Aminoketones are made by condensing phenolic ethers of the formula <;FORM:0684781/IV (b)/1>; with aminonitriles NC.CH2.NR3R4 in the presence of aluminium chloride and hydrogen chloride gas in an inert polar solvent and treating the product (amino-imine) with water; if desired, the groups R, R1 and R2 may then be replaced by hydrogen and/or the ketone reduced to the corresponding secondary alcohol; if the aminonitrile is used in the form of its hydrochloride or other inorganic salt the hydrogen chloride gas may be omitted; R, R1 and R2 are alkyl or aralkyl; R3 and R4 are hydrogen, alkyl or aralkyl or form a ring with the nitrogen atom. Suitable inert polar solvents are nitrobenzene, o-nitrotoluene and o-nitroanisole. The conversion of the ether groups into free phenolic groups may occur during formation or reduction of the ketone, particularly if catalytic hydrogenation is used for the latter step. In the examples, the following products are made: (1) adrenalone monobenzyl ether from catechol dibenzyl ether and methylamino-acetonitrile; (2) 3 : 4-dimethoxy-o -methylamino-acetophenone from veratrole and methylamino-acetonitrile; (3) 3 : 4-dimethoxy-o -isopropyl-aminoacetophenone, 3 : 4-dimethoxy - o - aminoacetophenone, 3 : 4 - dimethoxy - o - diethylamino - acetophenone and 3 : 4-dimethoxy-o -benzylmethylamino-acetophenone similarly; (4) 2 : 4- and 2 : 5-dimethoxy-o -methylamino-acetophenone from the dimethyl ethers of resorcinol and hydroquinone respectively; (5) 2 : 3 : 4-, 2 : 4 : 5- and 2 : 4 : 6-trimethoxy - o - methylamino - acetophenone from the trimethoxybenzenes; (6) 3 : 4-dihydroxy-o -methylamino - acetophenone and 3 : 4 - dihydroxy - o - isopropylamino - acetophenone by hydrolysis of their dimethyl ethers; (7) 1-(3 : 4-dimethoxyphenyl)-2-methylamino-ethanol and 1 - (3 : 4 - dimethoxyphenyl) - 2 - isopropylaminoethanol by catalytic hydrogenation of the corresponding ketones. The products are usually obtained as hydrochlorides. Specification 640,492 is referred to.;FORM:0684781/IV>
氨基酮是通过在惰性极性溶剂中存在氯化铝和氯化氢气的情况下,将公式为<;FORM:0684781/IV(b)/1>;的酚醚与氨基腈NC.CH2.NR3R4缩合制得,并将产物(氨基亚胺)与水处理而制得;如果需要,可以用氢替换R、R1和R2基团,或将酮还原为相应的二级醇;如果使用氨基腈的盐酸盐或其他无机盐形式,则可以省略氯化氢气;R、R1和R2是烷基或芳基;R3和R4是氢、烷基或芳基,或与氮原子形成环。适用的惰性极性溶剂有硝基苯、邻硝基甲苯和邻硝基苯甲醚。醚基转化为自由酚基可能发生在酮的形成或还原过程中,特别是如果在后一步骤中使用催化氢化。在示例中,制备了以下产品:(1)从邻苯二甲醚和甲基氨基乙腈制得肾上腺醇单苄醚;(2)从芳香二甲醚和甲基氨基乙腈制得3:4-二甲氧基-邻-甲基氨基苯乙酮;(3)类似地制备了3:4-二甲氧基-邻-异丙基氨基苯乙酮、3:4-二甲氧基-邻-氨基苯乙酮、3:4-二甲氧基-邻-二乙基氨基苯乙酮和3:4-二甲氧基-邻-苄基甲基氨基苯乙酮;(4)分别从间苯二甲醚和对苯二酚的二甲醚制备了2:4-和2:5-二甲氧基-邻-甲基氨基苯乙酮;(5)从三甲氧基苯制备了2:3:4-、2:4:5-和2:4:6-三甲氧基-邻-甲基氨基苯乙酮;(6)通过水解它们的二甲醚制备了3:4-二羟基-邻-甲基氨基苯乙酮和3:4-二羟基-邻-异丙基氨基苯乙酮;(7)通过对应酮的催化氢化制备了1-(3:4-二甲氧基苯基)-2-甲基氨基乙醇和1-(3:4-二甲氧基苯基)-2-异丙基氨基乙醇。通常以盐酸盐的形式获得这些产品。参考规范640,492。