Here we report a silver-mediated trifluoromethoxylation of (hetero)aryldiazonium tetrafluoroborates by converting an aromatic amino group into an OCF3 group. This method, which can be considered to be a trifluoromethoxylation variation of the classic Sandmeyer-type reaction, uses readily available aryl and heteroaromatic amines as starting materials and AgOCF3 as trifluoromethoxylating reagents. The
electron poor aromatics (α,α,α-trifluoro-toluene, toluene, benzene, chloro-benzene, methoxybenzene) has been investigated. The possibility of selectively bind the trifluoro-methoxy group (via radical mechanism) or the fluorine atom (via electrophilic addition) by varying the reaction conditions has been explored. In particular we have observed that the trifluoro-methoxy free radical substitution can be the
on of arynes has been little reported in the literature mainly due to the limited number of stable trifluoromethoxide anion sources existing. We describe herein the trifluoromethoxylation of arynes using 2,4-dinitro-1-(trifluoromethoxy)benzene (DNTFB) as a cheap and easy-to-use source of F3CO−. The released trifluoromethoxide anion was used as both a source of fluoride to generate the aryne and a nucleophile
芳烃的三氟甲氧基化在文献中报道很少,这主要是由于现有的稳定的三氟甲氧基阴离子源的数量有限。我们在此描述了使用 2,4-二硝基-1-(三氟甲氧基)苯 (DNTFB) 作为廉价且易于使用的 F 3 CO − 来源的芳烃的三氟甲氧基化。释放的三氟甲氧基阴离子既用作产生芳基的氟化物源,又用作三氟甲氧基化反应的亲核试剂。
FEIRING A. E., J. ORG. CHEM., 1979, 44, NO 16, 2907-2910