Reductive Cyclizations of Nitroarenes to Hydroxamic Acids by Visible Light Photoredox Catalysis
摘要:
We have developed a photocatalytic reduction of nitroarenes as an efficient, chemoselective route to biologically important N-phenyl hydroxamic acid scaffolds. Optimal conditions call for 2.5 mol% of a ruthenium photocatalyst, visible light irradiation, and a dihydropyridine terminal reductant. Because of the mild nature of the visible light activation, functional groups that might be sensitive to other non-photochemical reduction methods are easily tolerated.
Reductive Cyclizations of Nitroarenes to Hydroxamic Acids by Visible Light Photoredox Catalysis
摘要:
We have developed a photocatalytic reduction of nitroarenes as an efficient, chemoselective route to biologically important N-phenyl hydroxamic acid scaffolds. Optimal conditions call for 2.5 mol% of a ruthenium photocatalyst, visible light irradiation, and a dihydropyridine terminal reductant. Because of the mild nature of the visible light activation, functional groups that might be sensitive to other non-photochemical reduction methods are easily tolerated.
Deconstructive di-functionalization of unstrained, benzo cyclic amines by C–N bond cleavage using a recyclable tungsten catalyst
作者:Yujing Zhang、Shuai Sun、Yijin Su、Jian Zhao、Yong-Hong Li、Bo Han、Feng Shi
DOI:10.1039/c9ob00693a
日期:——
the C–N bond in unstrained, benzo cyclic amines to generate an ester group and nitro group simultaneously. The preliminary mechanistic studies suggested that the corresponding hydroxamicacid is the key intermediate for this transformation. Importantly, with the utilization of this transformation, we achieved an interesting approach for the ring contraction of quinoline to indole, an example of scaffold
以H 2 WO 4为催化剂,H 2 O 2为氧化剂,我们在本文中报道了在未应变的苯并环胺中C–N键的解构二官能化,可同时生成酯基和硝基。初步的机理研究表明,相应的异羟肟酸是该转化的关键中间体。重要的是,利用这种转化,我们实现了一种有趣的方法,将喹啉环缩为吲哚,这是杂芳族体系中支架跳跃的一个例子。