1. A process for preparing a compound of formula (1): or a salt thereof, comprising: reacting a compound of formula (5) or a salt thereof, with hydrazine monohydrate, where R is a C-Calkil.2. A method according to claim 1, wherein the compound of formula (5) or its salt is prepared by reacting a compound of formula (4): or its salt with 4-fluorobenzaldehyde in the presence of a reducing agent and an acid or Lewis acid, wherein R is a C-Calkil.3. A method according to claim 2, wherein the reducing reagent is a halide metalla.4. A method according to claim 3, wherein the metal halide is TiClili SnCl.5. A method according to claim 2, wherein the reducing agent is a powder Fe.6. A method according to claim 2, wherein the reducing agent is hydrogen in the presence of a metal katalizatora.7. A method according to claim 6, wherein the metal catalyst is selected from the group consisting of palladium, nickel and platiny.8. A method according to claim 2, wherein the reducing agent is MCNBH, wherein M is selected from the group consisting of Li, Na, K, and BuN.9. A method according to claim 2, wherein the acid is an inorganic acid selected from the group consisting of HCl, HBr, HI, HSOi HPO.10. A method according to claim 2, wherein the acid is an organic acid selected from the group consisting of formic acid, acetic acid, propionic acid, butyric acid, trifluoroacetic acid, p-toluenesulfonic acid, and methylsulfonic kisloty.11. A method according to claim 2, wherein the Lewis acid is selected from the group consisting of AlCl, TiCl, SnCli ZnCl.12. A method according to claim 2, wherein the compound of formula (4) or its salt is prepared by treating a compound of formula (3): or a salt thereof Preece compound R-OH1. Способ получения соединения формулы (1):или его соли, включающий:взаимодействие соединения формулы (5),или его соли, с моногидратом гидразина, где R представляет собой C1-C 6 алкил.2. Способ по п.1, где соединение формулы (5) или его соль получают взаимодействием с
