手性环丙烷／双内酯衍生物的合成

具有四个新手性中心的螺环／环丙烷类化合物4在甲醇／丙酮／5％HC1反应介 质中加热回流，可以同时消除两个手性辅基，形成半缩醛化合物的混合物。后者与 甲醇发生缩醛化反应，生成双甲氧基缩醛混合物5。经柱层析分离和重结晶得到手 性环丙烷／双内酯衍生物，螺{1-溴－4－甲氧基－5－氧杂－6－氧代双环[3.1.0] 己烷－2，2′－（3′－亲核氧基－4′－甲氧基丁内酯）}（6），化学产率60％－ 84％，光学纯度de≥98％。经元素分析，[α]D^20,UV,IR,^1H NMR,^13C NMR， MS以及X－射线四圆衍射测定，确认了它们的化学结构、立体化学和绝对构型。此 环丙烷／双内酯双甲氧基衍生物的合成反应可以为活性官能团的引入、合成复杂结 构的手性化合物提供新的方法和途径。     

手性3-溴-2(5H)-呋喃酮的合成及其串联的不对称Michael加成 反应的研究

研究了新的手性试剂,5-(l-孟氧基)-3-溴-呋喃酮(5a)的合成及其与亲核性醇发生的串联不对称双Michael加成/分子内亲取代反应。通过此反应,一举生成了四个新的手性中心,得到了一般方法难以合成的含有多个手性中心的丁内酯并螺－环丙烷类化合物8a～8d。详细报道了8a～8d的合成方法以及它们的[α]、IR、UV、^1^HNMR、^13^CNMR、MS、元素分析等结构分析数据。此不对称双Michael加成/分子内亲核取代反应可以为某些新的光学活性螺－环内丙烷类化合物以及某些复杂结构的分子提供合成策略。     

氨基醇砌块用于螺/环丙环类手性化合物的合成

手性氨基醇砌块3与5-(l-孟氧基)-3-溴-2(5H)-呋喃酮手性合成子4通过串联的不对称双Michael加成/分子内亲核取代反应,得到了具有四个新的手性中心的氨基醇手性砌块/螺环/环丙烷类化合物7(44%～57%,de≥98%)。通过元素分析,[α]^20~D,UV,IR,^1HNMR,^13CNMR,MS确认了它们的化学结构。本工作可以为含有某些活性官能团的多手性中心的复杂结构化合物提供新的合成策略。     

新手性源5-(l-孟氧基)-3-溴-2(5H)-呋喃酮的合成和结构

文中深入研究了5-(l-孟氧基)-3-溴-2(5H)-呋喃酮新手性源(5a)的合成方法及其不对称合成反应。5a不仅制备方法简便,光学纯度单一,而且它作为稳定的Michael受体,可与碳、氧、氮、硫等不同的亲核试剂发生串联的Michael加成/分子内亲核取代反应,制备得到含有多个手性中心的双环[3.3.0^3^,^7]-5-辛烯类化合物、双环[3.1.0^3^,^5]-己烷类化合物和螺-环丙烷类化合物。本文报道了该手性呋喃酮5a的合成和构型测定。     

无溶剂法合成4,6,10,12,16,18,22,24-八羟基-2,8,14,20-四-{(联三-(3-苯基-2,4,8,10-四氧杂螺[5.5]十一烷基))-(4-(2-(4,6,10,12,16,18,22,24-八羟基)杯芳基)苯基)}杯芳烃螺环树形大分子化合物

以对苯二甲醛、丙二腈为原料, 合成对苯二甲醛单缩醛, 再与季戊四醇反应得到了2,4,8,10-四氧杂-2,9-二(4-二氰基乙烯基苯基)螺[5.5]十一烷, 经水解, 与丙二腈反应, 制备了中间体2,4,8,10-四氧杂-2-(4-二氰基乙烯基苯基)-9-(4-甲酰基苯基)螺[5.5]十一烷(3). 用乙酸酐保护的对苯二甲醛单缩醛与间苯二酚反应, 制备了杯芳烯中间体(6). 将化合物6与过量的化合物3反应, 得到中间体7, 经水解后与过量的化合物6反应, 得到了4,6,10,12,16,18,22,24-八羟基-2,8,14,20-四-{(联三-(3-苯基-2,4,8,10-四氧杂螺[5.5]十一烷基))-(4-(2-(4,6,10,12,16,18,22,24-八羟基)杯芳基)苯基)}杯芳烃螺环树形大分子化合物(9). 总收率为12.7%. 产物结构用IR, 1H NMR, 13C NMR, MS 和元素分析进行了表征, 对影响反应的因素进行了讨论.     

多手性中心的螺-环丙烷类化合物的合成

研究了 5 (l 孟氧基 ) 3 溴 2 ( 5H) 呋喃酮新手性源 ( 1)与亲核性醇类化合物发生的串联不对称双Michael加成 /分子内亲核取代反应 ,通过此反应 ,一举生成了 4个新的手性中心 ,得到了一般方法难以合成的含有多个手性中心的丁内酯并螺 环丙烷类化合物 5a～ 5d .详细报道了 5a～ 5d的合成方法以及它们的 [α],IR ,UV ,1HNMR ,13 CNMR ,MS和元素分析等结构分析数据 .经X 四圆衍射确定了 5 (l 孟氧基 ) 3 溴代丁内酯并 [3,4,1″,2″] 螺 [4 .2 ] [环丙烷 3″,3′ ( 4′ 甲氧基 5′ 孟氧基丁内酯 ) ]( 5a)的立体化学结构 .此不对称串联反应为进一步设计某些光学活性的复杂结构的分子提供了重要的合成途径     

甘油糖脂的合成I.1,2-二－O－脂酰基－3－O－（α-D-吡喃半乳糖基）－sn-甘油的合成

采用一种有效的方法合成了具有不同链长的二脂酰基α-D-半乳糖型甘油糖脂 。将半乳糖烯丙苷化，重结晶得到α－D－半乳糖烯丙苷。随后将糖环的羟基用苄 基保护，再利用OsO4/NMO(N-甲基－N－氧吗啉）的二羟基化条件将1－O烯丙基氧化 成为邻二羟基，得到3－O－（2′，3′，4′，6′－四－O－苄基－α－D－吡喃半 乳糖基）－sn-甘油。其与不同链长的脂酰氯进行脂酰化反应，然后氢解去掉苄基 得到五种二脂酰基α-D-半乳糖苷基甘油。利用^1H NMR,^13C NMR,2D NMR,IR和MS 对化合物的结构进行了确证。     

手性螺-环丙烷化合物中手性辅基的区域性转换反应的研究

通过串联的不对称双Michael加成/分子内亲取代反应,一举得到了具有四个新手性中心的螺环/环丙烯类化合物(4).4在丙酮-5%HCl溶液中50℃下发生区域选择性单水解转换反应,得到螺[1-溴-4-羟基-5-氧杂-6-氧代双环[3.3.0]已-2,3'-(4'-亲核氧基-5'-孟氧基丁内酯)](5),化学产率53%～69%,光学纯度d.e≥98%.4在甲醇/TsOH催化下,实现了区域选择性单醇解转换反应,得到螺[1-溴-4-甲氧基-5-氧杂-6-氧代双环[3.1.0]已烷-2,3'-(4'-亲核氧基-5'-孟氧基丁内酯)](6),化学产率50%～78%,光学纯度d.e.≥98%.经元素分析,[α]D^20,UV,IR,1^HNMR,13^CNMR,MS以及X射线四圆衍射测定,确认了它们的化学结构。     

手性螺-环丙烷化合物中手性辅基的区域性转换反应的研究

通过串联的不对称双Michael加成/分子内亲取代反应,一举得到了具有四个新手性中心的螺环/环丙烯类化合物(4).4在丙酮-5%HCl溶液中50℃下发生区域选择性单水解转换反应,得到螺[1-溴-4-羟基-5-氧杂-6-氧代双环[3.3.0]已-2,3'-(4'-亲核氧基-5'-孟氧基丁内酯)](5),化学产率53%～69%,光学纯度d.e≥98%.4在甲醇/TsOH催化下,实现了区域选择性单醇解转换反应,得到螺[1-溴-4-甲氧基-5-氧杂-6-氧代双环[3.1.0]已烷-2,3'-(4'-亲核氧基-5'-孟氧基丁内酯)](6),化学产率50%～78%,光学纯度d.e.≥98%.经元素分析,[α]D^20,UV,IR,1^HNMR,13^CNMR,MS以及X射线四圆衍射测定,确认了它们的化学结构。     

含三氟甲基手性毗邻双螺环氧化吲哚的合成

以10 mol%β-ICD作催化剂,靛红衍生的MBH-碳酸酯与3-(2,2,2-三氟次乙基)氧化吲哚为原料,经不对称[3+2]环加成反应,合成了10个含三氟甲基的手性毗邻双螺环氧化吲哚类化合物(3a^3j),收率68%~98%,dr值97/3~>99/1,ee值96%~>99%,其结构经^1H NMR,^13C NMR确证。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.