(-)-双(薄荷基甲酰基)苯基氧化膦的合成及在自由基光聚合中的螺旋选择性

以苯基二氯化膦和薄荷基甲酸为原料, 合成了一种手性双酰基膦氧化物光引发剂(-)-双(薄荷基甲酰基)苯基氧化膦. 采用核磁共振谱、 质谱及元素分析确定了该化合物的结构, 并测定了其螺旋诱导能力. 结果表明, (-)-BMPPO在引发自由基光聚合大位阻的单体甲基丙烯酸-1-苯基二苯并环庚酯(PDBSMA)的反应中具有螺旋选择性. 所得聚合物具有高度全同结构并显示出光学活性, 说明该聚合物形成了稳定的单手性螺旋链构象. 降低单体与引发剂的投料比及提高聚合温度有利于增加反应的螺旋选择性. 在手性薄荷醇溶剂中, 由(2,4,6-三甲基苯甲酰基)二苯基氧化膦(TPO)引发单体PDBSMA的光聚合反应也具有螺旋选择性, 但螺旋选择性很小.     

新型N-P配体的合成、表征及其在氢转移反应中的应用

利用2,3-二(二苯膦氧基)-1,3-丁二烯与胺的迈克尔加成反应,合成了单胺基及环胺基改性的有机氧化膦,经有机硅烷还原,制备出胺基取代的膦配体,所得化合物经NMR及单晶X射线衍射分析.考察了所得配体与Ru(PPh3)3Cl2组成的催化体系在苯乙酮氧转移反应中的催化活性,发现氧化膦与Ru原位形成的催化剂比其还原态的三价膦组成的催化剂催化活性还高,二胺基取代的二氧化膦配体具有较高的催化活性,TON可达273.而采用先制备催化剂再催化反应时配体6的钌络合物催化活性TON可达352.     

树枝状聚酰胺胺负载TEMPO的合成及其催化分子氧氧化醇的性能

以乙二胺和丙烯酸甲酯为原料,经过重复Michael和酯氨解反应,制备出二代(2.0 G)树枝状聚酰胺胺(PAMAM).PAMAM与2,2,6,6-四甲基哌啶酮氮氧自由基经缩合、还原将PAMAM与2,2,6,6-四甲基哌啶氮氧自由基(TEMPO)键连,得到PAMAM负载的TEMPO(PAMAM-TEMPO).采用1H NMR、13C NMR以及FT-IR等手段对中间体及最终产物进行了表征.将PAMAM-TEMPO与CuBr2以及2,2-联吡啶结合构成催化体系,用于分子氧为氧化剂的醇的选择性氧化反应,结果表明该体系对苄基以及烯丙基伯醇的氧化显示出良好的催化活性和选择性.结果还证明,TEMPO的负载使氧化产物醛很容易与催化体系分离,而且催化剂可以循环使用.     

两种氮杂环丁烷类药物中间体的合成

1-二苯甲基-3-羟基氮杂环丁烷(1)经过对甲苯磺酰氯取代、叠氮化及还原反应合成了药物中间体--1-二苯甲基-3-氨基氮杂环丁烷(4);1经过氧化、氰基化与还原反应合成了1-二苯甲基-3-羟基-3-氨甲基氮杂环丁烷(8).4和8的结构经1H NMR表征.     

O-烷基α-(取代苯氧乙酰氧基)烃基膦酸盐的合成与生物活性

为了研究O-烷基α-(取代苯氧乙酰氧基)烃基膦酸衍生物的结构活性关系,以取代苯氧乙酸为起始原料,经氯化亚砜氯化后得中间体2,然后与不同取代的α-羟基烃基膦酸酯(1)反应制备关键中间体3,再与碘化钠或溴化锂反应,合成了14个未见文献报道的O-烷基α-(取代苯氧乙酰氧基)烃基膦酸盐4.通过1H NMR,IR,MS和元素分析对所合成的化合物进行了结构表征.初步的生物活性测试结果表明:大多数目标化合物具有较好的除草活性或杀菌活性.化合物4a在1.5 kg/ha剂量下对所测单、双子叶植物的抑制率均达到了100%;在50μg/g的剂量下,化合物4h~4m对油菜菌核菌和黄瓜灰霉菌的抑制率达到90%以上.     

脂蛋白脂酶激活剂艾溴利平类似物的合成

合成了两个新型的艾溴利平类似物——N-2 -硝基-4-氯苯基-4-[(膦酸二乙酯基)甲基]苯甲酰肼(5,总收率28.1％)和N-2-四氮唑基-4-氯苯基-4-[(膦酸二乙酯基)甲基]苯甲酰胺(7,总收率30.5％).以对氯甲基苯甲酸为原料,经酯化、水解和酰氯反应制得中间体4-[(膦酸二乙酯基)甲基]苯甲酰氯(4);4与2-硝基-4-氯苯肼盐酸盐反应合成了5.4先与2-氨基-5-氯苯腈反应制得N-2-氰基-4-氯苯基-4-[(膦酸二乙酯基)甲基]苯甲酰胺(6);6再与叠氮化钠反应合成了7.其结构经1 H NMR和IR表征.     

L-薄荷基-β-D-半乳糖苷的合成新方法

首次报道了硫代糖苷法合成L-薄荷基-β-D-半乳糖苷。半乳糖经过乙酰化、硫代、脱乙酰基和苯甲酰基化反应,转变成供体异丙基-2,3,4,6-四-O-苯甲酰基-1-硫-β-D-半乳糖苷。该供体与L-薄荷醇偶联及脱保护,获得了L-薄荷基-β-D-半乳糖苷。所有的产品通过NMR、MS等方法进行了结构表征。通过TG方法,探讨了所合成的L-薄荷基-β-D-半乳糖苷的热失重过程。     

多羟基甾醇25(R)-异螺甾环-5-烯-2β,3α,19-三醇的合成

以薯蓣皂素为原料, 经过磺酰酯化、N-溴代丁二酰亚胺(NBS)氧化加成、Pb(OAc)₄远程氧化关环、消去反应、间氯过氧苯甲酸(mCPBA)氧化、高氯酸开环及锌粉还原7步反应, 合成多羟基甾体25(R)-异螺甾环-5-烯-2β,3α,19-三醇. 并用IR, ¹H NMR, ¹³C NMR, MS及元素分析对各中间体及目标化合物进行了表征.     

α[O-烷基-O'-烷基(苯基)二硫代磷(膦)酸酯基]异戊酸间-苯氧基-α'-氰基苄酯的合成

本文合成了三类十个含磷拟除虫菊酯类新化合物-α-二硫代磷(膦)酸酯基异戊(乙)酸间-苯氧基-α'氰基苄酯,研究了其纯化条件.对部分中间体的制备方法作了改进.产物的结构经IR,^1H NMR 及元素分析证实,测定了部分产物的MS.对波谱中"异常"现象进行了讨论.     

超声波促进双(2,4,6-三甲基苯甲酰基)苯基氧化膦的合成

以苯基二氯化膦为主要原料,经还原取代、偶联、氧化三步反应合成了双(2,4,6-三甲基苯甲酰基)苯基氧化膦,收率70%,其结构经1HNMR和MS表征。改进了关键中间体苯基二钠化膦的合成方法,用微米钠粒取代碱金属锂、丁基锂等,大大节省了成本。     

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.