Addition of a variety of 1,3-dicarbonyl derivatives to conjugated nitroalkenes was efficiently performed under heterogeneous catalysis by acidic alumina in the presence of a minimum amount of solvent (Et2O, 0.5 mL/mmol). The procedure allows satisfactory to good yields of a diastereomeric mixture (Ë1:1) of polyfunctionalized adducts. Moreover, work-up can be avoided since the reaction mixture can be directly charged into a chromatographic column for immediate purification.
在酸性氧化铝的异相催化下,在最低溶剂用量(Et2O,0.5 mL/mmol)的存在下,多种 1,3-二羰基衍
生物与共轭硝基烯的加成反应得以高效进行。该方法可以获得令人满意的多官能团化加合物非对映混合物(Ë1:1)。此外,由于反应混合物可直接进入色谱柱进行即时纯化,因此可以避免返工。