Regiodivergent Cross-Dehydrogenative Coupling of Pyridines and Benzoxazoles: Discovery of Organic Halides as Regio-Switching Oxidants
作者:Shuya Yamada、Kei Murakami、Kenichiro Itami
DOI:10.1021/acs.orglett.6b00932
日期:2016.5.20
regio-divergent heterocyclic CDCs is considered crucial. In this Letter, the unprecedented use of organic halides as an oxidant to achieve the CDC reaction of pyridines and benzoxazoles with palladium catalyst is described. Moreover, the regioselectivity of the pyridine functionalization site can be controlled by the choice of organic halides.
两种未官能化的杂芳烃的交叉脱氢偶联(CDC)已被认为是合成特权杂二芳基支架的理想转化。然而,除其他键外,特定的两个杂环CH键之间的区域选择性激活和转化一直是极富挑战性的。因此,发现新的控制元件以实现区域控制和区域发散的杂环CDC被认为是至关重要的。在这封信中,描述了前所未有地使用有机卤化物作为氧化剂来实现吡啶和苯并恶唑与钯催化剂的CDC反应。此外,可以通过选择有机卤化物来控制吡啶官能化位点的区域选择性。