申请人:Basilea Pharmaceutica AG
公开号:US07816537B2
公开(公告)日:2010-10-19
Disclosed is a process for the manufacture of a compound of formula (I)
wherein
Hal represents fluoro or chloro, and R1 and R2 represent, independently from one another, hydrogen or Hal; in which process a compound of formula (II)
is converted to a corresponding alkyl, fluoroalkyl or aryl sulfonic acid ester, which is then reacted with an alkali metal nitrite in the presence of a suitable crown ether in a polar non-nucleophilic solvent at a temperature of −10 to 50° C. to give the compound of formula (I).
本发明公开了一种制备式(I)化合物的方法,其中Hal代表氟或氯,R1和R2分别独立地代表氢或Hal; 在该方法中,化合物式(II)转化为相应的烷基,氟烷基或芳基磺酸酯,然后在极性非亲核溶剂中,在适当的冠醚存在下,与碱金属亚硝酸盐在−10至50℃的温度下反应,以给出式(I)化合物。