Highly selective synthesis of (<i>E</i>)-alkenyl-(pentafluorosulfanyl)benzenes through Horner–Wadsworth–Emmons reaction
作者:George Iakobson、Petr Beier
DOI:10.3762/bjoc.8.131
日期:——
fanyl)benzylphosphonates, available by the vicarious nucleophilic substitution reaction of meta- and para-nitro-(pentafluorosulfanyl)benzenes and diethyl chloromethylphosphonate, undergo Horner-Wadsworth-Emmons reaction with aldehydes in the presence of potassium hydroxide in acetonitrile at ambient temperature to give (E)-2-nitro-1-alkenyl-(pentafluorosulfanyl)benzenes in good yields and high stereoselectivities
2-硝基-(五氟硫烷基)苄基膦酸二乙酯,可通过间-和对-硝基-(五氟硫烷基)苯和氯甲基膦酸二乙酯的替代亲核取代反应获得,在乙腈中的氢氧化钾存在下与醛发生霍纳-沃兹沃思-埃蒙斯反应在室温下以良好的收率和高立体选择性得到 (E)-2-硝基-1-烯基-(五氟硫烷基)苯。主要产品的后续转化提供了 (E)-1-烯基-(五氟硫烷基)苯和 2-(2-芳乙基)-(五氟硫烷基)苯胺。