JP5830245B2 - 光学活性のメチルヒドロキシルアミノプロパノール化合物を中間体として用いる(s)−(+)−n−メチル−3−(1−ナフチルオキシ)−3−(2−チエニル)プロピルアミンの製造方法 - Google Patents
光学活性のメチルヒドロキシルアミノプロパノール化合物を中間体として用いる(s)−(+)−n−メチル−3−(1−ナフチルオキシ)−3−(2−チエニル)プロピルアミンの製造方法 Download PDFInfo
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- ZEUITGRIYCTCEM-KRWDZBQOSA-N (S)-duloxetine Chemical compound C1([C@@H](OC=2C3=CC=CC=C3C=CC=2)CCNC)=CC=CS1 ZEUITGRIYCTCEM-KRWDZBQOSA-N 0.000 title claims description 41
- 238000004519 manufacturing process Methods 0.000 title claims description 36
- -1 methylhydroxylaminopropanol compound Chemical class 0.000 title description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 72
- YEJVVFOJMOHFRL-ZETCQYMHSA-N (1s)-3-(methylamino)-1-thiophen-2-ylpropan-1-ol Chemical compound CNCC[C@H](O)C1=CC=CS1 YEJVVFOJMOHFRL-ZETCQYMHSA-N 0.000 claims description 27
- 150000001875 compounds Chemical class 0.000 claims description 26
- 125000004432 carbon atom Chemical group C* 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 125000000217 alkyl group Chemical group 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- CWLKTJOTWITYSI-UHFFFAOYSA-N 1-fluoronaphthalene Chemical group C1=CC=C2C(F)=CC=CC2=C1 CWLKTJOTWITYSI-UHFFFAOYSA-N 0.000 claims description 7
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 7
- 230000002194 synthesizing effect Effects 0.000 claims description 7
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 6
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052794 bromium Inorganic materials 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 6
- 239000011630 iodine Substances 0.000 claims description 6
- 229910052740 iodine Inorganic materials 0.000 claims description 6
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 5
- 125000003118 aryl group Chemical group 0.000 claims description 5
- 238000003776 cleavage reaction Methods 0.000 claims description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 4
- 125000001475 halogen functional group Chemical group 0.000 claims 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims 1
- 229960002866 duloxetine Drugs 0.000 description 31
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000000243 solution Substances 0.000 description 8
- WYJOVVXUZNRJQY-UHFFFAOYSA-N 2-Acetylthiophene Chemical compound CC(=O)C1=CC=CS1 WYJOVVXUZNRJQY-UHFFFAOYSA-N 0.000 description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 125000000175 2-thienyl group Chemical group S1C([*])=C([H])C([H])=C1[H] 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005984 hydrogenation reaction Methods 0.000 description 4
- 239000000543 intermediate Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- LPNYRYFBWFDTMA-UHFFFAOYSA-N potassium tert-butoxide Chemical compound [K+].CC(C)(C)[O-] LPNYRYFBWFDTMA-UHFFFAOYSA-N 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 4
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000005160 1H NMR spectroscopy Methods 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003446 ligand Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 125000005978 1-naphthyloxy group Chemical group 0.000 description 2
- WPSFJOCEPPXFLY-UHFFFAOYSA-N 3-(methoxymethylamino)-1-thiophen-2-ylpropan-1-one;hydrochloride Chemical compound Cl.COCNCCC(=O)C1=CC=CS1 WPSFJOCEPPXFLY-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000006683 Mannich reaction Methods 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000007868 Raney catalyst Substances 0.000 description 2
- 229910000564 Raney nickel Inorganic materials 0.000 description 2
- MXGXXBYVDMVJAO-UHFFFAOYSA-N [1-[2-bis(3,5-dimethylphenyl)phosphanylnaphthalen-1-yl]naphthalen-2-yl]-bis(3,5-dimethylphenyl)phosphane Chemical compound CC1=CC(C)=CC(P(C=2C=C(C)C=C(C)C=2)C=2C(=C3C=CC=CC3=CC=2)C=2C3=CC=CC=C3C=CC=2P(C=2C=C(C)C=C(C)C=2)C=2C=C(C)C=C(C)C=2)=C1 MXGXXBYVDMVJAO-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical compound B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 description 2
- 150000004985 diamines Chemical class 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 2
- 150000004678 hydrides Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VDGXOAGMAQYDBA-UHFFFAOYSA-N n-naphthalen-1-yloxy-3-thiophen-2-ylpropan-1-amine Chemical compound C=1C=CC2=CC=CC=C2C=1ONCCCC1=CC=CS1 VDGXOAGMAQYDBA-UHFFFAOYSA-N 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- GRPOOQUUAHFLBP-QMMMGPOBSA-N (1s)-3-(methoxymethylamino)-1-thiophen-2-ylpropan-1-ol Chemical compound COCNCC[C@H](O)C1=CC=CS1 GRPOOQUUAHFLBP-QMMMGPOBSA-N 0.000 description 1
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 description 1
- 125000004169 (C1-C6) alkyl group Chemical group 0.000 description 1
- 125000004209 (C1-C8) alkyl group Chemical group 0.000 description 1
- UEGBPBSUXLGTNF-UHFFFAOYSA-N 1-thiophen-2-ylpropan-1-ol Chemical compound CCC(O)C1=CC=CS1 UEGBPBSUXLGTNF-UHFFFAOYSA-N 0.000 description 1
- 125000000041 C6-C10 aryl group Chemical group 0.000 description 1
- 0 CN(CC[C@@](c1ccc[s]1)O)O* Chemical compound CN(CC[C@@](c1ccc[s]1)O)O* 0.000 description 1
- GYDJZOFWOGCHFH-UHFFFAOYSA-N COCNCC(CC=1SC=CC1)=O Chemical compound COCNCC(CC=1SC=CC1)=O GYDJZOFWOGCHFH-UHFFFAOYSA-N 0.000 description 1
- 101710088194 Dehydrogenase Proteins 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910010082 LiAlH Inorganic materials 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000001430 anti-depressive effect Effects 0.000 description 1
- 239000000935 antidepressant agent Substances 0.000 description 1
- 229940005513 antidepressants Drugs 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009876 asymmetric hydrogenation reaction Methods 0.000 description 1
- 229910000085 borane Inorganic materials 0.000 description 1
- 238000004296 chiral HPLC Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002651 drug therapy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- USZLCYNVCCDPLQ-UHFFFAOYSA-N hydron;n-methoxymethanamine;chloride Chemical compound Cl.CNOC USZLCYNVCCDPLQ-UHFFFAOYSA-N 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000012280 lithium aluminium hydride Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 229920002866 paraformaldehyde Polymers 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000006340 racemization Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
- C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
- C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
- C07D333/06—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to the ring carbon atoms
- C07D333/14—Radicals substituted by singly bound hetero atoms other than halogen
- C07D333/20—Radicals substituted by singly bound hetero atoms other than halogen by nitrogen atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heterocyclic Compounds Containing Sulfur Atoms (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
(i)2−アセチルチオフェン、ホルムアルデヒドと一般式HNCH3(OR)で表される化合物とのマンニッヒ反応(Mannich reaction)により、一般式(I)で表される化合物を合成する工程;
(ii)一般式(I)で表される化合物をエナンチオ選択的に還元することにより、一般式(II)で表される化合物を得る工程;
(iii)一般式(II)で表される化合物のN,O−開裂反応により、一般式(III)で表される(S)−(−)−3−メチルアミノ−1−(2−チエニル)−プロパン−1−オールを合成する工程;
(iv)(S)−(−)−3−メチルアミノ−1−(2−チエニル)−プロパン−1−オールとハロナフタレンとの反応により(S)−(+)−N−メチル−3−(1−ナフチルオキシ)−3−(2−チエニル)プロピルアミン(デュロキセチン, Duloxetine(登録商標))を合成する工程。
式中、Rは水素原子、炭素数1〜8のアルキル基、又は炭素数6〜10のアリール基を示し、より好ましくは炭素数1〜4のアルキル基を示し、特に好ましくはメチル基を示し、ハロゲンは、弗素、塩素、臭素又は沃素を示す。
(1)(S)−(+)−N−メチル−3−(1−ナフチルオキシ)−3−(2−チエニル)プロピルアミンの製造方法であって、
下記一般式(II)で表される化合物のN,O−開裂反応により、
(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オールと、KOR1と、ハロナフタレンとをDMSO中で反応させることを含む(ここで、R1 は炭素数1〜6のアルキル基を示し、ハロ(halo)は弗素、塩素、臭素又は沃素を示す)ことを特徴とする製造方法。
(i)2−アセチルチオフェン、ホルムアルデヒドと一般式HNCH3(OR)で表される化合物とのマンニッヒ反応により、一般式(I)で表される化合物を合成する工程;
(ii)一般式(I)で表される化合物をエナンチオ選択的に還元することにより、一般式(II)で表される化合物を得る工程;
(iii)一般式(II)で表される化合物のN,O−開裂反応により、一般式(III)で表される(S)−(−)3−メチルアミノ−1−(2−チエニル)−プロパン−1−オールを合成する工程;
(iv)(S)−(−)−3−メチルアミノ−1−(2−チエニル)−プロパン−1−オールとハロナフタレンとの反応により(S)−(+)−N−メチル−3−(1−ナフチルオキシ)−3−(2−チエニル)プロピルアミン(デュロキセチン, Duloxetine(登録商標))を合成する工程。
3−メトキシメチルアミノ−1−(2−チエニル)−1−プロパノン塩酸塩の合成
1H NMR(400MHz,CDCl3) δ(ppm)=3.1(s,3H),3.7−3.8(br,4H),4.1(s,3H),7.2(t,J=4.5Hz,1H),7.7(d,J=4.9Hz,1H),7.9(d,J=3.5Hz,1H).
(S)−3−メトキシメチルアミノ−1−(2−チエニル)プロパン−1−オールの合成
1H NMR(400MHz,CDCl3) δ(ppm)=3.0(s,3H),3.0−3.1(m,1H),4.1(s,3H),4.0−4.1(m,3H),6.1 (dt,J=7.4,15.4Hz,1H),6.9(d,J=15.7Hz,1H), 7.0(dd,J=3.7,5.0Hz,1H),7.1(d,J=3.4Hz,1H).
(S)−(−)−3−メチルアミノ−1−(2−チエニル)−プロパン−1−オールの合成
1H NMR(400MHz,CDCl3) δ(ppm)=2.2(m,1H),2.4(m,1H),2.4(s,3H),2.8(m,2H),5.8(m,1H), 6.8(d,1H),6.9(m,1H),7.1(d,1H),7.2(d,1H), 7.3(d,1H),7.4(m,1H),7.5(m,2H),7.8(m,1H), 8.3(m,1H).
Claims (10)
- (S)−(+)−N−メチル−3−(1−ナフチルオキシ)−3−(2−チエニル)プロピルアミンの製造方法であって、
下記一般式(II)で表される化合物のN,O−開裂反応により、
前記(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オール(III)とハロナフタレンとの反応は、2.0〜4当量の範囲のハロナフタレンと、DMSOとの存在下で行われ、前記DMSOは、(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オール用量の1〜10倍の範囲の量(モル基準)で使用され、
前記(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オールとハロナフタレンとの反応の工程において、KOR 1 が使用され、前記R 1 は炭素数1〜6のアルキル基であることを特徴とする製造方法。
- 前記Rは、炭素数1〜4のアルキル基である請求項1に記載の製造方法。
- 前記Rは、メチル基である請求項2に記載の製造方法。
- 前記ハロナフタレンは、1−フルオロナフタレンである請求項1に記載の製造方法。
- 前記R1は、第三ブチル基である請求項1〜4のいずれか1項に記載の製造方法。
- 前記DMSOの使用量は、(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オールの用量の1〜5倍の範囲の量(モル基準)である請求項1〜5のいずれか1項に記載の製造方法。
- 下記一般式:
有機溶剤としてDMSOのみを用いて、(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オールと、KOR1と、ハロナフタレンとをDMSO中で反応させることを含み(ここで、R1は炭素数1〜6のアルキル基を示し、ハロは弗素、塩素、臭素又は沃素を示す)、
前記(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オール(III)と、KOR1と、ハロナフタレンとのDMSO中で行われる反応は、2.0〜4当量の範囲のハロナフタレンの存在下で行われ、前記DMSOの使用量は(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オール用量の1〜10倍の範囲の量(モル基準)であることを特徴とする製造方法。 - 前記R1は、第三ブチル基である請求項7に記載の製造方法。
- 前記ハロナフタレンは、1−フルオロナフタレンである請求項7に記載の製造方法。
- 前記DMSOの使用量は、(S)−(−)−3−メチルアミノ−1−(2−チエニル)プロパン−1−オール用量の1〜5倍の範囲の量(モル基準)である請求項7〜9のいずれか1項に記載の製造方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US12/774,933 | 2010-05-06 | ||
US12/774,933 US8530674B2 (en) | 2010-05-06 | 2010-05-06 | Process for preparing (S)-(+)-N-methyl-3-(1-naphthyloxy)-3-(2-thienyl)propylamine by using optically active methylhydroxylaminopropanol compound as intermediate |
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JP2011236195A JP2011236195A (ja) | 2011-11-24 |
JP5830245B2 true JP5830245B2 (ja) | 2015-12-09 |
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Country Status (2)
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WO2006126213A1 (en) * | 2005-05-24 | 2006-11-30 | Matrix Laboratories Ltd | An improved process for the preparation of duloxetine |
AU2006318476A1 (en) * | 2005-11-23 | 2007-05-31 | Auspex Pharmaceuticals, Inc. | Substituted aryloxypropylamines with serotoninergic and/or norepinephrinergic activity |
US7538232B2 (en) * | 2006-01-19 | 2009-05-26 | Eli Lilly And Company | Process for the asymmetric synthesis of duloxetine |
US8168805B2 (en) * | 2007-10-29 | 2012-05-01 | Sci Pharmtech, Inc | Optically active methylhydroxylaminopropanol compound and its use as intermediate for preparation of (S)-(−)-3-methylamino-1-(2-thienyl)propan-1-ol |
US7829731B2 (en) * | 2007-10-29 | 2010-11-09 | Sci Pharmtech, Inc. | Methylhydroxylaminopropanol derivative and its use as intermediate for preparation of 3-methylamino-1-(2-thienyl)propan-1-OL |
WO2009074883A2 (en) * | 2007-11-06 | 2009-06-18 | Medichem, S.A. | Improved process for preparing duloxetine |
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