Chemistry is traditionally divided into organic and inorganic chemistry. Application In Synthesis of 3,5-Dichloropyridazine, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 1837-55-4
FUSED PYRIMIDINE DERIVATIVES
The present invention relates to a compound of formula (I) wherein R1 is phenyl, lower alkyl, C3-6-cycloalkyl, -CH2-C3-6-cycloalkyl or bridged C4-6-cycloalkyl, substituted by one, two or three halogen atoms, or by lower alkyl or lower alkyl substituted by halogen;R2 is a five or six membered heteroaryl group, selected from or wherein R6 is hydrogen, lower alkyl, halogen or lower alkoxy; and R7 is hydrogen, lower alkoxy or halogen; R3 is lower alkyl or lower alkyl substituted by hydroxy: R4 is hydrogen or lower alkyl; R5 is hydrogen or lower alkyl; n is 1 or 2; -( )n- is -CH2- or -CH2CH2- for n being 1 or 2; or to a pharmaceutically active acid addition salt thereof, to a racemic mixture or to its corresponding enantiomer and/or optical isomer and/or stereoisomer thereof. The compounds may be used for the treatment of Alzheimer’s disease, cerebral amyloid angiopathy, hereditary cerebral hemorrhage with amyloidosis, Dutch-type (HCHWA-D), multi-infarct dementia, dementia pugilistica or Down syndrome.
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Reference£º
Pyridazine – Wikipedia,
Pyridazine | C4H4N1142 – PubChem