Process for preparing alpha-damascone

一种三烯、二甲基十一的技术，应用在制备ɑ‑突厥酮领域，能够解决降低总收率、总收率不令人满意、不适合柠檬醛有效生产α-突厥酮等问题，达到减少副产物的量、工艺适用性简单且便宜的效果

Pending Publication Date: 2018-04-17
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, these methods usually require an additional isomerization step to obtain the desired α-turkone, which further reduces the overall yield
[0011] Due to unsatisfactory overall yields, these methods are not suitable for the efficient production of α-turkone from citral, especially for process-scale production

Method used

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  • Process for preparing alpha-damascone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] Example 1: Synthesis of 6,10-dimethylundec-1,5,9-trien-4-ol from citral (step a)

[0148] Add allyl magnesium chloride (362.6ml, 2M in THF, 0.72mol) dropwise to a stirred solution of citral (100g, 0.65mol) in dry THF (750ml) while keeping the temperature between 0°C and 5°C . After the allyl magnesium chloride was completely added, the reaction mixture was stirred at 0°C for 1 hour, and the progress of the reaction was monitored by TLC. After the reaction was completed, the mixture was quenched by adding saturated ammonium chloride solution (500 ml) at 0-10°C. The aqueous layer was extracted with ethyl acetate (3×50 ml), and the combined organic layer was concentrated to obtain 127 g of compound 2 (99.5%).

[0149] 1 HNMR(300MHz, CDCl 3 )δ1.53(s,3H),1.61(s,6H),1.94-2.07(m,4H),2.18-2.23(m,2H),4.34-4.36(m,1H),5.01-5.14(m, 4H), 7.72-5.75 (m, 1H).

Embodiment 2

[0150] Example 2: Synthesis of 6,10-dimethylundec-1,5,9-trien-4-one using TEMPO / iron(III) nitrate nonahydrate / NaCl (step b)

[0151] Add iron (III) nitrate nonahydrate (2.0g, 5.1mmol, 0.1 equivalent), TEMPO (0.79g, 5.1mmol, 0.1 equivalent) and solid NaCl (0.29g, 51mmol, 0.1 equivalent) to 50ml of toluene at 25°C . The 6,10-dimethylundec-1,5,9-trien-4-one (10.0 g, 51 mmol, 1 equivalent) obtained in Example 1 was added to the mixture at 25° C. Stir for 3 hours under oxygen atmosphere (O 2 The gas continuously passes through the reaction mixture). The reaction was monitored by TLC and HPLC, showing a conversion rate of 50%. After stirring for 3 hours, add an additional amount of iron (III) nitrate nonahydrate (2.0g, 5.1mmol, 0.1 equivalent), TEMPO (0.79g, 5.1mmol, 0.1 equivalent), NaCl (0.29g) at 25°C , 5.1 mmol, 0.1 equivalent) was added to the reaction mixture, and then the reaction mixture was stirred for another 2 hours. After consumption of almost 95% of the starting materi...

Embodiment 3

[0153] Example 3: Synthesis of 6,10-dimethylundec-1,5,9-trien-4-one using 4-OH TEMPO / iron(III) nitrate nonahydrate / NaCl (step b)

[0154] Add iron (III) nitrate nonahydrate (13.3g, 32.9mmol, 0.1 equivalent), 4-hydroxy TEMPO (5.7g, 32.9mmol, 0.1 equivalent) and solid NaCl (1.9g, 32.9 mmol, 0.1 equivalent). The 6,10-dimethylundec-1,5,9-trien-4-ol (64.0 g, 329.8 mmol, 1 equivalent) obtained in Example 1 was added to the mixture at 25°C and Stir for 3 hours at 45℃ under oxygen atmosphere (O 2 The gas continuously passes through the reaction mixture). The reaction was monitored by TLC and HPLC, showing a conversion rate of 50%. After stirring for 3 hours, add an additional amount of iron(III) nitrate nonahydrate (13.3g, 32.9mmol, 0.1 equivalent), 4-hydroxy TEMPO (5.7g, 32.9mmol, 0.1 equivalent) and NaCl at 45°C (1.9 g, 32.9 mmol, 0.1 equivalent) was added to the reaction mixture, and then the reaction mixture was stirred for another 2 hours. After consumption of almost 95% of the ...

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Abstract

The present invention relates to a process for preparing 1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one, which comprises: a) providing 6,10-dimethylundeca-1,5,9-trien-4-ol, b) oxidizing 6,10-dimethylundeca-1,5,9-trien-4-ol provided in step a) with an oxidizing agent in the presence of at least one organic nitroxyl radical, at least one nitrate compound and an inorganic solid to yield 6,10-dimethylundeca-1,5,9- trien-4-one, c) reacting the 6,10-dimethylundeca-1,5,9-trien-4-one obtained in step b) with an acid to yield 1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one.

Description

[0001] The present invention relates to a method for preparing 1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one (ɑ-turketone), which comprises providing 6 ,10-Dimethylundec-1,5,9-trien-4-ol, oxidize 6,10-dimethylundec-1,5,9-trien-4-ol with an oxidizing agent Into 6,10-dimethylundec-1,5,9-trien-4-one and make 6,10-dimethylundec-1,5,9-trien-4-one and Acid reaction. Background technique [0002] 1-(2,6,6-Trimethylcyclohex-2-en-1-yl)but-2-en-1-one (α-turkone) is an aromatic substance found in various essential oils. Due to its unique organoleptic properties, α-turkone has great commercial value as a flavor or fragrance. In particular, α-turketone is widely used as a fragrance chemical in deodorants and perfumes. [0003] Today, the vast majority of the required α- or β-turketones are synthesized from unsaturated aldehydes or ketones, respectively, for example, from citral, cyclocitral, or cyclic ketones that are available in large quantities from natural and / or petrochemical sour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/39C07C403/16C07C49/203
CPCC07C45/39C07C2601/16C07C403/16C07C49/203
Inventor S·鲁德纳尔T·芬伦S·欣达勒卡尔N·潘萨里A·D·罗伊V·N·斯瓦米纳坦
Owner BASF SE
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