METHOD OF 3-HALOGEN-4,5-DIHYDRO-1H PYRASOL PREPARATION Russian patent published in 2008 - IPC C07D401/04 C07D231/06 C07D231/14 

FIELD: chemistry.

SUBSTANCE: invention refers to the method of preparation of 3-halogen-4.5-dihydro-1H-pyrasol compound of the formula , it includes interreaction with HX¹of other 4.5-dihydro-1H-pyrasol compound of the formula , in which X¹ is halogen and R³, R⁴, Z, n and X² have values given in the description. The invention also describes preparation of the compounds of the formula , in which X¹, R³, R⁶, R⁷, R^8a, R^8b and n have values, which are indicated in the description, in terms of the formula (Ia) of the compound, prepared according to p.1 of the invention formula.

EFFECT: development of the alternative method of preparation of the compounds with using reagent of relatively low price.

9 cl, 1 tbl, 4 ex, 9 dwg