A process for the preparation of aminoalkyl phenyl carbamate compounds of Formula I, wherein R1 and R2 independently are hydrogen or a C1-6 alkyl; R3 and R4 are the same or different and each is a C1-6 alkyl; or R3 and R4 together with the nitrogen to which they are attached form a cyclic three to eight membered ring, with or without a heteroatom like nitrogen or oxygen; R5 and R6 independently are hydrogen, linear, branched or cyclic C1-6 alkyl; or R5 and R6 together with the nitrogen to which they are attached form a cyclic three to eight membered ring, with or without a heteroatom like nitrogen or oxygen; the carbon centre designated “*” can be racemic or enantiomerically enriched in the (R)- or (S)- configuration; and pharmaceutically acceptable acid addition salts thereof.