描述了天然存在的呋喃衍生物地黄酮 A、B 和 C 的合成。为制备这些天然产物开发了多种替代合成策略。在路易斯酸催化下,呋喃与捕获的烯烃 1-乙酰基乙烯基 4-硝基苯甲酸酯共轭加成得到相应的加合物,分别通过三步和两步转化为地黄酮 B 和 C。它们还通过丙酮与关键的呋喃-2-碳水化合物-醛中间体缩合制备,这些中间体可以很容易地从 D-果糖中获得。双呋喃地黄酮 A 不仅通过丙酮与 5-(甲氧基甲基)呋喃-2-甲醛的双重缩合在一步程序中获得,而且通过将后者与地黄酮 B 以高总产率缩合获得。
描述了天然存在的呋喃衍生物地黄酮 A、B 和 C 的合成。为制备这些天然产物开发了多种替代合成策略。在路易斯酸催化下,呋喃与捕获的烯烃 1-乙酰基乙烯基 4-硝基苯甲酸酯共轭加成得到相应的加合物,分别通过三步和两步转化为地黄酮 B 和 C。它们还通过丙酮与关键的呋喃-2-碳水化合物-醛中间体缩合制备,这些中间体可以很容易地从 D-果糖中获得。双呋喃地黄酮 A 不仅通过丙酮与 5-(甲氧基甲基)呋喃-2-甲醛的双重缩合在一步程序中获得,而且通过将后者与地黄酮 B 以高总产率缩合获得。
Cu/MgAl<sub>2</sub>O<sub>4</sub>as Bifunctional Catalyst for Aldol Condensation of 5-Hydroxymethylfurfural and Selective Transfer Hydrogenation
作者:Kristina Pupovac、Regina Palkovits
DOI:10.1002/cssc.201300414
日期:2013.11
Copper supported on mesoporous magnesium aluminate has been prepared as noble‐metal‐free solid catalyst for aldol condensation of 5‐hydroxymethylfurfural with acetone, followed by hydrogenation of the aldol condensation products. The investigated mesoporous spinels possess high activity as solid‐base catalysts. Magnesium aluminate exhibits superior activity compared to zinc and cobalt‐based aluminates
制备了负载在介孔铝酸镁上的铜作为无贵金属的固体催化剂,用于5-羟甲基糠醛与丙酮的醛醇缩合,然后氢化醛醇缩合产物。被研究的介孔尖晶石具有高活性,可作为固体碱催化剂。与基于锌和钴的铝酸盐相比,铝酸镁具有更高的活性,可实现1:1醛醇产品的完全转化和最高81%的收率。高活性可以与铝酸镁上较高的碱性表面位点浓度相关。通过连续再生,催化剂可以循环使用而不会损失活性。着重于随后的醛醇缩合产物Cu / MgAl 2 O 4的加氢允许选择性氢化和CO键裂解,以3-羟基丁基-5-甲基呋喃为主要产物,选择性高达84%,避免了环饱和。加氢活性的分析表明,在反应进行中的顺序如下:CC>CO>Ç Ò裂解>环氢化。在转移加氢中使用2-丙醇作为溶剂也可以实现可比的活性和选择性,从而提供了部分回收丙酮和优化氢管理的可能性。
[EN] COMPOUNDS AND METHODS FOR THE PRODUCTION OF LONG CHAIN HYDROCARBONS FROM BIOLOGICAL SOURCES<br/>[FR] COMPOSÉS ET PROCÉDÉS DE PRODUCTION D'HYDROCARBURES À CHAÎNE LONGUE À PARTIR DE SOURCES BIOLOGIQUES
申请人:LOS ALAMOS NAT SECURITY LLC
公开号:WO2013040311A1
公开(公告)日:2013-03-21
The present invention is directed to the preparation of oxygenated, unsaturated hydrocarbon compounds, such as derivatives of furfural or hydroxymethyl furfural produced by aldol condensation with a ketone or a ketoester, as well as methods of deoxidatively reducing those compounds with hydrogen under acidic conditions to provide saturated hydrocarbons useful as fuels.
COMPOUNDS AND METHODS FOR THE PRODUCTION OF LONG CHAIN HYDROCARBONS FROM BIOLOGICAL SOURCES
申请人:Gordon John Cameron
公开号:US20150232394A1
公开(公告)日:2015-08-20
The present invention is directed to the preparation of oxygenated, unsaturated hydrocarbon compounds, such as derivatives of furfural or hydroxymethyl furfural produced by aldol condensation with a ketone or a ketoester, as well as methods of deoxidatively reducing those compounds with hydrogen under acidic conditions to provide saturated hydrocarbons useful as fuels.
METHOD OF CARBON CHAIN EXTENSION USING NOVEL ALDOL REACTION
申请人:Silks Louis A.
公开号:US20110040110A1
公开(公告)日:2011-02-17
Method of producing C
8
-C
15
hydrocarbons comprising providing a ketone starting material; providing an aldol starting material comprising hydroxymethylfurfural; mixing the ketone starting material and the aldol starting material in a reaction in the presence of a proline-containing catalyst selected from the group consisting of Zn(Pro)
2
, Yb(Pro)
2
, and combinations thereof, or a catalyst having one of the structures (I), (H) or (III), and in the presence of a solvent, wherein the solvent comprises water and is substantially free of organic solvents, where (I), (II) and (III) respectively are:
where R
1
is a C
1
-C
6
alkyl moiety, X═(OH) and n=2.
In (III), X may be CH
2
, sulfur or selenium, M may be Zn, Mg, or a lanthanide, and R
1
and R
2
each independently may be a methyl, ethyl, phenyl moiety.
Method Of Carbon Chain Extension Using Novel Aldol Reaction
申请人:Silks Louis A.
公开号:US20120289719A1
公开(公告)日:2012-11-15
Method of producing C
8
-C
15
hydrocarbons comprising providing a ketone starting material; providing an aldol starting material comprising hydroxymethylfurfural; mixing the ketone starting material and the aldol starting material in a reaction in the presence of a proline-containing catalyst selected from the group consisting of Zn(Pro)
2
, Yb(Pro)
2
, and combinations thereof, or a catalyst having one of the structures (I), (II) or (III), and in the presence of a solvent, wherein the solvent comprises water and is substantially free of organic solvents, where (I), (II) and (III) respectively are:
where R
1
is a C
1
-C
6
alkyl moiety, X=(OH) and n=
2
.
In (III), X may be CH
2
, sulfur or selenium, M may be Zn, Mg, or a lanthanide, and R
1
and R
2
each independently may be a methyl, ethyl, phenyl moiety.