Preparation of 4-substituted imidazoles from
N-formyl-.alpha.-aminonitrile
    3.
    发明授权
    Preparation of 4-substituted imidazoles from N-formyl-.alpha.-aminonitrile 失效
    从N-甲酰基-α-氨基腈制备4-取代的咪唑

    公开(公告)号:US5359082A

    公开(公告)日:1994-10-25

    申请号:US36032

    申请日:1993-03-23

    摘要: A process for the preparation of 4-substituted imidazoles of the general formula ##STR1## in which R denotes C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, aryl, and C.sub.7 -C.sub.20 aralkyl,whereina) N-formyl-.alpha.-aminonitriles of the general formula I ##STR2## in which R has the meanings stated above and A stands for carbonyl, are reacted, at a temperature ranging from 20.degree. to 200.degree. C. and a pressure ranging from 20 to 500 bar, with hydrogen in the presence of hydrogenation catalysts andb) the resulting N-formyl-1,2-diamines of the general formula ##STR3## in which R and A have the meanings stated above and n stands for 0 or 1, are reacted over a cyclization/dehydrogenation catalyst at a temperature ranging from 200.degree. to 600.degree. C. and a pressure ranging from 0.001 to 5 bar.

    摘要翻译: 制备通式为(I)的4-取代咪唑的方法,其中R表示C 1 -C 20烷基,C 3 -C 20环烷基,芳基和C 7 -C 20芳烷基,其中a)N-甲酰基-α 其中R具有上述含义并且A代表羰基的通式I (II)的氨基腈在20℃至200℃的温度和20至500℃的压力下反应 在氢化催化剂的存在下用氢气b)所得的通式(III)的N-甲酰基-1,2-二胺其中R和A具有上述含义,n代表0或 1在环化/脱氢催化剂上在200至600℃的温度和0.001至5巴的压力下反应。