申请人:The Upjohn Company
公开号:US03992400A1
公开(公告)日:1976-11-16
Compounds of the formulae IV and V: ##SPC1## wherein R.sub.0 and R.sub.1 are hydrogen or alkyl of 1 to 3 carbon atoms, inclusive; wherein R.sub.2 is hydrogen, fluoro, chloro, or trifluoromethyl; wherein R.sub.3 is hydrogen or fluoro with the proviso that R.sub.3 cannot be fluoro, if R.sub.2 is chloro or trifluoromethyl; and wherein R.sub.4 is hydrogen, fluoro, chloro, bromo, trifluoromethyl, or nitro, are obtained by a multi-step reaction from the corresponding .alpha.-(phenyl)-o-toluidine of the formula I: ##SPC2## wherein R.sub.2, R.sub.3, and R.sub.4 are defined as above, by treating I in sequence with an alkyl ester of orthoformic acid the resulting product with 2-alkyl-2-(aminoalkyl)-1,3-dioxolane or a 2-amino-alkanone dialkyl ketal and finally with titanium tetrachloride to obtain compound IV, and oxidizing compound IV to obtain the corresponding compound V. Compounds IV and V have minor tranquilizing activity which can be utilized to calm mammals or birds. Their more important use, however, is as intermediates in the production of the strongly sedating and tranquilizing imidazolobenzodiazepines.
公式IV和V的化合物:##SPC1##其中R.sub.0和R.sub.1是1至3个碳原子的氢或烷基;其中R.sub.2是氢,氟,氯或三氟甲基;其中R.sub.3是氢或氟,但是如果R.sub.2是氯或三氟甲基,则R.sub.3不能是氟;其中R.sub.4是氢,氟,氯,溴,三氟甲基或硝基。通过从公式I的相应α-(苯基)-o-甲基苯胺进行多步反应,可以获得这些化合物:##SPC2##其中R.sub.2,R.sub.3和R.sub.4如上所定义,依次用正甲酸烷基酯处理I,然后用2-烷基-2-(氨基烷基)-1,3-二氧兰或2-氨基-烷酮二烷基酯处理产物,最后用四氯化钛处理以获得化合物IV,并氧化化合物IV以获得相应的化合物V。化合物IV和V具有轻微的镇静作用,可用于使哺乳动物或鸟类镇静。然而,它们更重要的用途是作为生产强烈的镇静催眠咪唑苯并二氮平的中间体。