Oxidative Biaryl Coupling Reaction of Phenol Ether Derivatives Using a Hypervalent Iodine(III) Reagent
摘要:
The hypervalent iodine(III)-induced intramolecular biaryl coupling reaction of phenol ether derivatives (nonphenolic derivatives) was investigated with the aim of preparing various dibenzo heterocyclic compounds. 1,3-Diarylpropanes (1a-e), N-benzyl-N-phenethylamines (2a-c) and N,N-dibenzylamines (3a-e) react with a hypervalent iodine reagent, phenyliodine(III) bis(trifluoroacetate) (PIFA), containing BF3. Et2O in CH2Cl2 to give the biaryl coupling products (4-6) in good yield. As an application of the reaction, we examined the synthesis of oxygen- and sulfur-containing dibenzoheterocyclic compounds (12-15), whose side chain moiety could be easily cleaved by the known method to give 2,2'-substituted biphenyl compounds (16-18).
There is provided in accordance with an embodiment of the disclosure a spray-on composition for the treatment and prevention of insect or arachnid infestation on a mammal comprising between 0.1% and 1.0% by weight dinotefuran. There is also provided in accordance with an embodiment of the disclosure a method for treatment of an animal at risk of insect or arachnid infestation comprising topically administering to the coat of the animal a composition comprising between 1 and 50 mg dinotefuran per kilogram of animal weight. Optionally, topically administering includes spraying on a majority of the area of the coat of the animal.