Oxidative Cycloaddition of Aldoximes with Maleimides using Catalytic Hydroxy(aryl)iodonium Species
作者:Akira Yoshimura、Khiem C. Nguyen、Gregory T. Rohde、Akio Saito、Mekhman S. Yusubov、Viktor V. Zhdankin
DOI:10.1002/adsc.201600331
日期:2016.7.14
A mild catalytic procedure for the efficient oxidative cyclization of aldoximes with maleimides mediated by hypervalentiodine(III) active species has been developed. This catalytic cyclization affords the corresponding pyrrolo‐isoxazole products in generally good yields. The catalytic cycle involves active hydroxy(aryl)iodonium speciesgenerated in situ from 2‐iodobenzoic acid as precatalyst and m
已经开发了一种温和的催化程序,用于由高价碘(III)活性物质介导的具有马来酰亚胺的醛肟的有效氧化环化反应。这种催化环化反应通常可以提供高收率的相应吡咯并异唑产品。催化循环涉及在三氟甲磺酸存在下,由2-碘苯甲酸作为前催化剂和间氯过氧苯甲酸(m- CPBA)作为末端氧化剂原位生成的活性羟基(芳基)碘鎓。ESI-质谱和1 H NMR光谱证实了该反应中存在活性羟基(芳基)碘鎓物质。
cycloaddition reaction was developed for the expedient synthesis of pharmacologically interesting 3-aryl substituted isoxazolines and isoxazoles through C[double bond, length as m-dash]C bond cleavage. Copper nitrate is employed as a reaction promoter and precursor of nitrile oxides. The given approach features a new mode of cycloaddition from olefinic azlactones, copper nitrate and unsaturated compounds