Copper-Catalyzed Aerobic 6-Endo-Trig Cyclization of β,γ-Unsaturated Hydrazones for the Divergent Synthesis of Dihydropyridazines and Pyridazines
作者:Zhenwei Fan、Zhangjin Pan、Liangsen Huang、Jiajia Cheng
DOI:10.1021/acs.joc.9b00228
日期:2019.4.5
A divergent synthetic strategy to 1,6-dihydropyridazines and pyridazines through Cu(II)-catalyzed controllable aerobic 6-endo-trig cyclization was developed. The selectivity can be rationally tuned via the judicious choice of reaction solvent. It was found that the 1,6-dihydropyridazines were obtained in moderate to high yields with CH3CN as the reaction solvent, whereas employment of AcOH directly
通过Cu(II)催化可控的好氧6-endo-trig环化反应,开发了一种合成1,6-二氢哒嗪和哒嗪的合成策略。可以通过明智地选择反应溶剂来合理地调节选择性。已经发现,以CH 3 CN作为反应溶剂可以中等至高收率获得1,6-二氢哒嗪,而使用AcOH直接以高达92%的收率获得哒嗪,这可能是由于原位生成的氧化所致。 1,6-二氢哒嗪。