H-Bonding Organocatalysed Friedel-Crafts Alkylation of Aromatic and Heteroaromatic Systems with Nitroolefins
作者:Raquel P. Herrera、Alfredo Ricci、Gabriella Dessole
DOI:10.1055/s-2004-832844
日期:——
Catalytic amounts (10 mol%) of bis-arylureas and -thioureas promote the Friedel-Crafts alkylation with nitroolefins of aromatic and heteroaromatic N-containing derivatives. A sizeable improvement of the yields is noticed on running the reactions in the absence of solvent. When applied to indoles this protocol provides in good to excellent yields and with high selectivity the corresponding Michael adducts
双芳基脲和硫脲的催化量 (10 mol%) 促进了与芳香族和杂芳香族含 N 衍生物的硝基烯烃的 Friedel-Crafts 烷基化。在不存在溶剂的情况下进行反应时,注意到产率有相当大的提高。当应用于吲哚时,该协议提供了良好的产率和高选择性的相应迈克尔加合物。将无溶剂反应条件与微波 (MW) 辐射相结合,可以实现 3-甲基吲哚 2 位的烷基化。