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Preparation method of (-)-huperzine A

A technology for huperzine A and pharmaceutical preparations, applied in the field of splitting huperzine A

Inactive Publication Date: 2013-07-31
ZHEJIANG WANBANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The racemate of huperzine A is resolved into its optical isomer (-)-huperzine A by the method of resolution with a resolving agent.

Method used

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  • Preparation method of (-)-huperzine A

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Preparation of (-)-huperzine A-D-dibenzoyl tartrate

[0130] 7.3g ( + )-huperzine A diastereomer mixture was suspended in a mixed solvent of acetone and water, 8.9g D-(-)-dibenzoyl tartaric acid was added at 20°C, stirred for 1 hour, filtered, and the solid was dissolved in absolute ethanol Recrystallization gave 8.5 g of (-)-huperzine A-D-dibenzoyl tartrate.

[0131] Yield: 82%; HPLC purity: 99% (310nm); optical purity: 99.5%. Melting point: 175-177°C

[0132] 1H NMR(400MHz,DMSO d6)δ7.96(d,J=7.6Hz,2H),7.79(d,J=9.6Hz,1H),7.61-7.65(m,1H),7.47-7.51(m,2H ),6.15(d,J=9.6Hz,1H),5.68(s,1H),5.41-5.46(m,2H),3.56(s,1H),2.63-2.68(m,1H),2.51-2.55( m,1H),2.11-2.31(m,2H),1.63(d,J=6.4Hz,3H),1.49(s,3H).

Embodiment 2

[0134] Preparation of (-)-Huperzine A

[0135] Add 8.5g (-)-huperzine A-D-dibenzoyl tartaric acid to 42.5ml water, adjust the pH to 9.0-9.3 with 40% sodium hydroxide, continue to stir for 1 hour, filter, and dissolve the solid in 10mL water Wash, recrystallize with 95% ethanol, and dry in vacuo to obtain 3.6 g of (-)-huperzine A.

[0136] Yield: 74%; HPLC purity: 99.6% (310nm); optical purity: 99.5%. Melting point: 217-219°C

[0137] 1 H NMR (400MHz, CDCl 3 )δ13.16(br,1H),7.92(d,J=9.6Hz,1H),6.43(d,J=9.6Hz,1H),5.47-5.52(m,1H),5.41-5.43(m,1H ),3.62(s,1H),2.88-2.93(m,1H),2.74-2.78(m,1H),2.12-2.19(m,2H),1.69(d,J=6.8Hz,3H),1.56( s,3H).

Embodiment 3

[0139] Preparation of (-)-Huperzine A-D-tartrate

[0140] Will 6g ( + )-Huperzine A diastereomer mixture was suspended in a mixed solvent of acetone and water, 3.1g (D)-tartaric acid was added at 20°C, stirred for 1 hour, filtered, and the solid was recrystallized from absolute ethanol to obtain (- )-huperzine A-D-tartrate 4g.

[0141] Yield: 51%; HPLC purity: 98% (310nm); optical purity: 95%. Melting point: 182-185°C

[0142] 1 H NMR (400MHz,D 2 O)δ7.87(d,J=9.6Hz,1H),6.63(d,J=9.6Hz,1H),5.63-5.64(m,1H),5.51-5.56(m,1H),4.51(s, 2H),3.88(s,1H),3.04-3.10(m,1H),2.79-2.84(m,1H),2.68-2.72(m,1H),2.53-2.57(m,1H),1.82(d, J=6.4Hz,3H),1.65(s,3H).

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Abstract

The invention relates to a preparation method of (-)-huperzine A, which comprises the following steps: preparing (+)-huperzine A mixture obtained by chemical synthesis and chiral acid into huperzine A chiral acid salt under optimum conditions, recrystallizing the chiral acid salt with organic solvent, and carrying out alkali ionization to obtain optically pure (-)-huperzine A. The method is convenient to operate and suitable for industrial production; and the chemical purity and optical purity of the (-)-huperzine A obtained by the method are respectively greater than 99.5%, thereby satisfying the requirements for the purity of the active pharmaceutical ingredients in pharmaceutical industry.

Description

technical field [0001] The invention belongs to the field of medicinal chemistry, and in particular relates to a method for resolving huperzine A. In the method, the racemic huperzine A is prepared into a chiral acid salt, and then further prepared into (-) - Huperzine A. technical background [0002] Huperzine A is a highly active alkaloid isolated from Huperzia serrata (Thunb) Thev.]. Usually its optical isomer (-)-huperzine A is used as the active ingredient of the drug, and the structural formula of (-)-huperzine A is as follows: [0003] [0004] (-)-Huperzine A, its chemical name is: (5R,9R,11E)-5-amino-11-ethylene-5,6,9,10-tetrahydro-7-methyl-5, 9-methylenecyclooctatetra[b]pyridin-2-(1H)-one. [0005] (-)-Huperzine A is a highly efficient and highly selective reversible acetylcholinesterase inhibitor, which has the function of improving learning and memory, and can be used for the treatment of various neuropsychiatric diseases. [0006] (-)-Huperzine A Tablets ...

Claims

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Application Information

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IPC IPC(8): C07D221/22A61K31/4748A61P25/28
CPCC07D221/22
Inventor 赵守明陈平彭少平庄银枪石荣珍谢金生谢蔚华
Owner ZHEJIANG WANBANG PHARMA
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