Preparation of SF<sub>5</sub> Aromatics by Vicarious Nucleophilic Substitution Reactions of Nitro(pentafluorosulfanyl)benzenes with Carbanions
作者:Petr Beier、Tereza Pastýříková、George Iakobson
DOI:10.1021/jo200618p
日期:2011.6.3
Vicariousnucleophilic substitutions (VNS) of hydrogen in 1-nitro-4-(pentafluorosulfanyl)benzene with carbanions provide 2-substituted 1-nitro-4-(pentafluorosulfanyl)benzenes in good to high yields. VNS of 1-nitro-3-(pentafluorosulfanyl)benzene gives a mixture of 6- and 4-substituted 1-nitro-3-(pentafluorosulfanyl)benzenes in 85:15 to >98:2 ratio and good to high yields. In basic media, the VNS reactions
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
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.