A process for obtaining 2'-halo-4-methylbiphenyls is described, which comprises reacting 4-halotoluene with a 1,2-dihalobenzene in the presence of elemental metal such as magnesium, lithium or zinc, wherein 0 to 0.9 molar, particularly 0 to 0.2 molar excess of 4-halotoluene in regard to 1,2-dihalobenzene is used, and arised organometal intermediates are quenched by elemental halogen. In addition, the coupling of arised 2'-halo-4-methylbiphenyls with 2-(1-propyl)-4-methyl-6-(1'-methylbenzimidazole-2-il)benzimidazole to afford 3'-(2'-halo-biphenyl-4-ylmethyl)-1,7'-dimethyl-2'-propyl-1H,3'H-[2,5']bibenzoimidazolyl, which can be further converted to organometallic compound and said organometallic compound is further reacted with formic acid derivative, such as N,N-dimethylformamide, alkylformiate or carbon dioxide to obtain telmisartan, is also described. Further described is use of in line analytics for monitoring the aforementioned reactions.
本文描述了一种制备2'-卤代-
4-甲基联苯的方法,其中在元素
金属(例如
镁、
锂或
锌)存在下,将4-卤代
甲苯与1,2-二卤代苯反应,使用0至0.9摩尔,特别是0至0.2摩尔的4-卤代
甲苯超量,产生的有机
金属中间体通过元素卤素淬灭。此外,将产生的2'-卤代-
4-甲基联苯与2-(1-丙基)-4-甲基-6-(1'-甲基
苯并咪唑-2-基)
苯并咪唑偶联,得到3'-(2'-卤代
联苯基-4-基甲基)-1,7'-二甲基-2'-丙基-1H,3'H-[2,5']联
苯并咪唑基,可进一步转化为有机
金属化合物,该有机
金属化合物进一步与
甲酸衍
生物(如
N,N-二甲基甲酰胺、烷基
甲酸盐或
二氧化碳)反应,制备得到
替米沙坦。此外,本文还描述了在线分析用于监测上述反应的使用。