US 4,055,644 A · Hydroxyalkyl substituted-4,5-dihydropyridazin(2H)-3-ones

Abstract

Hydroxyalkyl and aryl or heterocyclic substituted-4,5-dihydropyridazin(2H)-3-ones and diazobicyclo-ene-ones, e.g., 6-(p-chlorophenyl)-2-(2-hydroxybutyl)-4,5-dihydropyridazin(2H)-3-one are prepared by condensing 1-hydrazino-2-alkanols with aryl or heterocyclic-.gamma.-keto acids and are useful as central nervous system depressants.

Claims4

Dependent claims

A compound of the formula ##STR9## where R is lower alkyl having 1 or 4 carbon atoms,

R.sub.1, r.sub.2, r.sub.3 and R.sub.4 each independently represent hydrogen or lower alkyl having 1 to 4 carbon atoms, and represents ##STR10##

Dependencies are inferred from the claim text.

Facts

Application

05/614,539Filed 18 Sep 1975 · division

Priority

20 Nov 1970

Granted

25 Oct 1977

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

C07D 237/26
Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings: condensed with carbocyclic rings or ring systems
C07D 237/04
Not condensed with other rings: having less than three double bonds between ring members or between ring members and non-ring members
C07D 237/32
Phthalazines: with oxygen atoms directly attached to carbon atoms of the nitrogen-containing ring
C07D
Heterocyclic compounds

Family

Serial88,976Parent of this continuation-in-part · filed 20 Nov 1970

Serial166,565Parent of this continuation-in-part · filed 27 Jul 1971

Serial182,159Parent of this continuation-in-part · filed 20 Sep 1971

Serial366,670Parent of this continuation-in-part · filed 4 Jun 1973

Serial409,653Parent of this division · filed 25 Oct 1973

US 3,931,176 AParent of this division

US 4,055,644 AThis patent

From the US filing history. Foreign family members aren’t listed.

Abstract

Facts

Application

05/614,539Filed 18 Sep 1975 · division

Priority

20 Nov 1970

Granted

25 Oct 1977

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

C07D 237/26
Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings: condensed with carbocyclic rings or ring systems
C07D 237/04
Not condensed with other rings: having less than three double bonds between ring members or between ring members and non-ring members
C07D 237/32
Phthalazines: with oxygen atoms directly attached to carbon atoms of the nitrogen-containing ring
C07D
Heterocyclic compounds

Family

Serial88,976Parent of this continuation-in-part · filed 20 Nov 1970

Serial166,565Parent of this continuation-in-part · filed 27 Jul 1971

Serial182,159Parent of this continuation-in-part · filed 20 Sep 1971

Serial366,670Parent of this continuation-in-part · filed 4 Jun 1973

Serial409,653Parent of this division · filed 25 Oct 1973

US 3,931,176 AParent of this division

US 4,055,644 AThis patent

From the US filing history. Foreign family members aren’t listed.

Hydroxyalkyl substituted-4,5-dihydropyridazin(2H)-3-ones

Life of this patent

Abstract

Claims4

Hydroxyalkyl substituted-4,5-dihydropyridazin(2H)-3-ones

Life of this patent

Abstract

Claims4