在Pyrazolo[1,5-a]pyrimidines的区域选择性C-H Thio-和单化过程中
Paramita Pattanayak1, Harshil Khandelwal1, Shreeja Basappa1
1Department of Chemistry, Birla Institute of Technology & Science, Pilani, Hyderabad Campus Jawahar Nagar, Kapra Mandal, Hyderabad, 500078, Telangana, India.
这项研究引入了一种新的无金属方法,用于使用N-糖胺 (NCS) 的Pyrazolo[1,5-a]pyrimidines的C-H硫酸和酸. 有效反应在温和条件下进行,产生各种功能化的pyrazolo[1,5-a]pyrimidines.
科学领域:
- 有机化学 有机化学
- 异环化学 异环化学
- 合成方法论 合成方法论
背景情况:
- 皮拉佐罗[1,5-a]胺是具有多种生物活动的重要异环基架.
- 功能化这些核心结构的高效方法对于药物发现和材料科学至关重要.
- 以前用于Pyrazolo[1,5-a]pyrimidines的C-H功能化的策略在范围或效率方面存在限制.
研究的目的:
- 开发一种新的,无金属的协议,用于区域选择性C-H硫酸化和酸化Pyrazolo[1,5-a]pyrimidines.
- 建立一种温和,高效,可扩展的合成途径,以获取新型功能化的pyrazolo[1,5-a]pyrimidines.
- 为了研究C-H化的可行性,这在这个支架上以前没有被探索过.
主要方法:
- 使用N-糖胺 (NCS) 作为C-H功能化的调解剂.
- 使用硫酸盐 (KSCN) 进行硫化和硫酸盐 (KSeCN) 进行硫化.
- 在温和条件下进行反应,包括环境温度和有氧大气.
主要成果:
- 实现了高效和区域选择性的C-H硫酸化和酸化,并对Pyrazolo[1,5-a]pyrimidines进行了化.
- 首次成功合成了新型的3 - 氨酸二醇[1,5-a] 胺酸.
- 获得各种各样的功能化产品,具有良好的至优良的产量,具有广泛的基板范围和高功能组耐受性.
结论:
- 开发的NCS介导方法为C-H硫酸化提供了比以前的光催化策略更好的替代方案.
- 该协议提供了一种简单且前所未有的途径,在Pyrazolo[1,5-a]pyrimidine核心上形成C-SeCN键.
- 反应是可扩展的,表现出高的功能群耐受性,并允许合成多样化,使其对药物化学和有机合成有价值.
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