available 4-nitro-(pentafluorosulfanyl)benzene through vicariousnucleophilic substitution of hydrogen (VNS) reaction, reduction of nitro group and cyclization of resulting anilines were described. Transformations of 5-SF5-indazoles led to a variety of SF5-substiuted heteroarenes that can serve as a versatile building block for diversity-oriented organic synthesis.
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 potassiumhydroxide in acetonitrile at ambient temperature to give (E)-2-nitro-1-alkenyl-(pentafluorosulfanyl)benzenes in good yields and high stereoselectivities