6-Keto prostaglandin derivatives

Abstract

Prostaglandin (PG.sub.1) derivatives having (1) a 6-keto feature, for example ##STR1## and amides thereof or (2) a 9-deoxy-6,9-epoxy feature together with a 5-halo or 6-hydroxy feature, for example ##STR2## said derivatives having pharmacological activity. Processes for preparing them and the appropriate intermediates are disclosed.

Description

BACKGROUND OF THE INVENTION

This invention relates to prostaglandin derivatives and to a process for preparing them.

The prostaglandins and analogs are well-known organic compounds derived from prostanoic acid which has the following structure and atom numbering: ##STR3##

As drawn hereinafter the formulas represent a particular optically active isomer having the same absolute configuration as PGE.sub.1 obtained from mammalian tissues.

In the formulas, broken line attachments to the cyclopentane ring or side chain indicate substituents in alpha configuration, i.e. below the plane of the ring or side chain. Heavy solid line attachments indicate substituents in beta configuration, i.e. above the plane.

For background, see for example Bergstrom et al., Pharmacol. Rev. 20, 1 (1968) and Pace-Asciak et al., Biochem. 10, 3657 (1971). Subsequent to this invention there appeared a publication on 6-keto-prostaglandin F.sub.1.alpha. by Pace-Asciak, J. Am. Chem. Soc. 98, 2348 (1976) and a publication on "PGX" (alternatively 6,9.alpha.-oxido-9.alpha.,15.alpha.-dihydroxyprosta-(Z)5, (E)13-dienoic acid) by E. J. Corey et al., J. Am. Chem. Soc. 99, 2006 (1977).

SUMMARY OF THE INVENTION

It is the purpose of this invention to provide novel products having pharmacological activity. It is a further purpose to provide a process for preparing these products and their intermediates.

Accordingly, there is provided a compound of the formula: ##STR4## or a mixture comprising that compound and the enantiomer thereof wherein R.sub.20 is ##STR5## wherein L is

(1) --(CH.sub.2).sub.d --C(R.sub.2).sub.2 -- (2) --CH.sub.2 --O--CH.sub.2 --Y-- or (3) --CH.sub.2 CH.dbd.CH-- wherein d is zero for 5, R.sub.2 is hydrogen, methyl, or fluoro, being the same or different with the proviso that one R.sub.2 is not methyl when the other is fluoro, and Y is a valence bond, --CH.sub.2 -- or --(CH.sub.2).sub.2 --, wherein Q is ##STR6## wherein R.sub.8 is hydrogen or alkyl of one to 4 carbon atoms, inclusive, wherein R.sub.1 is (1) --COOR.sub.3 (2) --CH.sub.2 OH (3) --CH.sub.2 N(R.sub.9)(R.sub.18) ##STR7## wherein R.sub.3 is (a) hydrogen, (b) alkyl of one to 12 carbon atoms, inclusive, (c) cycloalkyl of 3 to 10 carbon atoms, inclusive, (d) aralkyl of 7 to 12 carbon atoms, inclusive, (e) phenyl, (f) phenyl substituted with one, 2, or 3 chloro or alkyl of one to 4 carbon atoms, inclusive, ##STR8## wherein R.sub.10 is phenyl, p-bromophenyl, p-biphenylyl, p-nitrophenyl, p-benzamidophenyl, or 2-naphthyl, and wherein R.sub.11 is hydrogen or benzoyl, or (n) a pharmacologically acceptable cation, wherein R.sub.9 is hydrogen, methyl, or ethyl, and R.sub.18 is hydrogen, alkyl of one to 4 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, phenyl, or phenyl substituted with alkyl of one to 4 carbon atoms, inclusive; wherein R.sub.4 is ##STR9## wherein C.sub.g H.sub.2g is alkylene of one to 9 carbon atoms, inclusive, with one to 5 carbon atoms, inclusive, in the chain between --CR.sub.5 R.sub.6 -- and terminal methyl, wherein R.sub.5 and R.sub.6 are hydrogen, alkyl of one to 4 carbon atoms, inclusive, or fluoro, being the same or different, with the proviso that one of R.sub.5 and R.sub.6 is fluoro only when the other is hydrogen or fluoro and the further proviso that neither R.sub.5 nor R.sub.6 is fluoro when Z is oxa (--O--); wherein Z represents an oxa atom (--O--) or C.sub.j H.sub.2j wherein C.sub.j H.sub.2j is a valence bond or alkylene of one to 9 carbon atoms, inclusive, with one to 6 carbon atoms, inclusive between CR.sub.5 R.sub.6 -- and the phenyl ring; wherein T is alkyl of one to 4 carbon atoms, inclusive, fluoro, chloro, trifluoromethyl, or --OR.sub.7 -- wherein R.sub.7 is alkyl of one to 4 carbon atoms, inclusive, and s is zero, one, 2 or 3, with the proviso that not more than two T's are other than alkyl and when s is 2 or 3 the T's are either the same or different; and wherein X is (1) trans--CH.dbd.CH-- (2) cis--CH.dbd.CH-- (3) --C.tbd.C-- or (4) --CH.sub.2 CH.sub.2 --; including the lower alkanoates thereof.

In formula I as used herein, attachment to R.sub.20 and R.sub.21 corresponds to bonds to the cyclopentane ring at the C-8, C-9, and C-12 positions following prostaglandin nomenclature, thus: ##STR10##

Within the scope of the prostaglandin derivatives described herein there are represented

(a) PGF.sub..alpha. compounds when R.sub.20 is ##STR11##

(b) 11.beta.-PGF.sub..alpha. compounds when R.sub.20 is ##STR12##

(c) 11-Deoxy-11-keto-PGF.sub..alpha. compounds when R.sub.20 is ##STR13##

(d) 11-Deoxy-11-methylene-PGF.sub..alpha. compounds when R.sub.20 is ##STR14##

(e) 11-Deoxy-PGF.sub..alpha. compounds when R.sub.20 is ##STR15##

(f) 11-Deoxy-10,11-Didehydro-PGF.sub..alpha. compounds when R.sub.20 is ##STR16##

(g) 11-Deoxy-11-hydroxymethyl-PGF.sub..alpha. compounds when R.sub.20 is ##STR17##

Claims

1. A compound of the formula

or a mixture comprising that compound and the enantiomer thereof wherein R.sub.20 is ##STR18## wherein L is

(1) --(CH.sub.2).sub.d --C(R.sub.2).sub.2 --

(2) --CH.sub.2 --O--CH.sub.2 --Y-- or

(3) --CH.sub.2 CH.dbd.CH--

wherein d is zero to 5, R.sub.2 is hydrogen, methyl, or fluoro, being the same or different with the proviso that one R.sub.2 is not methyl when the other is fluoro, and Y is a valence bond, --CH.sub.2 -- or --(CH.sub.2).sub.2 --,

wherein

Q is ##STR19## wherein R.sub.8 is hydrogen or alkyl of one to 4 carbon atoms, inclusive,

wherein

R.sub.1 is ##STR20## wherein R.sub.9 is hydrogen, methyl, or ethyl, and R.sub.18 is hydrogen, alkyl of one to 4 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, phenyl, or phenyl substituted with alkyl of one to 4 carbon atoms, inclusive;

wherein

R.sub.4 is ##STR21## wherein C.sub.g H.sub.2g is alkylene of one to 9 carbon atoms, inclusive, with one to 5 carbon atoms, inclusive, in the chain between --CR.sub.5 R.sub.6 -- and terminal methyl, wherein R.sub.5 and R.sub.6 are hydrogen, alkyl of one to 4 carbon atoms, inclusive, or fluoro, being the same or different, with the proviso that one of R.sub.5 and R.sub.6 is fluoro only when the other is hydrogen or fluoro and the further proviso that neither R.sub.5 nor R.sub.6 is fluoro when Z is oxa (--O--); wherein Z represents an oxa atom (--O--) or C.sub.j H.sub.2j wherein C.sub.j H.sub.2j is a valence bond or alkylene of one to 9 carbon atoms, inclusive, with one to 6 carbon atoms, inclusive between CR.sub.5 R.sub.6 -- and the phenyl ring; wherein T is alkyl of one to 4 carbon atoms, inclusive, fluoro, chloro, trifluoromethyl, or --OR.sub.7 -- wherein R.sub.7 is alkyl of one to 4 carbon atoms, inclusive, and s is zero, one, 2 or 3, with the proviso that not more than two T's are other than alkyl and when s is 2 or 3 the T's are either the same or different; and

wherein

X is

(1) trans--CH.dbd.CH--

(2) cis--CH.dbd.CH--

(3) --C.tbd.C-- or

(4) --CH.sub.2 CH.sub.2 --.

2. A compound according to claim 1 wherein R.sub.20 is ##STR22##

3. A compound according to claim 1 wherein R.sub.20 is ##STR23##

4. A compound according to claim 1 wherein R.sub.20 is ##STR24##

5. A compound according to claim 1 wherein R.sub.20 is ##STR25##

6. A compound according to claim 1 wherein R.sub.20 is ##STR26##

7. A compound according to claim 1 wherein R.sub.20 is ##STR27##

8. A compound according to claim 1 wherein R.sub.20 is ##STR28## wherein L is --(CH.sub.2).sub.n, n being 3, 4, or 5, wherein Q is ##STR29## wherein R.sub.8 is limited to hydrogen, methyl, or ethyl, and

wherein

R.sub.4 is n-pentyl, 1,1-dimethylpentyl, 1,1-difluoropentyl, ##STR30##

9. A compound according to claim 8 wherein R.sub.1 is ##STR31## wherein R.sub.9 and R.sub.18 are as defined in claim 1.

10. 6-Keto-PGF.sub.1.alpha., amide, a compound according to claim 9.

11. 6-Keto-PGF.sub.1.alpha., methylamide, a compound according to claim 9.

12. 6-Keto-PGF.sub.1.alpha., benzylamide, a compound according to claim 9.

13. 6-Keto-PGF.sub.1.alpha., anilide, a compound according to claim 9.

14. A compound according to claim 11 wherein X is --C.tbd.C--.

15. A compound according to claim 8 wherein X is --CH.sub.2 CH.sub.2 --.

16. A compound according to claim 8 wherein X is trans--CH.dbd.CH--.

17. 6-Keto-PGF.sub.1.alpha., n-butylamide, a compound according to claim 16.