Processes and intermediates for the preparation of soluble guanylate cyclase stimulators
The present disclosure relates to novel processes for the preparation of compounds of Formula I. Some of these compounds are useful as stimulators of soluble guanylate cyclase (sGC). Others are useful intermediates towards the preparation of said stimulators. These processes are amenable to large scale preparation and produce stable 3-(2-pyrimidinyl)pyrazoles of Formula I in high purity and yields. The present invention has the additional advantage of facile reaction conditions, amenable to scale up for large scale manufacturing. The disclosure also provides novel intermediates useful in the preparation of said compounds.
1. A process of preparing a compound of Formula IB:
comprising the step of:
i) coupling an amide for formula (1′):
with a pyrimidine compound of formula (2):
in an aprotic organic solvent in the presence of a base, to form, after quenching with acid, an intermediate of formula (3′):
ii) at a pH>5, optionally in the presence of added N,O-dimethylhydroxylamine or a salt thereof, allowing the mixture to react to form the compound of formula (4′):
iii) condensing the compound of formula (4′) with a hydrazine of formula
or a salt thereof, optionally in the presence of a base, to form a compound of Formula V:
iv) de-methylating the compound of Formula V to form an alcohol compound of formula (9′):
v) chlorinating the alcohol compound of formula (9′) with phosphoryl chloride to form a compound of Formula VI:
and
vi) reacting an amine of formula (13):
with the compound of Formula VI, optionally in the presence of a base, to yield the compound of Formula IB.
2. A process of preparing a compound of Formula IB:
comprising the step of:
i) coupling an amide of formula (1′):
with a pyrimidine compound of formula (2):
in an aprotic organic solvent in the presence of a base, to form, after quenching with an acid, an intermediate of formula (3′):
ii) at a pH>5, optionally in the presence of added N,O-dimethylhydroxylamine or a salt thereof, allowing the mixture to react to form the compound of formula (4′):
iiia) condensing the compound of formula (4′) with hydrazine to form the compound of formula (24′):
iiib) alkylating intermediate of formula (24′) with an alkylating agent of formula (23A) to provide the compound of Formula V:
iv) de-methylating the compound of Formula V to form an alcohol compound of formula (9′):
v) chlorinating the alcohol compound of formula (9′) with phosphoryl chloride to form a compound of Formula VI:
and
vi) reacting an amine of formula (13):
with the compound of Formula VI, optionally in the presence of a base, to yield the compound of Formula IB, wherein X is a leaving group selected from —Br, —I, —Cl, —F, and a sulfonate ester.
3. The process of claim 1 , wherein the compound of Formula IB is a compound of Formula IC:
wherein the amine of formula (13) is an amine of formula (19A) or its HCl salt of formula (19):
4. The process of claim 2 , wherein the compound of Formula IB is a compound of Formula IC:
wherein the amine of formula (13) is an amine of formula (19A) or its HCl salt of formula (19):
5. The process of claim 1 , wherein the compound of Formula IB is a compound of Formula ID:
wherein the amine of formula (13) is an amine of formula (15A) or its HCl salt of formula (15):
6. The process of claim 2 , wherein the compound of Formula IB is a compound of Formula ID:
wherein the amine of formula (13) is an amine of formula (15A) or its HCl salt of formula (15):
7. A process of preparing a compound of Formula IC:
comprises the steps of:
i) coupling an amide for formula (1′):
with a pyrimidine compound of formula (2):
in an aprotic organic solvent in the presence of a base, to form, after quenching with acid, an intermediate of formula (3′):
ii) at a pH>5, optionally in the presence of added N,O-dimethylhydroxylamine or a salt thereof, allowing the mixture to react to form the compound of formula (4′):
iii) condensing the compound of formula (4′) with a hydrazine of formula
or a salt thereof, optionally in the presence of a base, to form a compound of Formula V:
iv) de-methylating the compound of Formula V to form an alcohol compound of formula (9′):
v) chlorinating the alcohol compound of formula (9′) with phosphoryl chloride to form a compound of Formula VI:
and
vi) reacting an (L)-malic acid salt of an amine (21) represented by formula (18):
with the compound of Formula VI, optionally in the presence of a base, to yield the compound of Formula IC.
8. A process of preparing a compound of Formula IC:
comprising the steps of:
i) coupling an amide of formula (1′):
with a pyrimidine compound of formula (2):
in an aprotic organic solvent in the presence of a base, to form, after quenching with an acid, an intermediate of formula (3′):
ii) at a pH>5, optionally in the presence of added N,O-dimethylhydroxylamine or a salt thereof, allowing the mixture to react to form the compound of formula (4′):
iiia) condensing the compound of formula (4′) with a hydrazine to form a compound of formula (24′):
iiib) alkylating intermediate of formula (24′) with an alkylating agent of formula (23A) to provide the compound of Formula V:
iv) de-methylating the compound of Formula V to form an alcohol compound of formula (9′):
v) chlorinating the alcohol compound of formula (9′) with phosphoryl chloride to form a compound of Formula VI:
and
vi) reacting an (L)-malic acid salt of an amine (21) represented by formula (18):
with the compound of Formula VI, optionally in the presence of a base, to yield the compound of Formula IC, wherein X is a leaving group selected from —Br, —I, —Cl, —F, and a sulfonate ester.
9. A process of preparing a compound of Formula ID:
comprising the steps of:
i) coupling an amide of formula (1′):
with a pyrimidine compound of formula (2):
in an aprotic organic solvent in the presence of a base, to form, after quenching with an acid, an intermediate of formula (3′)
ii) at a pH>5, optionally in the presence of added N,O-dimethylhydroxylamine or a salt thereof, allowing the mixture to react to form the compound of formula (4′):
iii) condensing the compound of formula (4′) with a hydrazine of formula
or a salt thereof, optionally in the presence of a base, to form a compound of Formula V:
iv) de-methylating the compound of Formula V to form an alcohol compound of formula (9′):
v) chlorinating the alcohol compound of formula (9′) with phosphoryl chloride to form a compound of Formula VI:
and
vi) reacting a (D)-malic acid salt of an amine (20) represented by formula (14):
with the compound of Formula VI, optionally in the presence of a base, to yield the compound of Formula ID.
10. A process of preparing a compound of Formula ID:
comprising the steps of:
i) coupling an amide of formula (1′):
with a pyrimidine compound of formula (2):
in an aprotic organic solvent in the presence of a base, to form, after quenching with acid, an intermediate of formula (3′):
ii) at a pH>5, optionally in the presence of added N,O-dimethylhydroxylamine or a salt thereof, allowing the mixture to react to form the compound of formula (4′):
iiia) condensing the compound of formula (4′) with a hydrazine to form a compound of formula (24′):
iiib) alkylating intermediate of formula (24′) with an alkylating agent of formula (23A)
to provide the compound of Formula V:
iv) de-methylating the compound of Formula V to form an alcohol compound of formula (9′):
v) chlorinating the alcohol compound of formula (9′) with phosphoryl chloride to form a compound of Formula VI:
and
vi) reacting a (D)-malic acid salt of an amine (20) represented by formula (14):
with the compound of Formula VI, optionally in the presence of a base, to yield the compound of Formula ID, wherein X is a leaving group selected from —Br, —I, —Cl, —F, and a sulfonate ester.
11. The process of claim 9 , further comprising the step of crystallization of the compound of Formula ID to yield Form B of the compound.
12. The process of claim 11 wherein the crystallization comprises the steps of: A) dissolving the compound of Formula ID in acetonitrile and water at between a temperature between 40° C. and 80° C. to form a solution of the compound; B) filtering the solution of step A) to form a filtered solution of the compound; C) heating the filtered solution at a temperature between 40° C. and 80° C. and adding water to yield a slurry; D) cooling the slurry of step C) to yield crystalline Form B of the compound of Formula ID; and E) filtering and drying the crystalline Form B of the compound of Formula ID.
13. The process of claim 1 wherein the compound of formula (2) is prepared by a process comprising the steps of:
a) reacting dibromopyrimidine compound of formula (5):
with a base in methanol or a methoxide salt in an aprotic solvent to form a bromopyrimidine compound of formula (6):
b) coupling the bromopyrimidine compound of formula (6) with ethynyltrimethylsilane, in an aprotic organic solvent in the presence of a base and a Pd catalyst, optionally in the presence of a Cu(I) catalyst, to form a compound of formula (7):
and
c) de-silylating the compound of formula (7) to form the pyrimidine compound of (2).
14. The process of claim 1 wherein the compound of formula (1′) is prepared by reacting a carboxylic acid of formula (8′)
with oxalyl chloride or an equivalent amide coupling reagent, followed by N,O-dimethylhydroxylamine or a salt thereof, in the presence of a base to form the amide of formula (1′).
15. The process of claim 1 wherein the base in step i) is n-butyllithium.
16. The process of claim 1 wherein the process comprises contacting the reaction product of the reaction between the amide of formula (1′) and the pyrimidine compound of formula (2) with a solution comprising N,O-dimethylhydroxylamine or a salt thereof and an acid to form the compound of formula (4′).
17. The process of claim 16 , wherein the solution comprises N,O-dimethylhydroxylamine hydrochloride.
18. The process of claim 16 , wherein i) the acid is an aqueous acid, ii) the acid is hydrochloric acid; or iii) the acid is glacial acetic acid.
19. The process of claim 2 , wherein X is —Br.
20. The process of claim 10 , wherein said salt of N,O-dimethylhydroxylamine is HCl salt; said hydrazine is hydrazine hydrate; and said sulfonate ester is mesylate, tosylate or triflate.