申请人:Merrell Dow Pharmaceuticals Inc.
公开号:US04847401A1
公开(公告)日:1989-07-11
The large scale preparation of ethyl 2,2-difluoro-4- pentenoate and 2-fluorinated methyl aminoacetonitriles by reaction of 2-H-perfluoroethyl allyl ether and n-butyl lithium and fluoromethylacetonitrile and a Grignard reagent, respectively, is largly unsuccessful because of side reactions which convert intermediate products and reactants to undesired products. Applicants have overcome these problems by performing the reactions with cooling in a continuous manner in a flow reactor with short residence time.
通过使用2-H-全氟乙基烯丙醚和正丁基锂以及氟甲基乙酰腈和格氏试剂分别反应制备乙酸2,2-二氟-4-戊烯酯和2-氟甲基氨基乙腈的大规模制备通常不成功,因为副反应会将中间产物和反应物转化为不需要的产物。申请人通过在短停留时间的流动反应器中进行冷却连续反应来克服这些问题。