Manganese-Catalyzed [3 + 2] Cyclization of Ketones and Isocyanates via Inert C–H Activation
作者:Jiaqi Huo、Yunhui Yang、Congyang Wang
DOI:10.1021/acs.orglett.1c00857
日期:2021.5.7
manganacycles with isocyanates were first reported by Kaesz and Liebeskind in 1975 and 1990, respectively. The buildup of a closed manganese catalytic cycle for the reaction of ketones and isocyanates remains an unsolved problem. Herein, an unprecedented trio of Me2Zn/AlCl3/AgOTf is developed to build up manganese catalysis, which enables the [3 + 2] cyclization of ketones with isocyanates via inert C–H
Kaesz和Liebeskind分别于1975年和1990年首次报道了芳族酮的化学计量的环氧化锰以及由此形成的甘环与异氰酸酯的进一步反应。酮和异氰酸酯反应的封闭锰催化循环的建立仍然是一个未解决的问题。在此,开发出了前所未有的三元组Me 2 Zn / AlCl 3 / AgOTf,以建立锰催化作用,这使得酮与异氰酸酯的[3 + 2]环化反应通过惰性的C–H活化作用可以直接获得3-亚烷基邻苯二甲酰亚胺。其他过渡金属催化剂无法实现的方法。