Process for preparing 4-amino-pyridazines

Patent metadata

Field	Value
Publication number	US-12162841-B2
Application number	US-202117323337-A
Country	US
Kind code	B2
Filing date	May 18, 2021
Priority date	May 11, 2015
Publication date	Dec 10, 2024
Grant date	Dec 10, 2024

Abstract

Provided herein is a process for preparing a pyridazine amine compound of formula V, and a process for preparing dichloropyridazine amine compounds of formula IVa, IVb, and mixtures thereof. Further, provided herein are dichloropyridazine amine compounds of formula IVa, IVb, and mixtures thereof, wherein the amino group is an ethylamino group.

First claim

The invention claimed is:

1. A process for preparing (a) a dichloropyridazine amine compound of formula IVa or a salt, tautomer, or N-oxide thereof, or (b) a dichloropyridazine amine compound of formula IVb or a salt, tautomer, or N-oxide thereof, or (c) a mixture of (a) and (b)

in a one-pot reaction comprising steps of
reacting a compound of formula II

with POCl 3 , and
reacting the resulting crude reaction product with an amine compound R 1 —NH 2 or a salt thereof, wherein R 1 is CH 2 CH 3 .

2. The process according to claim 1 , wherein the process further comprises the step of preparing a compound of formula II

by reacting mucochloric acid (I)

with hydrazine and a salt thereof.

3. A process for preparing at least one of (i) a pyridazine amine compound of formula V or a salt, tautomer, or N-oxide thereof, and (ii) a compound of formula VII or a stereoisomer, salt, tautomer, or N-oxide thereof, the process comprising:
performing the process according to claim 1 to form (a) the dichloropyridazine amine compound of formula IVa or a salt, tautomer, or N-oxide thereof, or (b) the dichloropyridazine amine compound of formula IVb or a salt, tautomer, or N-oxide thereof, or (c) the mixture of (a) and (b);
converting (a) the dichloropyridazine amine compound of formula IVa or a salt, tautomer, or N-oxide thereof, or (b) the dichloropyridazine amine compound of formula IVb or a salt, tautomer, or N-oxide thereof, or (c) the mixture of (a) and (b) into a pyridazine amine compound of formula V or a salt, tautomer, or N-oxide thereof

by reacting (a) the dichloropyridazine amine compound of formula IVa or a salt, tautomer, or N-oxide thereof, or (b) the dichloropyridazine amine compound of formula IVb or a salt, tautomer, or N-oxide thereof, or (c) the mixture of (a) and (b)

with hydrogen in the presence of a hydrogenation catalyst, wherein R 1 is CH 2 CH 3 ; and
optionally converting the pyridazine amine compound of formula V or a salt, tautomer, or N-oxide thereof into a compound of formula VII or a stereoisomer, salt, tautomer, or N-oxide thereof

by reacting the pyridazine amine compound of formula V or a salt, tautomer, or N-oxide thereof

with a compound of formula VI or a stereoisomer, salt, tautomer, or N-oxide thereof

wherein R 1 is CH 2 CH 3 ;
wherein
R 2 is H, halogen, CN, NO 2 , C 1 -C 10 -alkyl, C 2 -C 10 -alkenyl, or C 2 -C 10 -alkynyl, wherein the 3 last mentioned radicals may be unsubstituted, may be partially or fully halogenated or may carry 1, 2 or 3 identical or different substituents R x , or OR a , SR a , C(Y)R b , C(Y)OR c , S(O)R d , S(O) 2 R d , NR e R f , C(Y)NR g R h , heterocyclyl, hetaryl, C 3 -C 10 -cycloalkyl, C 3 -C 10 -cycloalkenyl or phenyl, wherein the five last mentioned radicals may be unsubstituted or may carry 1, 2, 3, 4 or 5 identical or different substituents selected from the radicals R y and R x ;
R 3 is H, halogen, CN, NO 2 , C 1 -C 10 -alkyl, C 2 -C 10 -alkenyl, or C 2 -C 10 -alkynyl, wherein the 3 last mentioned radicals may be unsubstituted, may be partially or fully halogenated or may carry 1, 2 or 3 identical or different substituents R x , or OR a , SR a , C(Y)R b , C(Y)OR c , S(O)R d , S(O) 2 R d , NR e R f , C(Y)NR g R h , heterocyclyl, hetaryl, C 3 -C 10 -cycloalkyl, C 3 -C 10 -cycloalkenyl or phenyl, wherein the five last mentioned radicals may be unsubstituted or may carry 1, 2, 3, 4 or 5 identical or different substituents selected from the radicals R y and R x ;
R N is H, CN, NO 2 , C 1 -C 10 -alkyl, C 2 -C 10 -alkenyl, or C 2 -C 10 -alkynyl, wherein the three last mentioned radicals may be unsubstituted, may be partially or fully halogenated or may carry 1, 2 or 3 identical or different substituents R x , or OR a , SR a , C(Y)R b , C(Y)OR c , S(O)R d , S(O) 2 R d , NR e R f , C(Y)NR g R h , S(O) m NR e R f , C(Y)NR i NR e R f , C 1 -C 5 -alkylen-OR a , C 1 -C 5 -alkylen-CN, C 1 -C 5 -alkylen-C(Y)R b , C 1 -C 5 -alkylen-C(Y)OR c , C 1 -C 5 -alkylen-NR e R f , C 1 -C 5 -alkylen-C(Y)NR g R h , C 1 -C 5 -alkylen-S(O) m R d , C 1 -C 5 -alkylen-S(O) m NR e R f , C 1 -C 5 -alkylen-NR i NR e R f , heterocyclyl, hetaryl, C 3 -C 10 -cycloalkyl, C 3 -C 10 -cycloalkenyl, heterocyclyl-C 1 -C 5 -alkyl, hetaryl-C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkyl-C 1 -C 5 -alkyl, C 3 -C 10 -cycloalkenyl-C 1 -C 5 -alkyl, phenyl-C 1 -C 5 -alkyl, or phenyl, wherein the rings of the ten last mentioned radicals may be unsubstituted or may carry 1, 2, 3, 4 or 5 identical or different substituents R y ;
and wherein
R a , R b , R c are independently of each other selected from H, C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -cycloalkylmethyl, C 3 -C 6 -halocycloalkyl, C 2 -C 4 -alkenyl, C 2 -C 4 -haloalkenyl, C 2 -C 4 -alkynyl, C 1 -C 4 -alkoxy-C 1 -C 4 -alkyl, heterocyclyl, heterocyclyl-C 1 -C 4 -alkyl, phenyl, hetaryl, phenyl-C 1 -C 4 -alkyl, and hetaryl-C 1 -C 4 -alkyl, wherein the ring in the six last mentioned radicals may be unsubstituted or may carry 1, 2, 3, 4, or 5 substituents which, independently of each other, are selected from halogen, CN, NO 2 , C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 1 -C 4 -alkoxy, and C 1 -C 4 -haloalkoxy;
R d is selected from C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -cycloalkylmethyl, C 3 -C 6 -halocycloalkyl, C 2 -C 4 -alkenyl, C 2 -C 4 -haloalkenyl, C 2 -C 4 -alkynyl, C 1 -C 4 -alkoxy-C 1 -C 4 -alkyl, heterocyclyl, heterocyclyl-C 1 -C 4 -alkyl, phenyl, hetaryl, phenyl-C 1 -C 4 -alkyl, and hetaryl-C 1 -C 4 -alkyl, wherein the ring in the six last mentioned radicals may be unsubstituted or may carry 1, 2, 3, 4, or 5 substituents which are independently of each other selected from halogen, CN, NO 2 , C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 1 -C 4 -alkoxy, and C 1 -C 4 -haloalkoxy;
R e , R f are independently of each other selected from H, C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -cycloalkylmethyl, C 3 -C 6 -halocycloalkyl, C 2 -C 4 -alkenyl, C 2 -C 4 -haloalkenyl, C 2 -C 4 -alkynyl, C 1 -C 4 -alkoxy-C 1 -C 4 -alkyl, C 1 -C 4 -alkylcarbonyl, C 1 -C 4 -haloalkylcarbonyl, C 1 -C 4 -alkylsulfonyl, C 1 -C 4 -haloalkylsulfonyl, heterocyclyl, heterocyclyl-C 1 -C 4 -alkyl, heterocyclylcarbonyl, heterocyclylsulfonyl, phenyl, phenylcarbonyl, phenylsulfonyl, hetaryl, hetarylcarbonyl, hetarylsulfonyl, phenyl-C 1 -C 4 -alkyl, and hetaryl-C 1 -C 4 -alkyl, wherein the ring in the twelve last mentioned radicals may be unsubstituted or may carry 1, 2, 3, 4, or 5 substituents which, independently of each other, are selected from halogen, CN, NO 2 , C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 1 -C 4 -alkoxy, and C 1 -C 4 -haloalkoxy; or
R e and R f together with the nitrogen atom to which they are bound form a 5- or 6-membered, saturated or unsaturated heterocyc

Assignees

• Basf Se

Inventors

• Klauber Eric George
• Rack Michael
• Goetz Roland
• Soergel Sebastian

Classifications

• C07D403/12

  linked by a chain containing hetero atoms as chain links · CPC title

• C07D237/12

  Halogen atoms or nitro radicals · CPC title

• C07B43/04

  of amino groups · CPC title

• C07B39/00

  Halogenation · CPC title

• C07B31/00

  Reduction in general · CPC title