
17.7K
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.
17.7K
Radical Substitution: Allylic Bromination
4.9K
In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formedÃÂÃÂ when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperaturesÃÂÃÂ to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be...
4.9K
Regioselectivity and Stereochemistry of Hydroboration
8.0K
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...
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...
8.0K
Hydroboration-Oxidation of Alkenes
7.7K
In addition to the oxymercurationâÃÂÃÂdemercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a BâÃÂÃÂH bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
7.7K
Preparation of Alcohols via Addition Reactions
6.1K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.1K
Aldol Condensation with β-Diesters: Knoevenagel Condensation
2.9K
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as ÃÂò-diesters to produce substituted olefins.
2.9K


