从糖醇中合成2,3-不和O-烯糖化物的立体选择性合成,使用Tris(pentafluorophenyl) 作为催化剂
Sankar Sau1, Nishant Mishra1, Anjali Aghi1
1Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India.
Carbohydrate research
|July 8, 2025
概括
本研究介绍了一种无金属的方法,用于合成α-O-aryl糖化物,使用tris(pentafluorophenyl) (BCF) 催化剂. 该过程有效地从具有挑战性的起始材料中产生具有高α选择性的有价值的不和糖化物.
科学领域:
- 有机化学 有机化学
- 葡萄糖酶化化学 化学 葡萄糖酶化化学
- 催化剂是一种催化剂.
背景情况:
- 对药物化学和材料科学而言,O-aryl糖化物的合成至关重要.
- 开发高效和立体选择性糖基化方法仍然是一个重大挑战,特别是在电子缺乏基质的情况下.
- 无金属的催化系统对于可持续的化学合成是非常理想的.
研究的目的:
- 开发一种新的,立体选择性方法来合成2,3-不和α-O-aryl糖化物.
- 为了利用三 (pentafluorophenyl) (BCF) 作为糖化反应的有效催化剂.
- 在无金属条件下使用具有挑战性的基板来实现高产量和独特的α-anomeric选择性.
主要方法:
- 采用三 (pentafluorophenyl) (BCF) 作为一个催化剂,用于解除糖醇和之间的反应.
- 优化反应条件,以实现无金属糖化.
- 研究与各种甘氨基基捐赠体和接受体发生反应的范围.
主要成果:
- 成功的立体选择合成2,3-不和α-O-aryl糖化物.
- 通过独特的α-anomer选择性获得良好的至优秀的产量.
- 证明了催化剂能够激活缺乏电子的甘醇和的能力.
- 扩展了扩大规模和进一步衍生化的方法.
结论:
- 三 (pentafluorophenyl) (BCF) 是一种最佳的催化剂,用于α-O-aryl糖化物的立体选择性合成.
- 开发的无金属方法提供了一条强大而有效的途径,以获得有价值的糖化化合物.
- 这种方法为访问复杂的碳水化合物衍生品提供了一个多功能平台.
相关概念视频
03:08Hydroboration-Oxidation of Alkenes
9.0K
In addition to the oxymercuration–demercuration 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 B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
9.0K
02:36Regioselectivity and Stereochemistry of Hydroboration
8.4K
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...
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...
8.4K
02:15Preparation of Alcohols via Addition Reactions
6.4K
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...
6.4K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.8K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.8K
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
18.9K
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.
18.9K
01:14Alkylation of β-Diester Enolates: Malonic Ester Synthesis
3.6K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
3.6K