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US 6,255,528 B1Granted
Process for preparing phenethylamines and novel chemical compounds
OwnerPeter Müller, Albrecht Marholdinventors
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Abstract
Fluorine-containing phenethylamines are obtained in an advantageous manner by reacting fluorine-containing bromobenzenes with acrylamide in the presence of a palladium catalyst, hydrogenating the resulting arylacrylamides catalytically and then rearranging the arylamides obtained. The invention also embraces novel arylacrylamides and novel arylamides.
Claims10
A process for preparing fluorine-containing phenethylamines of the Formula
- in which
- one of the radicals R1 and R2 represents fluorine, trifluoromethyl, trifluoromethoxy, tetrafluoroethoxy or pentafluoroethoxy and the other represents hydrogen, C1-C6-alkyl, C1-C6-alkoxy, fluorine, trifluoromethyl, trifluoromethoxy, tetrafluoroethoxy or pcntafluoroethoxy or
- R1 and R2 together represent —O—CF2—O—, —O—CF2—CF2— or —O—CF2—CF2—O— and
- R3 represents hydrogen, chlorine, C1-C6-alkyl or C1-C6-alkoxy,
- which comprises in a first step reacting a substituted bromobenzene of the Formula
- in which
- R1, R2 and R3 are as defined under Formula (I)
- with acrylamide in the presence of a palladium catalyst,
- in a second step hydrogenating catalytically the resulting arylacrylamide of the Formula
- in which
- the radicals R1, R2 and R3 are as defined under Formula (I) and
- in a third step rearranging the arylamide obtained in step two of the Formula
- in which
- R1, R2 and R3 are as defined under Formula (I).
11 more elements
Dependencies are inferred from the claim text.