申请人:MERRELL DOW PHARMACEUTICALS INC.
公开号:EP0230144A1
公开(公告)日:1987-07-29
Reactions can be carried out at temperatures of -50°C or below with residence times of 1 minute or less using a novel low temperature, continuous flow-reactor system. The system comprises a closed tubular thermally conductive flow reactor (1) having at least two inlet ports (2) and an outlet port (17); respective fluid supply conduits (13,14) communicating with the inlet ports (12); a fluid outlet conduit (18) communicating with the outlet port (17); pump means (31,32) for controlling the flow of fluid through the flow reactor; and a cooling zone (25,26) accommodating the reactor (1). At least one of the fluid supply conduits (13,14) is thermally conductive and is coiled proximate to but spaced from said flow reactor (1) in the cooling zone. Preferably, the coiled portion of the fluid supply conduit is coiled around but spaced from the flow reactor.
Conveniently, the flow reactor has a right circular reaction chamber formed by a tubular main body having a circular recess closed by a cover plate.
The system is particularly useful for the production of ethyl 2,2-difluoro-4-pentenoate by the spontaneous rearrangement of 1,2,2-trifluorovinyl allyl ether in the presence of ethanol and for the production of 2-fluorinated methyl aminoacetonitriles by reaction of a fluorinated methyl ketimine magnesium halide salt with hydrogen cyanide, or aqueous ammonium cyanide, or an aqueous solution of an alkali metal cyanide and a proton source.
使用新型低温连续流动反应器系统,可以在-50°C 或更低的温度下进行反应,停留时间为 1 分钟或更短。该系统包括一个封闭的管状导热流动反应器 (1),该反应器至少有两个入口 (2) 和一个出口 (17);分别与入口 (12) 相通的流体供应导管 (13,14);与出口 (17) 相通的流体出口导管 (18);用于控制流过流动反应器的流体流量的泵装置 (31,32);以及容纳反应器 (1) 的冷却区 (25,26)。流体供应导管(13,14)中至少有一个是导热的,并且盘绕在冷却区内靠近所述流动反应器(1)但与之有一定间距的地方。流体供应导管的盘绕部分最好盘绕在流动反应器周围,但与流动反应器保持一定间距。
方便的是,流动反应器有一个由管状主体形成的右圆形反应室,管状主体上有一个由盖板封闭的圆形凹槽。
该系统特别适用于在乙醇存在下通过 1,2,2-三氟乙烯基烯丙基醚的自发重排生产 2,2-二氟-4-戊烯酸乙酯,以及通过氟化甲基酮亚胺卤化镁盐与氰化氢或氰化铵水溶液或碱金属氰化物水溶液和质子源反应生产 2-氟化甲基氨基乙腈。