申请人:Sumitomo Chemical Company, Limited
公开号:US05597941A1
公开(公告)日:1997-01-28
The process for producing 5-amino-3-methylpyrazole includes the steps of reacting 2,3-dichloropropene with a cyanogenating agent in the presence of a cuprous salt and water at a pH of 3-8 to obtain at least one intermediate selected from the group consisting of 3-chloro-3-butenonitrile and 2,3-butadienenitrile; reacting the at least one intermediate with a base in the presence of water at a pH of 12.5 or above to obtain 2-butynenitrile; and reacting the 2-butynenitrile with hydrazine. This process is advantageous in that it enables the production of 5-amino-3-methylpyrazole in high yield without using any reagent which may produce fire. 5-Amino-3-methylpyrazole is a useful intermediate for medicines, agricultural chemicals, photographic chemicals, etc.
生产5-氨基-3-甲基吡唑的过程包括以下步骤:在存在铜盐和水的pH值为3-8的条件下,将2,3-二氯丙烯与氰化剂反应,以获得选择自3-氯-3-丁烯腈和2,3-丁二烯腈的至少一个中间体;在水的存在下,在pH值为12.5或以上的条件下,将至少一个中间体与碱反应,以获得2-丁炔腈;然后将2-丁炔腈与肼反应。该过程的优点在于,它可以在不使用任何可能产生火灾的试剂的情况下高产得到5-氨基-3-甲基吡唑。5-氨基-3-甲基吡唑是一种有用的医药、农药、照相化学品等中间体。