CN114988990A - 一种香兰素的制备方法 - Google Patents
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- MWOOGOJBHIARFG-UHFFFAOYSA-N vanillin Chemical compound COC1=CC(C=O)=CC=C1O MWOOGOJBHIARFG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- FGQOOHJZONJGDT-UHFFFAOYSA-N vanillin Natural products COC1=CC(O)=CC(C=O)=C1 FGQOOHJZONJGDT-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 235000012141 vanillin Nutrition 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 58
- LHGVFZTZFXWLCP-UHFFFAOYSA-N guaiacol Chemical compound COC1=CC=CC=C1O LHGVFZTZFXWLCP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 40
- ZENOXNGFMSCLLL-UHFFFAOYSA-N vanillyl alcohol Chemical compound COC1=CC(CO)=CC=C1O ZENOXNGFMSCLLL-UHFFFAOYSA-N 0.000 claims abstract description 34
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- 238000006482 condensation reaction Methods 0.000 claims abstract description 28
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- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 24
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- DSVGQVZAZSZEEX-UHFFFAOYSA-N [C].[Pt] Chemical compound [C].[Pt] DSVGQVZAZSZEEX-UHFFFAOYSA-N 0.000 claims abstract description 9
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- 239000000203 mixture Substances 0.000 claims description 7
- -1 N-hydroxy-tetrabutylpiperidine Chemical compound 0.000 claims description 6
- 239000002585 base Substances 0.000 claims description 4
- CVWUIWZKLYGDNJ-UHFFFAOYSA-N tripentyl phosphite Chemical compound CCCCCOP(OCCCCC)OCCCCC CVWUIWZKLYGDNJ-UHFFFAOYSA-N 0.000 claims description 4
- 150000004057 1,4-benzoquinones Chemical class 0.000 claims description 3
- WAMKWBHYPYBEJY-UHFFFAOYSA-N duroquinone Chemical compound CC1=C(C)C(=O)C(C)=C(C)C1=O WAMKWBHYPYBEJY-UHFFFAOYSA-N 0.000 claims description 3
- 239000008098 formaldehyde solution Substances 0.000 claims description 3
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical class OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 3
- 150000003053 piperidines Chemical class 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
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- IWYDHOAUDWTVEP-UHFFFAOYSA-N R-2-phenyl-2-hydroxyacetic acid Natural products OC(=O)C(O)C1=CC=CC=C1 IWYDHOAUDWTVEP-UHFFFAOYSA-N 0.000 description 3
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- 240000006982 Guaiacum sanctum Species 0.000 description 1
- 235000004440 Guaiacum sanctum Nutrition 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- 235000009499 Vanilla fragrans Nutrition 0.000 description 1
- 244000263375 Vanilla tahitensis Species 0.000 description 1
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/18—Preparation of ethers by reactions not forming ether-oxygen bonds
- C07C41/30—Preparation of ethers by reactions not forming ether-oxygen bonds by increasing the number of carbon atoms, e.g. by oligomerisation
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
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Abstract
本发明公开了一种香兰素的制备方法,步骤包括:(1)将愈创木酚、甲醛、碱、水混合,发生缩合反应,得到含3‑甲氧基‑4‑羟基‑苯甲醇的缩合反应液;(2)向步骤(1)的缩合反应液中加入铂炭催化剂(Pt/C)、助剂,然后通入含氧气体,使3‑甲氧基‑4‑羟基‑苯甲醇与发生氧化反应,生成香兰素。本发明提供的方法该路线工艺流程简化,缩合反应过程愈创木酚转化率高,避免了原料重复利用,有效降低了生产成本,提升了生产效率;同时本发明氧化后直接得到香兰素,不需要进行脱羧工序,原子利用率提高,并且能有效减少温室气体排放。
Description
技术领域
本发明涉及一种香兰素的制备方法,属于香料化学合成技术领域。
背景技术
香兰素,俗称香草醛,化学名为3-甲氧基-4-羟基苯甲醛,具有香荚兰特有的香气,通常为白色或浅黄色结晶状粉末,是世界上产量最大的合成香料,广泛应用于食品与香料加工行业。由与香兰素的应用广泛性以及在各行业的重要性,香兰素的合成工艺一直是长期以来的研究热点。
目前合成香兰素的工艺有三种,一种是用愈创木酚与乙醛酸缩合反应生成扁桃酸后采用氧化铜或空气作为氧化剂,氧化扁桃酸再脱羧后制备香兰素,该工艺技术成熟,但流程复杂,路线长,缩合反应过程反应原料转化率低,氧化反应及脱羧过程会产生大量温室气体。CN1016190188公开了一种化学氧化法制备香兰素的方法,该方法收率高,但涉及的物料为高固含率的固液混合物,对设备分离性能要求较高。
第二种工艺是采用愈创木酚-二甲基苯胺法,该工艺生产三废较多,目前已基本被淘汰。
第三种是生物合成法,主要是利用植物细胞培养法或酶法,制备香兰素,但目前该技术仍然处于实验室研究阶段,不具备量产条件。
现有成熟工艺愈创木粉-乙醛酸法制备的香兰素的主要缺点是缩合过程原料转化率低,氧化与脱羧过程会产生大量的温室气体,碳原子利用率低。
发明内容
针对现有技术中存在的上述问题,本发明的目的是提供一种香兰素的制备方法,能够克服现有愈创木酚-乙醛酸法制备香兰素工艺存在的缩合过程原料转化率低,氧化与脱羧过程产生大量的温室气体,碳原子利用率低等缺点。
为实现上述目的,本发明采用如下技术方案:
一种香兰素的制备方法,步骤包括:
(1)将愈创木酚、甲醛、碱、水混合,发生缩合反应,得到含3-甲氧基-4-羟基-苯甲醇的缩合反应液;
(2)向步骤(1)的缩合反应液中加入铂炭催化剂(Pt/C)、助剂,然后通入含氧气体,使3-甲氧基-4-羟基-苯甲醇与发生氧化反应,生成香兰素。
本发明中,步骤(1)所述的甲醛与愈创木酚的摩尔比为1.05-1.4:1,优选1.1-1.2:1。
本发明中,步骤(1)所述的碱与愈创木酚摩尔比为1.2-2.0:1,优选1.3-1.6:1;
优选地,所述的碱为无机强碱,选自氢氧化钠、氢氧化钾,优选为氢氧化钠。
本发明中,步骤(1)所述的水用量为愈创木酚质量的1.5-2.6倍,优选1.8-2.2倍。
本发明中,步骤(1)所述的甲醛为甲醛溶液,优选采用浓度37wt%的甲醛水溶液。
本发明中,步骤(1)所述的缩合反应,反应温度为20.0-80.0℃,优选40.0-60.0℃;反应停留时间为0.25-2.0h,优选0.5-1.0h。
本发明中,步骤(2)所述的铂炭催化剂(Pt/C)用量为步骤(1)的缩合反应液质量的0.5-2.5wt%,优选1.0-1.5wt%;
优选地,所述的铂炭催化剂中Pt含量为1.0-10.0wt%,优选2.5-5.0wt%。
本发明中,步骤(2)所述的助剂用量为铂炭催化剂质量的1-10wt%,优选2-5wt%;
所述的助剂选自苯醌类化合物、亚磷酸酯类化合物、哌啶类化合物中的任意一种或至少两种的组合,优选为2,3,5,6-四甲基苯醌、亚磷酸三戊烯酯、四甲氧基苯醌、N-羟基-四丁基哌啶中的任意一种或至少两种的组合,更优选四甲氧基苯醌。
本发明中,步骤(2)所述的含氧气体,可以为纯氧气或者含氧混合气体;
优选地,所述含氧气体,其中氧气含量为15.0-100.0%,优选20.0-50.0%,选自空气、氮氧混合气;
优选地,所述的含氧气体采用连续进料方式,单位体积反应器内气体通入量为0.1-0.8min-1,优选0.2-0.4min-1,此处单位即L/(min·L反应器),简化为min-1;并调控所述的反应压力为0.0-1000.0KPaG,优选500.0-800.0KPaG。
本发明中,步骤(2)所述的氧化反应,反应液的pH值为10.0-14.0,优选11.0-12.0,具体可由步骤(1)制备的缩合反应液采用酸或碱调控使pH在所需范围内,例如滴加稀酸(硫酸、盐酸等)或稀碱(氢氧化钠等),该方法为本领域常规操作,本发明没有特别要求。
本发明中,步骤(2)所述的氧化反应,反应温度为45.0-65.0℃,优选50.0-60.0℃;反应时间为12.0-36.0h,优选18.0-24.0h;反应压力为0.0-1000.0KPaG,优选500.0-800.0KpaG;
优选地,所述的氧化反应开始前,系统预先采用氮气置换。
本发明由愈创木酚、甲醛缩合、氧化制香兰素的工艺,反应过程可用下式表示:
本发明人对氧化反应过程进行了系统性研究后,发现在使用Pt/C催化剂催化氧化3-甲氧基-4-羟基-苯甲醇氧化成香兰素的过程中,反应速率缓慢,且收率较低。主要原因是:(1)与苯环相连的甲基上的羟基活性较弱,难以被氧气直接氧化;(2)当3-甲氧基-4-羟基-苯甲醇被氧化生成香兰素后,香兰素易发生过度氧化副反应,生成香草酸。本发明实验发现,在添加适量具有大共轭体系的特定结构苯醌类化合物、亚磷酸酯类化合物、哌啶类化合物作为助催化剂后,反应速率及香兰素选择性可以得到显著提高其中相同时间反应转化率可以由30%提高到99%,反应时间可缩短3倍,香兰素选择性可提升至91%以上,香草酸选择性降低至8%以下。
上述反应过程中,氧气在Pt的表面被催化活化,并吸附在催化剂表面,反应体系中具有大共轭体系的助催化剂能快速与催化剂表面的氧结合,生成活性氧的过渡态产物。活性氧的过渡态产物能选择性地将羟基氧化为醛基,而不能将醛基进一步氧化为羧基,助催化剂在反应历程中能加快活性氧的传递效率,从而提升反应速率及选择性。
与现有技术相比,本发明具有以下突出的效果:
本发明提供的方法该路线工艺流程简化,缩合反应过程愈创木酚转化率高,避免了原料重复利用,有效降低了生产成本,提升了生产效率;同时本发明氧化后直接得到香兰素,不需要进行脱羧工序,原子利用率提高,并且能有效减少二氧化碳排放。
附图说明
图1为实施例1制备的香兰素产品(油相)HPLC色谱图。
具体实施方式
下面对本发明的技术方案作进一步的说明,但并不局限于此,凡是对本发明技术方案进行修改或者等同替换,而不脱离本发明技术方案的范围,均应涵盖在本发明的保护范围中。
HPLC分析条件:色谱型号:岛津LC-20A;进样量为5μL;UV检测波长为310nm;柱温箱:40℃;流速:0.4ml/min;选用外标法定量。
实施例中主要原料规格及来源如下,其它若无特别说明均为普通市售原料:
试剂名称 | 试剂规格 | 生产厂家 |
愈创木酚 | AR | 阿拉丁 |
37%甲醛/水溶液 | AR | 西陇试剂 |
Pt/C催化剂 | AR | 凯特立斯 |
MIBK | AR | 科密欧 |
氢氧化钠 | AR | 科密欧 |
实施例1
(1)缩合步骤:称量500g(4mol)愈创木酚、288g(7.2mol)NaOH、1152g水加入到3L三口烧瓶中,搅拌均匀后,采用恒温控温系统控温至20℃,称量349g质量分数为37%的甲醛/水溶液(4.3mol),一次性加入到烧瓶中,开始反应;0.5h后,反应结束,取样测得,原料转化率99.5%,3-甲氧基-4-羟基-苯甲醇选择性92.9%。
(2)氧化步骤:将步骤(1)的缩合反应液pH值调节为14,然后转移至5L鼓泡釜中,加入28.61gPt/C催化剂(Pt含量7.5wt%)、2.304g 2,3,5,6-四甲基苯醌,氮气置换后,用电加热套升温至45℃,连续通入流量为0.75L/min(单位体积反应器内气体通入量为0.15min-1)的氮氧混合气(氧气体积分数为20%),控制反应压力为900KPaG,反应36h后,降温至室温,测得原料转化率98.1%,香兰素选择性92.4%、香草酸选择性6.2%。HPLC分析结果如附图1。
实施例2
(1)缩合步骤:称量500g(4mol)愈创木酚、208g(5.2mol)NaOH、832g水加入到3L三口烧瓶中,搅拌均匀后,采用恒温控温系统控温至60℃,称量389g(4.8mol)质量分数为37%的甲醛/水溶液,一次性加入到烧瓶中,开始反应;2h后,反应结束,取样测得,原料转化率98.4%,3-甲氧基-4-羟基-苯甲醇选择性91.4%。
(2)氧化步骤:将缩合反应液pH值调节为11.5,然后转移至5L鼓泡釜中,加入48.2gPt/C催化剂(Pt含量1wt%)、1.664g四甲氧基苯醌,氮气置换后,用电加热套升温至50℃,通入流量为4L/min(单位体积反应器内气体通入量为0.8min-1)的氮氧混合气(氧气体积分数为50%),控制反应压力为0KPaG,反应30h后,降温至室温,测得原料转化率99%,香兰素选择性92.5%,香草酸选择性5.8%。
实施例3
(1)缩合步骤:称量500g(4mol)愈创木酚、232g(5.8mol)NaOH、928g水加入到3L三口烧瓶中,搅拌均匀后,采用恒温控温系统控温至70℃,称量357g(4.4mol)质量分数为37%的甲醛/水溶液,一次性加入到烧瓶中,开始反应;1h后,反应结束,取样测得,原料转化率99.4%,3-甲氧基-4-羟基-苯甲醇选择性91.2%。
(2)氧化步骤:将缩合反应液pH值调节为11.0,然后转移至5L鼓泡釜中,加入15.1gPt/C催化剂(Pt含量10wt%)、0.3g亚磷酸三戊烯酯,氮气置换后,用电加热套升温至55℃,通入流量为2L/min(单位体积反应器内气体通入量为0.4min-1)的氧气,控制反应压力为650KPaG,反应12h后,降温至室温,测得原料转化率99.5%,香兰素选择性92.3%,香草酸选择性6.01%。
实施例4
(1)缩合步骤:称量500g(4mol)愈创木酚、256g(6.4mol)NaOH、1000g水加入到3L三口烧瓶中,搅拌均匀后,采用恒温控温系统控温至50℃,称量422g(4.4mol)质量分数为37%的甲醛/水溶液,一次性加入到烧瓶中,开始反应;0.35h后,反应结束,取样测得,原料转化率98.8%,3-甲氧基-4-羟基-苯甲醇选择性92%。
(2)氧化步骤:将缩合反应液pH值调节为12.0,然后转移至5L鼓泡釜中,加入44.03gPt/C催化剂(Pt含量5wt%)、1.38g N-羟基-四丁基哌啶,氮气置换后,用电加热套升温至50℃,通入流量为1.5L/min(单位体积反应器内气体通入量为0.3min-1)的氮气氧气混合气(氧气体积分数为75%),控制反应压力为250KPaG,反应18h后,降温至室温,测得原料转化率98.4%,香兰素选择性92.1%,香草酸选择性6.5%。
实施例5
(1)缩合步骤:称量500g(4mol)愈创木酚、280g(5mol)KOH、800g水加入到3L三口烧瓶中,搅拌均匀后,采用恒温控温系统控温至80℃,称量341g(4.2mol)质量分数为37%的甲醛/水溶液,一次性加入到烧瓶中,开始反应;1.5h后,反应结束,取样测得,原料转化率99.6%,3-甲氧基-4-羟基-苯甲醇选择性92.1%。
(2)氧化步骤:将缩合反应液pH值调节为10.5,然后转移至5L鼓泡釜中,加入27.6gPt/C催化剂(Pt含量1.75wt%)、1.38g亚磷酸三戊烯酯,氮气置换后,用电加热套升温至47.5℃,通入流量为1.0L/min(单位体积反应器内气体通入量为0.2min-1)的氮气氧气混合气(氧气体积分数为35%),控制反应压力为800KPaG,反应24h后,降温至室温,测得原料转化率99.6%,香兰素选择性92%,香草酸选择性7.2%。
实施例6
(1)缩合步骤:称量500g(4mol)愈创木酚、320g(8mol)NaOH、1280g水加入到3L三口烧瓶中,搅拌均匀后,采用恒温控温系统控温至40℃,称量454g(5.6mol)质量分数为37%的甲醛/水溶液,一次性加入到烧瓶中,开始反应;0.25h后,反应结束,取样测得,原料转化率99.7%,3-甲氧基-4-羟基-苯甲醇选择性91.4%。
(2)氧化步骤:将缩合反应液pH值调节为10.0,然后转移至5L鼓泡釜中,加入12.8gPt/C催化剂(Pt含量2.5wt%)0.894g N-羟基-四丁基哌啶,氮气置换后,用电加热套升温至62.5℃,通入流量为0.5L/min(单位体积反应器内气体通入量为0.1min-1)的氮气氧气混合气(氧气体积分数为15%),控制反应压力为500KPaG,反应15h后,降温至室温,测得原料转化率98.1%,香兰素选择性91.8%,香草酸选择性8%。
实施例7
(1)缩合步骤:称量500g(4mol)愈创木酚、268.8(4.8mol)gKOH、768g水加入到3L三口烧瓶中,搅拌均匀后,采用恒温控温系统控温至20℃,称量373g(4.6mol)质量分数为37%的甲醛/水溶液,一次性加入到烧瓶中,开始反应;0.75h后,反应结束,取样测得,原料转化率98.8%,3-甲氧基-4-羟基-苯甲醇选择性91.1%。
(2)氧化步骤:将缩合反应液pH值调节为13.0,然后转移至5L鼓泡釜中,加入18.33gPt/C催化剂(Pt含量3.5wt%),1.83g N-羟基-四丁基哌啶,氮气置换后,用电加热套升温至60℃,通入流量为3L/min(单位体积反应器内气体通入量为0.6min-1)的氮气氧气混合气(氧气体积分数为17.5%),控制反应压力为1000KPaG,反应21h后,降温至室温,测得原料转化率98.8%,香兰素选择性91.3%,香草酸选择性5%。
对比例1
参照实施例1方法制备香兰素,不同之处仅在于:步骤(1)中的碱替换为等质量的Na2CO3,其它操作均不变,取样测得,原料转化率65%,3-甲氧基-4-羟基-苯甲醇选择性23%、香草酸选择性65%。
对比例2
参照实施例1方法制备香兰素,不同之处仅在于:步骤(1)中的碱替换为等质量的三乙胺,其它操作均不变,取样测得,原料转化率25%,3-甲氧基-4-羟基-苯甲醇选择性72%、香草酸选择性18%。
对比例3
参照实施例1方法制备香兰素,不同之处仅在于:步骤(2)中,不加入助剂,其它操作均不变,反应结束后取样分析,测得原料转化率40%,香兰素选择性60.06%、香草酸选择性37.2%。
对比例4
参照实施例1方法制备香兰素,不同之处仅在于:步骤(2)中,助剂替换为3-氰基吡啶,其它操作均不变,反应结束后取样分析,测得原料转化率75.8%,香兰素选择性70.2%、香草酸选择性26.9%。
对比例5
参照实施例1方法制备香兰素,不同之处仅在于:步骤(2)中,催化剂替换为氧化锰,其它操作均不变,反应结束后取样分析,测得原料转化率69%,香兰素选择性85%、香草酸选择性10.3%。
Claims (10)
1.一种香兰素的制备方法,其特征在于,步骤包括:
(1)将愈创木酚、甲醛、碱、水混合,发生缩合反应,得到含3-甲氧基-4-羟基-苯甲醇的缩合反应液;
(2)向步骤(1)的缩合反应液中加入铂炭催化剂、助剂,然后通入含氧气体,使3-甲氧基-4-羟基-苯甲醇与发生氧化反应,生成香兰素。
2.根据权利要求1所述的制备方法,其特征在于,步骤(1)所述的甲醛与愈创木酚的摩尔比为1.05-1.4:1,优选1.1-1.2:1。
3.根据权利要求1或2所述的制备方法,其特征在于,步骤(1)所述的碱与愈创木酚摩尔比为1.2-2.0:1,优选1.3-1.6:1;
优选地,所述的碱选自氢氧化钠、氢氧化钾,优选为氢氧化钠。
4.根据权利要求1-3任一项所述的制备方法,其特征在于,步骤(1)所述的水用量为愈创木酚质量的1.5-2.6倍,优选1.8-2.2倍;
步骤(1)所述的甲醛为甲醛溶液,优选采用浓度37wt%的甲醛水溶液。
5.根据权利要求1-4任一项所述的制备方法,其特征在于,步骤(1)所述的缩合反应,反应温度为20.0-80.0℃,优选40.0-60.0℃;反应停留时间为0.25-2.0h,优选0.5-1.0h。
6.根据权利要求1-5任一项所述的制备方法,其特征在于,步骤(2)所述的铂炭催化剂用量为步骤(1)的缩合反应液质量的0.5-2.5wt%,优选1.0-1.5wt%;
优选地,所述的铂炭催化剂中Pt含量为1.0-10.0wt%,优选2.5-5.0wt%。
7.根据权利要求1-6任一项所述的制备方法,其特征在于,步骤(2)所述的助剂用量为铂炭催化剂质量的1-10wt%,优选2-5wt%;
所述的助剂选自苯醌类化合物、亚磷酸酯类化合物、哌啶类化合物中的任意一种或至少两种的组合,优选为2,3,5,6-四甲基苯醌、亚磷酸三戊烯酯、四甲氧基苯醌、N-羟基-四丁基哌啶中的任意一种或至少两种的组合,更优选四甲氧基苯醌。
8.根据权利要求1-7任一项所述的制备方法,其特征在于,步骤(2)所述的含氧气体为纯氧气或者含氧混合气体;
优选地,所述含氧气体,其中氧气含量为15.0-100.0%,优选20.0-50.0%,选自空气、氮氧混合气;
优选地,所述的含氧气体采用连续进料方式,单位体积反应器内气体通入量为0.1-0.8min-1,优选0.2-0.4min-1。
9.根据权利要求1-8任一项所述的制备方法,其特征在于,步骤(2)所述的氧化反应,反应液的pH值为10.0-14.0,优选11.0-12.0。
10.根据权利要求1-9任一项所述的制备方法,其特征在于,步骤(2)所述的氧化反应,反应温度为45.0-65.0℃,优选50.0-60.0℃;反应时间为12.0-36.0h,优选18.0-24.0h;反应压力为0.0-1000.0KPaG,优选500.0-800.0KpaG;
优选地,所述的氧化反应开始前,系统预先采用氮气置换。
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CN115124413A (zh) * | 2022-02-18 | 2022-09-30 | 山东新和成药业有限公司 | 一种羟基香茅醇制备羟基香茅醛的方法 |
CN115124413B (zh) * | 2022-02-18 | 2023-11-28 | 山东新和成药业有限公司 | 一种羟基香茅醇制备羟基香茅醛的方法 |
CN117209369A (zh) * | 2023-09-18 | 2023-12-12 | 山东泓瑞医药科技股份公司 | 香兰素的制备方法 |
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