申请人:Relypsa, Inc.
公开号:US10138198B2
公开(公告)日:2018-11-27
The present disclosure generally relates to processes for converting acrylate esters or a derivative thereof to difluoropropionic acid or a derivative thereof. This process is generally performed using fluorine gas in a hydrofluorocarbon solvent. In particular, a continuous process for fluorinating a double bond is disclosed, the process comprising forming a reaction stream comprising a compound of formula 1 or formula 5 dissolved in a hydrofluorocarbon or fluorocarbon solvent,
wherein R1 is hydroxy, alkoxy, chloro, or —OC(O)CH═CH2; the reaction stream flowing through a continuous fluorination reactor at a flow rate of from about 0.2 mL/minute to about 2 mL/minute and fluorine gas flows through the continuous fluorination reactor at a gas flow rate of from about 0.2 mmol/minute to about 2 mmol/minute; whereby reaction of the compound of formula 1 or formula 5 with the fluorine gas forms a compound of formula 2 or formula 6
wherein R2 is hydroxy, alkoxy, chloro, or —OC(O)CHFCH2F.
本公开内容一般涉及将丙烯酸酯或其衍生物转化为二氟丙酸或其衍生物的工艺。该工艺一般是在氢氟碳溶剂中使用氟气进行的。特别是公开了一种使双键氟化的连续工艺,该工艺包括形成一种反应流,该反应流由溶解在氢氟碳或氟碳溶剂中的式 1 或式 5 的化合物组成、
其中 R1 是羟基、烷氧基、氯或-OC(O)CH═CH2;反应流以约 0.2 毫升/分钟至约 2 毫升/分钟的流速流经连续氟化反应器,氟气以约 0.2 毫摩尔/分钟至约 2 毫摩尔/分钟的气体流速流经连续氟化反应器;式 1 或式 5 的化合物与氟气反应生成式 2 或式 6 的化合物
其中 R2 是羟基、烷氧基、氯或 -OC(O)CHFCH2F。