Schlosser, ManfredGorecka, JoannaCastagnetti, Eva2006-03-032006-03-032006-03-03200310.1002/ejoc.200390079https://infoscience.epfl.ch/handle/20.500.14299/227008WOS:0001808051000073743The conversion of 2,2-difluoro-1,3-benzodioxole, an exceptionally acidic arene, via a 4-lithiated intermediate into more than three dozen new derivs. was conceived as a case study. The lithiated species was trapped by C0-electrophiles (4-toluenesulfonyl azide, fluorodimethoxyborane, iodine), C1-electrophiles (carbon dioxide, N,N-dimethylformamide, formaldehyde, di-Me sulfate), C2-electrophiles (oxalic acid diesters, oxirane), C3-electrophiles (oxetane), and higher alkyl iodides. The resulting carboxylic acid 2,2-difluoro-1,3-benzodioxole-4-carboxylic acid may be treated with organolithium compds. to afford ketones and the aldehyde 2,2-difluoro-1,3-benzodioxole-4-carboxaldehyde may be condensed with nitromethane or acetic anhydride under basic conditions. If not oxidized with chromium trioxide to the corresponding carboxylic acids, the alcs., e.g., 4-(3-hydroxypropyl)-2,2-difluoro-1,3-benzodioxole can be transformed into the corresponding bromides or sulfonates. Their condensation with nitrogen-contg. C0-nucleophiles (hydroxylamine, sodium azide, potassium phthalimide), C1-nucleophiles (potassium cyanide), and C2-nucleophiles (acetonitrile) opens a convenient access to amines. Other reactions gave, despite a proven track record in other areas, only moderate yields. [on SciFinder (R)]Electrophiles (carbon; prepn. of functionalized 22-difluoro-13-benzodioxoles by reactions of 4-lithiated intermediate with carbon electrophiles and nitrogen nucleophiles); Nucleophiles (nitrogen; prepn. of functionalized 22-difluoro-13-benzodioxolesdifluorobenzodioxole lithiation reaction carbon electrophile nitrogen nucleophile; benzodioxole difluoro lithiation reaction carbon electrophile nitrogen nucleophile2-difluoro-1text::journal::journal article::research article