Process for the production of 4-(17α-alkoxymethyl-17β-substituted 3-oxoestra-4,9-dien-11β-yl) benzaldehyde-(1E)-oxime derivatives
This invention relates to a process for the production of 4-(17α-alkoxymethyl-17β-substituted-3-oxoestra-4,9-dien-11β-yl)benzaldehyde-(1E)-oxime derivatives of general formula (I) in which R means an amino group, an O—C 1-7 -alkyl- or O-aryl radical, an S—C 1-7 -alkyl- or S-aryl radical, an NH—C 1-7 -alkyl- or NH-aryl radical or an N-di-C 1-7 -alkyl radical, and R 1 means a hydrogen atom or a C 1-6 -alkyl radical, which yields the target compounds of formula (I) with high yield and selectivity.
1. A process for preparing a 4-(17α-alkoxymethyl-17β-substituted-3-oxoestra-4,9-dien-11β-yl)benzaldehyde-(1E)-oxime compound of formula (I)
in which
R means an amino group, an O—C 1-7 -alkyl- or O-aryl radical, an S—C 1-7 -alkyl- or S-aryl radical, an NH—C 1-7 -alkyl- or NH-aryl radical or an N-di-C 1-7 -alkyl radical,
R 1 means a hydrogen atom or a C 1-6 -alkyl radical,
R 2 means a C 1-4 -alkyl radical, and
R 3 means a C 1-6 -alkyl radical,
comprising reacting a benzadoxime compound of formula (II)
in which
R 1 , R 2 and R 3 have the meanings provided above,
with chloroformic acid trichloromethyl ester or phosgene in an inert solvent in the presence of a tert-amine compound at a temperature of −35 to +30° C. to form the chloroformic acid compound of formula (III),
in which
R 1 , R 2 and R 3 have the meanings provided above,
and reacting the chloroformic acid compound of formula (III) with a C 1-7 -alkyl- or aryl alcohol, C 1-7 -alkyl- or aryl thioalcohol or C 1-7 -alkyl- or arylamine or a di-C 1-7 -alkylamine compound to form a 4-(17α-alkoxymethyl-17β-substituted-3-oxoestra-4,9-dien-11β-yl)benzaldehyde-(1E)oxime compound of formula (I).
2. A process according to claim 1 , wherein R 1 means a C 1-3 -alkyl radical.
3. A process according to claim 1 , wherein R 2 means a C 1-3 -alkyl radical.
4. A process according to claim 1 , wherein R 3 means a C 1-3 -alkyl radical.
5. A process according to claim 1 , wherein R means an amino-, methoxy-, ethoxy-, phenoxy-, methylthio-, ethylthio-, NH-methyl-, NH-ethyl-, NH-propyl-, NH-phenyl- or NH-tetrahydropyranyl group.
6. A process according to claim 1 , wherein the following compound of formula (I) is prepared:
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(ethyloxy)carbonyl]oxime,
4-[17β-Hydroxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[O-(ethyloxy)carbonyl]oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(methoxy)carbonyl]oxime,
4-[17β-Hydroxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(methoxy)carbonyl]oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(ethylamino)carbonyl]oxime,
4-[17β-Hydroxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(ethylamino)carbonyl]oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(ethylthio)carbonyl]oxime,
4-[17β-Hydroxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(ethylthio)carbonyl]oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(methylthio)carbonyl]oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(phenyloxy)carbonyl]oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(tetrahydropyranylamino)carbonyl]oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(amino)carbonyl]oxime, or
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-[(O-(propylamino)carbonyl]oxime.
7. A process according to claim 1 , wherein the tert-amine compound is triethylamine.
8. A process according so claim 1 , wherein R 1 means a methyl group.
9. A process according to claim 1 , wherein R 2 means a methyl group.
10. A process according go claim 1 , wherein R 3 means a methyl group.
11. A process according to claim 1 , wherein the inert solvent is an aromatic solvent, toluene, ether, tetrahydrofuran or methyl-tert-butyl ether.
12. A process according to claim 1 , wherein the benzadoxime compound of formula (II) is reacted with chloroformic acid trichloromethyl ester or phosgene at a temperature −35° C.
13. A process according to claim 1 , further comprising isolating and purifying a compound of formula (I) by recrsystalization or chromatography or preparative layer chromatography.