Synthesis method for lupeol

A technology of lupeol and its synthesis method, which is applied in the production of steroids, bulk chemicals, organic chemistry, etc., can solve the problems of difficult application of industrial production of lupeol, harsh reaction conditions, and low yield, and achieve high yield High, less experimental steps, and the effect of reducing production costs

Inactive Publication Date: 2015-07-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This preparation method is difficult to apply to industrial producti...

Method used

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  • Synthesis method for lupeol
  • Synthesis method for lupeol
  • Synthesis method for lupeol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]

[0038] Place 40 mg of 3-O-acetyl betulin aldehyde in a single-necked bottle at room temperature, add 5 ml of diethylene glycol and heat to dissolve, add 30 ul of hydrazine hydrate, stir at 80°C for 3 hours. After TLC monitoring and other raw material spots completely disappeared, 32 mg of sodium hydroxide was added, and stirred at 200° C. for 5 h. TLC monitors that the reaction is complete, stop the reaction, add 20ml of ethyl acetate to the reaction solution to dissolve, wash with 40ml of saturated saline three times, combine the organic layer and concentrate under reduced pressure, and use petroleum ether: ethyl acetate = 15:1 as the eluent for silica gel By column chromatography, 20 mg of lupeol was obtained, with a yield of 20%. 1 H NMR (500MHz, CDCl 3 ): δ4.71(s,1H),4.58(s,1H),3.21(dd,1H,J=5H Z ),2.40(m,1H),1.89-1.98(m,1H),1.70(s,3H),1.05(s,3H),0.98(s,3H),0.97(s,3H),0.85(s,3H ),0.81(s,3H),0.78(s,3H). 13 C NMR (125MHz, CDCl 3 )δ150.97,109.34,79.01,55.29,50...

Embodiment 2

[0040]

[0041] Place 30 mg of 3-O-acetyl betulin aldehyde in a single-necked bottle at room temperature, add 5 ml of DMSO (dimethyl sulfoxide) and heat to dissolve, add 30 ul of hydrazine hydrate, stir at 80 ° C for 3 h. After TLC monitoring and other raw material spots completely disappeared, 23 mg of potassium tert-butoxide was added and stirred at 140° C. for 5 h. TLC (petroleum ether: ethyl acetate = 4:10) monitored the completion of the reaction, stopped the reaction, added 20ml ethyl acetate to the reaction liquid to dissolve, washed with 40ml saturated brine three times, combined the organic layer and concentrated under reduced pressure, and then mixed with petroleum ether: acetic acid Ethyl ester=15:1 was used as the eluent to perform silica gel column chromatography to obtain 10 mg of lupeyl alcohol with a yield of 34%. 1 H NMR (500MHz, CDCl 3 ): δ4.71(s,1H),4.58(s,1H),3.21(dd,1H,J=5H Z ),2.40(m,1H),1.89-1.98(m,1H),1.70(s,3H),1.05(s,3H),0.98(s,3H),0.97(s,3H),0.8...

Embodiment 3

[0043]

[0044] 100mg of 3-O-acetyl betulin was dissolved in 5ml of ethanol at room temperature, 200ul of hydrazine hydrate was added, heated and refluxed for 3h, the reaction was stopped and cooled to room temperature, 20ml of ice water was added to separate out the precipitation to obtain 100mg of intermediate hydrazone, (yield 98 %.1H NMR (500MHz, CDCl3): δ7.24(s,1H) 5.16(s,2H), 4.72(s,1H), 4.61(s,1H), 4.80(dd,1H, J=5HZ), 2.53(m, 1H), 2.06(s, 3H), 1.70(s, 3H), 0.98(s, 6H), 0.86(s, 6H), 0.865(s, 3H) 13C NMR(500MHz, CDCl3)δ170. 98,150.26,150.08,109.78,80.95,55.39,50.33,50.17,49.26,48.03,42.81,40.95,38.39,38.35,37.79,37.28,37.10,34.24,32.66,29.96,27.96,25.24,23.70,21.30,20.86,19.15, 18.20, 16.49, 16.15, 16.05, 14.63; MS(ESI)[M+H] + 497.5

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Abstract

The invention belongs to the research field of bioactive substance preparation processes, and provides a synthesis method of lupeol. The lupeol is prepared by reduction reaction in the presence of a reducer and strong alkaline by taking betulinaldehyde or a 3-ester derivative thereof as raw materials. The method is less in experimental steps, simple to operate and high in yield, and the production cost of the lupeol is remarkably reduced.

Description

technical field [0001] The present invention relates to a new synthetic method to prepare lupeol. Background technique [0002] Lupeol (lupeol) belongs to pentacyclic triterpenoids and exists in many kinds of fruits, vegetables and medicinal plants. Lupeol has a wide range of biological activities, such as anti-inflammatory, anti-angiogenic, anti-microbial, anti-proliferative, hypolipidemic, etc. (Siddique, H.R., Saleem, M., 2011, Life Sci.88, 285-93), with high Value. [0003] [0004] At present, the method of obtaining lupeol is still limited to extracting it from plants, but because its content in plants is generally not high, the extraction cost is very high and it is difficult to produce in large quantities. People such as Karavadhi and Corey reported a kind of synthetic method of lupeol in 2009, this method is with complex structure (S)-epoxy acetate compound as raw material, through coupling, stereoselective cyclization, reduction, protection , alkylation, depr...

Claims

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Application Information

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IPC IPC(8): C07J63/00
CPCY02P20/55C07J63/008
Inventor 刘苏友马大友徐飞刘丽君
Owner CENT SOUTH UNIV
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