反应详情

As shown in Scheme 2, the sequential treatment of 2-hydroxy-5-nitropyridine with potassium chlorate under heated conditions provides 3-chloro-2-hydroxy-5-nitropyridine which when further treated with phosphorous oxychloride under heated conditions provides 2,3-dichloro-5-nitropyridine. The nitro containing compound when treated to the reductive conditions of Raney-nickel and 40 PSI of hydrogen provides the amine which when further treated with glyoxal-1,2-dimethyl acetal in the presence of Raney-nickel under heated condition provides (5,6-dichloro-pyridin-3-yl)-(2,2-dimethoxy-ethyl)-amine. The amine when treated with allyl bromide and methyl tributyl ammonium chloride in a mixture of methyl tert-butyl ether and 50% aqueous sodium hydroxide provides allyl-(5,6-dichloro-pyridin-3-yl)-(2,2-dimethoxy-ethyl)amine (Compound 6E).