FIELD: organic chemistry, pharmacy.
SUBSTANCE: invention relates to new derivatives of dihydropyrimidine of the general formula (I):
or its isomeric form of the formula (Ia):
that can be used, for example, for treatment and prophylaxis of hepatitis B. In indicated formulas R1 means unsubstituted phenyl or phenyl substituted once or many times with similar or different substitutes taken among the group including halogen atom, trifluoromethyl group, nitro-, amino-group, hydroxyl and alkyl with 1-6 carbon atoms, or residues of formulas:
, 
or 
; R2 means residue of the formula -XR5 wherein X means a bond or oxygen atom; R5 means alkenyl with 2-4 carbon atoms or alkyl with 1-4 carbon atoms that can be unsubstituted or substituted with phenoxy-group; R3 means amino-group, alkyl with 1-4 carbon atoms or cyclopropyl; R4 means pyridyl that is substituted with up to three times with similar or different substitutes taken among the group including halogen atom, trifluoromethyl group, alkoxy-group with 1-6 carbon atoms and alkyl with 1-6 carbon atoms, and their salts. Also, invention relates to 3,5-difluoro-2-pyridincarboxyimidamide and 3,5-difluoro-2-pyridincarbonitrile that can be sued as intermediates products for preparing compounds of the formula (I) or (Ia) and to a medicinal gent.
EFFECT: improved preparing method, valuable medicinal properties of compounds.
10 cl, 2 sch, 4 tbl, 9 ex
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