PROCESS FOR THE PREPARATION OF 2,2-DIFLUOROETHYLAMINE STARTING FROM PROP-2-EN-1-AMINE
申请人:LUI Norbert
公开号:US20120142971A1
公开(公告)日:2012-06-07
A 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 formula (II)
CHF
2
—CH
2
Hal (II)
in which Hal is chlorine, bromine or iodine,
with prop-2-en-1-amine of the formula (III)
to give N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV)
preferably in the presence of an acid scavenger,
and
stage (ii): removal of the allyl group from the N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV) obtained in stage (i) to give 2,2-difluoroethylamine of the formula (I) or a salt thereof.
一种制备2,2-二氟乙基胺的方法,其化学式为(I)CHF2CH2NH2,包括步骤(i)和步骤(ii):步骤(i):将化学式为(II)CHF2-CH2Hal的2,2-二氟-1-卤代乙烷(其中Hal为氯、溴或碘)与化学式为(III)的丙烯酰胺反应,得到化学式为(IV)的N-(2,2-二氟乙基)丙烯酰胺,最好在酸清除剂的存在下进行;步骤(ii):从步骤(i)中得到的化学式为(IV)的N-(2,2-二氟乙基)丙烯酰胺中去除丙烯基,得到化学式为(I)的2,2-二氟乙基胺或其盐。