NOVELTY - Preparing cinacalcet (I) or its salt comprises: (a) reacting racemic 1-(1-naphthyl)ethylamine with D-(-)-tartaric acid in an organic solvent to obtain (R)-(+)-1-(1-naphthyl) ethylamine tartrate (II); (b) converting (II) into (R)-(+)-1-(1-naphthyl)ethyl amine (A) in the presence of a base in an organic solvent; (c) reacting (A) with 3-(3-(trifluoro-methyl)phenyl)propanal (B) in a solvent and a reducing agent under hydrogen pressure to obtain (I); and (d) optionally, converting (I) into its salt.    USE - The process is useful for preparing cinacalcet. The solid state form of (II) is useful for the preparation of cinacalcet hydrochloride (all claimed), which is useful for the treatment of hyperparathyroidism and the preservation of bone density in patients with kidney failure or hypercalcemia due to cancer. No biological data given.    ADVANTAGE - The eco-friendly process allows simple preparation of the cinacalcet with high purity and less reaction steps and without using hazardous and toxic reagents in an industrial manner.    DETAILED DESCRIPTION - Preparing cinacalcet of formula (I) or its salt comprises: (a) reacting racemic 1-(1-naphthyl)ethylamine with D-(-)-tartaric acid in an organic solvent to obtain (R)-(+)-1-(1-naphthyl) ethylamine tartrate (II); (b) converting (II) into (R)-(+)-1-(1-naphthyl)ethyl amine (A) in the presence of a base in an organic solvent; (c) reacting (A) with 3-(3-(trifluoro-methyl)phenyl)propanal (B) in a solvent and a reducing agent under hydrogen pressure to obtain (I); and (d) optionally, converting (I) into its salt. INDEPENDENT CLAIMS are included for:    (1) (R)-(+)-1-(1-naphthyl) ethylamine tartrate (II) in solid form having a X-Ray diffraction pattern having peak values as given in figure 2 of the specification, additional peaks, an infrared spectrum as given in figure 3 of the specification, or an infrared spectrum having absorption bands as given in the specification;    (2) one pot process for preparing (I) comprising reacting (A) with (B) in a solvent and Raney-nickel as a reducing agent under hydrogen pressure to obtain (I);    (3) preparing (II) in the solid state form comprising reacting racemic 1-(1-naphthyl)ethylamine with D-(-)-tartaric acid in the organic solvent at 55-65 degrees C and isolating (II) in the solid state form; and    (4) cinacalcet hydrochloride having purity of greater than 99%, preferably greater than 99.98% and all other impurities of less than 0.1% as measured by HPLC.