Patent ID: 8039672

Claim:
A method of obtaining a 3,3-diphenylpropylamine of formula (I): wherein R 1 is hydrogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl or alkoxyalkyl of formula —(CH 2 ) n —O—R 5 , wherein n is an integer of 1 to 3 and R 5 is C 1 -C 6 alkyl; R 2 is C 1 -C 6 alkyl, C 1 -C 6 alkoxy, halogen, NO 2 , CN, CHO which may be free or protected, CH 2 OH or COOR 6 , wherein R 6 is H or a C 1 -C 6 alkyl group; R 3 and R 4 are selected independently from H and C 1 -C 8 alkyl or together with the nitrogen to which they are bound form a ring having 3 to 7 members; its enantiomers or mixtures thereof, or its salts, which comprises: a) reacting a compound of formula (II) wherein R 3 and R 4 have the previously indicated meaning, with a compound of formula (III) wherein R 1 and R 2 have the previously indicated meaning; and b) optionally, separating the desired (R) or (S) enantiomer, or the mixture of enantiomers, and/or converting the compound of formula (I) into a salt thereof.