共查询到19条相似文献,搜索用时 109 毫秒
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薄荷醇是工业上应用广泛的一类重要的环萜醇.光学活性的左旋薄荷醇在医药卫生方面可用作清凉剂、止痒剂、杀菌剂等;在香料行业是需求量最大的环状单萜醇,可用作日化香精的调配剂,还能充作多种食品的调味剂;其需求量正大幅度增加,因此寻求一种好的拆分外消旋体薄荷醇的方法是极其重要的.主要综述了目前国内外薄荷醇拆分的一些方法,比较了这些拆分方法的优缺点,其中生物酶法拆分是一个很有发展潜力的方法. 相似文献
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薄荷醇是一种用途很广的环状单萜烯醇 ,其合成原料有天然旋光性化合物和非旋光的石油化学品。讨论了薄荷醇的几种合成方法 ,提出了利用异戊二烯为原料合成薄荷醇是今后生产薄荷醇的主要路线 相似文献
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旋光活性胺在有机化合物的拆分和立体化学的研究方面有着广泛的应用。这种胺有的来源于天然产物,如某些生物碱(马钱子碱、番木鳖碱、奎宁、辛可宁等),也可由合成产物经拆分得到,如L-或D-α-苯乙胺。此外,还可用某些易得的天然产物作原料来制备。我们在此介绍的L-盖胺就是从便宜易得的L-(艹孟)醇(薄荷醇)经氧化、肟化及还原三步反应制得的。 相似文献
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核苷类抗乙肝病毒药物研究最新进展及其合成方法 总被引:1,自引:0,他引:1
综述了近年来主要的核苷类抗乙肝病毒药物的研究进展及其合成方法。现有的核苷类药物主要包括了拉米夫定、阿德福韦酯、恩替卡韦,它们对于乙肝病患者都具有一定疗效。对于拉米夫定的合成,引入薄荷醇作为手性拆分试剂,可直接得到旋光性的拉米夫定,整个反应的原料有来源,适合工业化生产。阿德福韦酯最早由美国Starrett等人合成并公开的。目前合成阿德福韦酯的主要方法,都是以腺嘌呤为起始原料,所不同的是在进行侧链的合成时有所改变。此外,还介绍了恩替卡韦的合成方法。 相似文献
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介绍了l-薄荷醇的性质、应用与最近几年国内市场对l-薄荷醇的需求情况。着重阐述了4条l-薄荷醇合成路线及其研究进展。4条路线分别是:经由香茅醛、经由l-薄荷酮、经胡薄荷酮和经百里酚合成l-薄荷醇,香茅醛、l-薄荷酮、胡薄荷酮和百里酚在路线中可作为起始原料或中间产物。其中,以月桂烯经香茅醛合成l-薄荷醇以及由百里酚直接合成l-薄荷醇的路线,目前已实现工业化生产。l-薄荷醇的合成大多需要以天然产物为原料,价格较高。而以百里酚等石化产品为原料的合成路线虽较短,但得到的异构体较多,l-薄荷醇的收率相对较低。松节油作为可再资源,来源广泛,价廉易得,以其为原料的合成路线将具有的潜在的应用价值。 相似文献
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Sandra Vorlov UweT. Bornscheuer Ian Gatfield Jens‐Michael Hilmer Heinz‐Juergen Bertram RolfD. Schmid 《Advanced Synthesis \u0026amp; Catalysis》2002,344(10):1152-1155
The stereoselective synthesis of L ‐menthol is an attractive process in the flavor and fragrance industry. One promising way to obtain optically pure menthol is the enantioselective hydrolysis of menthol esters under enzymatic catalysis. We developed an effective and highly enantioselective method for the synthesis of L ‐(−)‐menthol (>99% EE) by hydrolyzing the key industrial starting compound, d, l ‐menthyl benzoate. The enzyme of choice was the lipase from Candida rugosa (CRL). While commercially available preparations of this lipase showed only minor selectivity (E=15), excellent enantiomeric purity (E>100) was achieved using the heterologously expressed isoenzyme LIP1. 相似文献
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主要研究二环[4.2.0]辛酮中间体薄荷醇衍生物的合成工艺.以(-)-1 R,2S,5R-8-苯薄荷醇和(-)-1R,2S,5R -8-萘薄荷醇为原料,通过酯化反应合成目标化合物,产率分别为58.7%、92%.其结构经 1HNMR、13CNMR进行了表征,并对标题化合物的构象稳定性和晶体结构进行了研究. 相似文献
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研究在微波辐射条件下 ,以手性助剂天然薄荷醇与 5 -羟基 -2 (5 H ) -呋喃酮反应 ,合成 5 -(1 -氧基 ) -2 (5 H ) -呋喃酮。获得了微波的功率 40 %、反应时间 1 0 0 min、苯为溶剂 ,薄荷醇 /5 -羟基 -2 -(5 H )呋喃酮为 1 /1 .7,产率 78.6%的好结果 相似文献
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Florentina Neaţu Simona Coman Vasile I. Pârvulescu G. Poncelet Dirk De Vos Pierre Jacobs 《Topics in Catalysis》2009,52(9):1292-1300
The synthesis of menthol from citronellal was studied on bifunctional Ir/Beta zeolite catalysts, prepared via impregnation
of Beta zeolite with different concentrations of Ir. The results show that Beta zeolites, impregnated with Ir, catalyze the
one-pot full conversion of citronellal to menthol by consecutive acid-catalyzed cyclization and Ir-catalyzed hydrogenation.
The best results (95% selectivity for the menthol isomers, of which 75% is the desired (±)-menthol) were recorded on 3% Ir/Beta
zeolite catalyst. In contrast with earlier studies, 0.05 g Ir/Beta catalyst per mL of substrate leads to complete and selective
substrate transformation. The textural properties, acidity and hydrogenation function were studied by liquid N2 adsorption–desorption, FT-IR, XPS and hydrogen chemisorption techniques. To clarify the mechanism of the cyclization of citronellal,
tests were also performed using zeolites with different acidity and loaded with other metals (Pt, Pd, Rh, Ru). 相似文献
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The heterogeneously catalyzed epimerization of menthol stereoisomers is an important step in the synthesis of (–)‐menthol by the Haarmann and Reimer process. For an accurate design of a technical reactor, the intrinsic kinetics as well as pore diffusion limitations have to be taken into account. The epimerization consists of a complex reaction network and so a simple approach using effectiveness factors based on Thiele moduli is not possible. In this work, a method is presented to simultaneously calculate the change in concentrations in the bulk phase as well as within the porous particles with time (fixed bed reactor) or local position (batch reactor). A commercially available numerical software was used to solve the differential equations. 相似文献