Pyrimidinone derivatives, preparation thereof and pharmaceutical use thereof

1. A compound of formula (Ia):

wherein:

R1a represents a linear or branched alkyl, alkenyl or alkynyl radical, a cycloalkyl radical or a heterocycloalkyl radical, containing from 1 to 7 carbon atoms, all these radicals being optionally substituted with one or several radicals, either identical or different, selected from halogen atoms and the radicals R7a, —S(O)xa-R7a with xa representing the integer 0, 1 or 2, —SO 2 NR5aR7a, —CN, —OR5a, —NR5aR6a, —NR5a-COR7a, —NR5a-CO 2 —R7a, —NR5a-SO 2 —R7a, —NHCONR5aR6a, —COR7a, —CO 2 R5a and —CONR5aR6a;

R2a represents a hydrogen atom, an alkyl radical or a cycloalkyl;

R3a represents an alkyl radical, a cycloalkyl or phenyl radical optionally substituted with one or several radicals either identical or different selected from halogen atoms and radicals —OR5a and —NR5aR6a;

R2a and R3a may optionally form with the carbon atom to which they are bound a cyclic radical containing 3 to 10 members and optionally one or several other heteroatoms selected from O, S and —NR5a, this cyclic radical being optionally substituted with one or several radicals either identical or different, selected from halogen atoms, oxo, R5a, —OR5a and —NR5aR6a radicals;

R4a represents a hydrogen atom, an alkyl radical, a halogen atom or a —CN radical;

with R5a and R6a either identical or different representing a hydrogen atom or an alkyl, cycloalkyl or heterocycloalkyl radical

and R7a, either identical or different from R5a and R6a, represents an alkyl, cycloalkyl or heterocycloalkyl radical,

the alkyl, cycloalkyl, heterocycloalkyl radicals above, which R5a, R6a and R7a may represent, being themselves optionally substituted with one or several radicals, either identical or different, selected from halogen atoms, —OR8a and —NR8aR9a with R8a and R9a either identical or different representing a hydrogen atom or an alkyl, cycloalkyl or heterocycloalkyl radical;

said products of formula (Ia) being in all the racemic, enantiomeric and diastereoisomeric possible isomeric forms, as well as addition salts with inorganic and organic acids or with inorganic and organic bases of said products of formula (Ia).

2. The compound of claim 1 , having the following formulae:

(2S)-1-(2-Ethylbutyl)-2-methyl-7-(morpholin-4-yl)-2-(trifluoromethyl)-2,3-dihydroimidazo[1,2-a]pyrimidin-5 (1H)-one

(2S)-1-Cyclopropyl-2-methyl-7-(morpholin-4-yl)-2-(trifluoromethyl)-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one

(2S)-1-Cyclopentyl-2-methyl-7-(morpholin-4-yl)-2-(trifluoromethyl)-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one

(S)-1-(2-Isopropoxy-ethyl)-2-methyl-7-(morpholin-4-yl)-2-(trifluoromethyl)-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one

(S)-1-(2-Hydroxy-2-methyl-propyl)-2-methyl-7-(morpholin-4-yl)-2-(trifluoromethyl)-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one

(S)-1-(2-Methoxy-2-methyl-propyl)-2-methyl-7-(morpholin-4-yl)-2-(trifluoromethyl)-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one

1-(2-Isopropoxyethyl)-2,2-dimethyl-7-(morpholin-4-yl)-2,3-dihydroimidazo[1,2-a]pyrimidin-5(1H)-one

1′-(2-Methoxyethyl)-7′-morpholin-4-ylspiro[cyclopentane-1,2′-imidazo[1,2-a]pyrimidin]-5′-one

1′-(2-Isopropoxyethyl)-7′-morpholin-4-ylspiro[cyclopentane-1,2′-imidazo[1,2-a]pyrimidin]-5′-one

as well as addition salts with inorganic and organic acids or with inorganic and organic bases of said compound.

3. The compound of formula (Ib):

wherein:

p=0 or 1 and q=1 or 2 such that:

if p=0 then q=2;

if p=1 then q=1

R1b represents a linear or branched alkyl, alkenyl, or alkynyl radical, a cycloalkyl radical or a heterocycloalkyl radical, containing from 1 to 7 carbon atoms, all these radicals being optionally substituted with one or several radicals, either identical or different, selected from halogen atoms and the radicals R7b, —S(O)xb-R7b with xb representing the integer 0, 1 or 2, —SO 2 NR5bR7b, —CN, —OR5b, —NR5bR6b, —NR5b-COR7b, —NR5b-CO 2 —R7b, —NR5b-SO 2 —R7b, —NHCONR5bR6b, —COR7b, —CO 2 R5b and —CONR5bR6b;

R2b represents a hydrogen atom, an alkyl radical or a cycloalkyl radical;

R3b represents an alkyl radical, a cycloalkyl or phenyl radical optionally substituted with one or several radicals, either identical or different, selected from halogen atoms and from —OR5b and —NR5bR6b radicals;

R2b and R3b may optionally form with the carbon atom to which they are bound, a cyclic radical containing from 3 to 10 members and optionally one or several other heteroatoms selected from O, S and —NR5b, this cyclic radical being optionally substituted with one or several radicals, either identical or different, selected from halogen atoms, oxo, R5b, —OR5b and —NR5bR6b radicals;

R4b represents a hydrogen atom, an alkyl radical, a halogen atom or a —CN radical;

with R5b and R6b either identical or different, representing a hydrogen atom or an alkyl, cycloalkyl or heterocycloalkyl radical

and R7b, either identical or different from R5b and R6b, representing an alkyl, cycloalkyl or heterocycloalkyl radical,

the above alkyl, cycloalkyl, heterocycloalkyl radicals which are R5b and R6b and R7b may represent, being themselves optionally substituted with one or several radicals, either identical or different, selected from halogen atoms, —OR8b et —NR8bR9b with R8b and R9b either identical or different, representing a hydrogen atom or an alkyl, cycloalkyl, or heterocycloalkyl radical;

said compound of formula (Ib) being in all the racemic, enantiomeric and diastereoisomeric possible isomeric forms, as well as addition salts with inorganic and organic acids or with inorganic and organic bases of said compound of formula (Ib).

4. The compound of claim 3 , having the following formulae:

(8S)-9-(2-Ethylbutyl)-2-(morpholin-4-yl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(8S)-9-(Cyclopropylmethyl)-2-(morpholin-4-yl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(8S)-9-Cyclopentyl-2-(morpholin-4-yl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(8S)-9-(2-Hydroxyethyl)-2-(morpholin-4-yl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(S)-9-(2-Isopropoxy-ethyl)-2-(morpholin-4-yl)-8-trifluoromethyl-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(S)-2-(Morpholin-4-yl)-9-[2-(2,2,2-trifluoro-ethoxy)-ethyl]-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(8S)-3-Fluoro-9-(2-isopropoxy-ethyl)-2-(morpholin-4-yl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(8S)-9-(2-Hydroxy-2-methylpropyl)-2-(morpholin-4-yl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(S)-9-(2-Hydroxy-2-methyl-propyl)-3-methyl-2-(morpholin-4-yl)-8-trifluoromethyl-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(S)-9-(2-Methoxy-2-methyl-propyl)-2-(morpholin-4-yl)-8-trifluoromethyl-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(8S)-8-Methyl-2-(morpholin-4-yl)-9-(2-(propan-2-yloxy)ethyl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

(8R)-8-Methyl-2-(morpholin-4-yl)-9-(2-(propan-2-yloxy)ethyl)-8-(trifluoromethyl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

9-(2-Methoxyethyl)-8,8-dimethyl-2-(morpholin-4-yl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

9-(2-Isopropoxyethyl)-8,8-dimethyl-2-(morpholin-4-yl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

9-(2-Methoxyethyl)-7,7-dimethyl-2-(morpholin-4-yl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

9-(2-Isopropoxyethyl)-7,7-dimethyl-2-(morpholin-4-yl)-6,7,8,9-tetrahydro-4H-pyrimido[1,2-a]pyrimidin-4-one

1′-(2-Isopropoxyethyl)-8′-(morpholin-4-yl)-1′,2′-dihydro-spiro[cyclopropane-1,3′-pyrimido[1,2-a]pyrimidin]-6′-one

(8S)-9-(2-Methanesulfonyl-ethyl)-2-morpholin-4-yl-8-trifluoromethyl-6,7,8,9-tetrahydro-pyrimido[1,2-a]pyrimidin-4-one

as well as the addition salts with the inorganic and organic acid or with the inorganic and organic bases of said compound of formula (Ib).

5. A method for preparing the compound of claim 1 according to the scheme 1a as defined hereafter:

wherein the substituents R1a, R2a, R3a, R4a, R5a and R6a have the meanings indicated in claim 1 ; Ra represents an alkyl radical; Xa represents Cl, Br, I, OMs, OTs or OTf; and Ya and Za represent independently a hydrogen or a linear alkyl radical.

6. A method for preparing the compound of claim 3 , according to scheme 1b as defined hereafter:

wherein the substituents p, q, R1b, R2b, R3b and R4b have the meanings indicated in claim 5 ; Rb represents an alkyl radical; Xb represents Cl, Br, I, OMs, OTs or OTf; and Yb and Zb represent independently a hydrogen or a linear alkyl radical.

7. A pharmaceutical composition comprising at least one of the compounds of formula (Ia) or (Ib) as defined in claim 1 or 3 , and pharmaceutically acceptable salts thereof.

8. A pharmaceutical composition containing, as an active ingredient, at least one of the compounds of formula (Ia) or (Ib) as defined in claim 1 or 3 , or a pharmaceutically acceptable salt of said compounds and a pharmaceutically acceptable carrier.

9. A method for treating cancers, capable of being modulated by inhibition of the Vps34/PIK3C3 route, comprising the administration to a patient of at least one of the compounds of formula (Ia) or (Ib) as defined in claim 1 or 3 .

10. The method according to claim 9 , for treating solid or liquid tumors.

11. The method according to claim 9 , for treating cancers resistant to cytotoxic agents.

12. The method according to claim 9 , wherein the cancers are chosen among primary tumors and/or metastases including gastric, liver, kidney, ovarian, colon, prostate, lung cancers (NSCLC and SCLC), glioblastomas, thyroid, bladder, breast cancers, melanoma, lymphoid or myeloid hematopoietic tumors, sarcomas, cancers of the brain, of the larynx, of the lymphatic system, cancers of bones and of the pancreas, harmartomas.

13. A cancer chemotherapy method comprising the administration, in combination with radiotherapy or anti-tumoral agents, of at least one of the compounds of formula (Ia) or (Ib) as defined in claim 1 or 3 to a patient, wherein said cancer is capable of being modulated by inhibition of the Vps34/PIK3C3 route.

14. A method for treating type II glycogenosis (or Pompe's disease) comprising the administration to a patient of at least one of the compounds of formula (Ia) or (Ib) as defined in claim 1 or 3 .