Method for the production of 4-(17$g(a)-methyl substituted 3-oxoestra-4 9-dien-11$g(b)-yl)benzaldehyd-(1e or 1z)-oximes
The invention relates to a process for the production of 4-(17α-methyl-substituted 3-oxoestra-4,9-dien-11β-yl)benzaldehyde-(1E or 1Z)-oximes of general formula (I), in which R 1 is a hydrogen atom, a C 1-6 -alkyl radical or a C n F 2n+1 radical, whereby n is 1, 2 or 3, R 2 is a C 1-4 -alkyl radical, X is an OH group in E- or Z-position, and Y is an OC 1-6 -alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2+1 group, whereby n is 1, 2 or 3, which provides the target compounds of formula (I) with a high yield and good selectivity
1. A process for preparing a 4-(17α-methyl-substituted 3-oxoestra-4,9-dien-11β-yl) benzaldehyde-(1E or 1Z)-oxime of formula (I)
in which
R 1 is a hydrogen atom, a C 1-6 -alkyl radical or a C n F 2n+1 radical,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group,
X is an OH group in E- or Z-position,
Y is an OC 1-6 -alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2n+1 group, and
n is 1, 2 or 3,
comprising
converting a 3,3-dimethoxy-estra-5(10),9(11)-en-17-one compound of formula (IX)
in which
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group,
with an active methylene reagent in an inert solvent into a spiroepoxide compound of formula (X)
in which
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group,
cleaving the 17-spiroepoxy group of the compound of formula (X) with an alkali or alkaline-earth alcoholate, alkali or alkaline-earth thiol alcoholate or a trifluoroalkyl alcohol and potassium-tert-butanolate in an inert solvent, and forming a 17α-CH 2 Y compound of formula (XI)
in which
R 1 is a hydrogen atom,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group, and
Y is an OC 1-6 -alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2n+1 group,
optionally reacting the 17β-hydroxyl group of the compound of formula (XI) with an alkyl halide or fluoroalkyl iodide in the presence of a strong base in an inert solvent to form a 17β-ether of formula (XI″),
in which
R 1 is a C 1-6 -alkyl radical or a C n F 2n+1 radical,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group, and
Y is an OC 1-6 -alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2n+1 group,
epoxidizing the compound of formula (XI) or (XI″) on the 5(10)-double bond thereof, producing a mixture of 5α, 10α-epoxy- and 5β, 10β-epoxy-17α-methyl-substituted estr-9(11)-ene-3,3-dimethyl ketals of formula (XII)
in which
R 1 is a hydrogen atom, a C 1-6 -alkyl radical or a C n F 2n+1 radical,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group, and
Y is an OC 1-6 -alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2n+1 group,
reacting the compound of formula (XII) with a 4-bromobenzaldehyde ketal, magnesium and Cu(I)Cl at a temperature of between −35°C. and room temperature form a 3,3-dimethoxy-5α-hydroxy-17α-methyl-substituted 11α,β-benzaldehydedimethyl ketal of formula (XIII)
in which
R 1 is a hydrogen atom, a C 1-6 -alkyl radical or a C n F 2n+1 radical,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group, and
Y is an OC 1-6 -alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2n+1 group,
subjecting the compound of formula (XIII) to acid hydrolysis to cleave any protective groups, to form a mixture of 11α,β-benzaldehyde compounds of formula (XIV)
in which
R 1 is a hydrogen atom, a C 1-6 -alkyl radical or a C n F 2n+1 radical,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group, and
Y is an OC 1-6 -alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2n+1 group,
isolating by crystallizing a pure 11β-benzaldehyde compound, and
converting the aldehyde function of said 11β-benzaldehyde compound by a hydroxylammonium salt in the presence of a base at room temperature into a mixture of E/Z-benzaldoximes of formula (I).
2. A process according to claim 1 , further comprising separating the mixture of the E/Z-benzaldoximes of formula (I) into E or Z-benzaldoximes by recrystallization and/or by chromatography.
3. A process according to claim 1 , wherein R 1 is a C 1-3 -alkyl radical.
4. A process according to claim 1 , wherein R 2 is a C 1-3 -alkyl radical.
5. A process according to claim 1 , wherein Y is an OC 1-3 -alkyl radical or an SC 1-3 -alkyl radical.
6. A process according to claim 1 , wherein
4-[17β-Hydroxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime,
4-[17β-Hydroxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1Z-oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime,
4-[17β-Methoxy-17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benz-aldehyde-1Z-oxime,
4-[17β-Ethoxy-(17α-(methoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime,
4-[17β-Hydroxy-17α-(ethoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime,
4-[17β-Methoxy-17α-(ethoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime,
4-[17β-Hydroxy-17α-(isopropyloxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime,
4-[17β-Methoxy-17α-(isopropyloxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime,
4-[17β-Hydroxy-17α-(ethylthiomethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime, or
4-{17β-Hydroxy-17α-(1,1,1-trifluoroethoxymethyl)-3-oxoestra-4,9-dien-11β-yl]benzaldehyde-1E-oxime
is prepared.
7. A process according to claim 1 , wherein R 1 is a methyl group or a trifluoromethyl group.
8. A process according to claim 1 , wherein R 2 is a methyl group or a trifluoromethyl group.
9. A process according to claim 1 , wherein Y is a methoxy, ethoxy, isopropyloxy, methylthio, ethylthio, or trifluoroethoxy group.
10. A process according to claim 1 , wherein R 2 is a methyl group.
11. A process according to claim 1 , wherein R 2 is a C 1-4 -alkyl radical.
12. A process according to claim 1 , wherein Y is a methoxy, ethoxy, isopropyloxy, methylthio, or ethylthio group.
13. A process according to claim 1 , wherein the isolated 11β-benzaldehyde compound is a compound of the following formula
wherein R 1 is a hydrogen atom or a C 1-6 -alkyl radical.
14. A compound of formula (I),
wherein
R 1 is a C n F 2n+1 radical,
n is 1, 2 or 3,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group,
X is an OH group in E- or Z-position, and
Y is an OC 1-6 alkyl group, an SC 1-6 -alkyl group or an OCH 2 C n F 2n+1 group.
15. A compound of formula (I),
wherein
Y is an OCH 2 C n F 2n+1 group,
n is 1, 2 or 3,
R 1 is a hydrogen atom, a C 1-6 -alkyl radical or a C n F 2n+1 radical,
R 2 is a C 1-4 -alkyl radical or a trifluoromethyl group, and
X is an OH group in E- or Z-position.
16. A compound according to claim 14 , wherein R 2 is a C 1-4 -alkyl radical.
17. A compound according to claim 15 , wherein R 2 is a C 1-4 -alkyl radical.
18. A compound according to claim 15 , wherein R 1 is a C 1-6 -alkyl radical or a C n F 2n+1 radical.
19. A compound according to claim 14 , wherein n is 1.
20. A compound according to claim 15 , wherein n is 1.