Process for the preparation of 2,2-difluoroethylamine starting from a benzylamine compound
申请人:Lui Norbert
公开号:US08450528B2
公开(公告)日:2013-05-28
Process for the preparation of 2,2-difluoroethylamine of the formula (I)
CHF2CH2NH2 (I)
comprising the stages (i) and (ii):
stage (i): reaction of 2,2-difluoro-1-haloethane of the general formula (II)
CHF2—CH2Hal (II),
with a benzylamine compound of the formula (III)
in the presence of an acid scavenger,
in which, in formula (II),
Hal is chlorine, bromine or iodine,
and, in the formulae (III),
R1 is hydrogen or C1-C12-alkyl, and
R2 is hydrogen, halogen, C1-C12-alkyl or C1-C6-alkoxy;
stage (ii): catalytic hydrogenation of the N-benzyl-2,2-difluoroethanamine compound obtained in the stage (i) to give 2,2-difluoroethylamine of the formula (I) or a salt thereof.
制备2,2-二氟乙胺的过程(I)CHF2CH2NH2 (I)包括阶段(i)和(ii):阶段(i):在酸清除剂的存在下,将通式为(II)CHF2-CH2Hal (II)的2,2-二氟-1-卤代乙烷(其中,在式(II)中,Hal为氯、溴或碘),与通式为(III)苄基胺化合物反应(其中,在式(III)中,R1为氢或C1-C12烷基,R2为氢、卤素、C1-C12烷基或C1-C6烷氧基);阶段(ii):对在阶段(i)中获得的N-苄基-2,2-二氟乙胺化合物进行催化氢化,以得到式(I)的2,2-二氟乙胺或其盐。