PROCESS FOR THE PREPARATION OF 2,2-DIFLUOROETHYLAMINE STARTING FROM A BENZYLAMINE COMPOUND
申请人:LUI Norbert
公开号:US20120123163A1
公开(公告)日:2012-05-17
Process for the preparation of 2,2-difluoroethylamine of the formula (I)
CHF
2
CH
2
NH
2
(I)
comprising the stages (i) and (ii):
stage (i): reaction of 2,2-difluoro-1-haloethane of the general formula (II)
CHF
2
—CH
2
Hal (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),
R
1
is hydrogen or C
1
-C
12
-alkyl, and
R
2
is hydrogen, halogen, C
1
-C
12
-alkyl or C
1
-C
6
-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2,2-二氟乙基胺(I)CHF2CH2NH2(I)的过程包括以下两个步骤(i)和(ii):步骤(i):在酸清除剂的存在下,将通式(II)CHF2-CH2Hal(II)的2,2-二氟-1-卤代乙烷与通式(III)中的苄基胺化合物反应,其中,在式(II)中,Hal是氯、溴或碘,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;步骤(ii):将在步骤(i)中得到的N-苄基-2,2-二氟乙胺化合物催化氢化,得到式(I)的2,2-二氟乙基胺或其盐。