富马酸单正烷基酯的合成和表征

马来酸酐(1)和C1～C8正烷基醇(2a～2h)发生醇解反应生成马来酸单正烷基酯,后者接着在无水AlCl3存在下加热发生异构化反应,得到富马酸C1～C8单正烷基酯(3a～3h),醇解反应和异构化反应的总收率79.2%～87.3%。其结构经ESI-MS,IR和1H NMR表征。     

Total synthesis of +/--hyphodermins A and D

An efficient formal synthesis of (+/-)-hyphodermins A and D, metabolites of Hyphoderma radula, has been completed in 12 and 11 steps, respectively. The tricyclic carbon skeleton of enone 6 was rapidly assembled from diester 11 via an alpha brominationn-elimination sequence followed by anhydride formation. Regioselective reduction of the lactone group of enone 6 with LiAlH(t-BuO) 3 gave lactol 15. Lactol 15 was converted in two steps to (+/-)-hyphodermin D, without the need for complex protection-deprotection strategies. Lactol 15 was converted in three steps to (+/-)-hyphodermin A, via the key step of epoxidation of an enone in the presence of a THP lactol. A combination of NMR and ab initio studies suggests that the structures of hyphodermin C and D should be interchanged.     

3-硝基邻苯二甲腈的合成

以邻苯二甲酸酐为原料,经过硝化、脱水、亚胺化、氨解、脱水5步反应,高产率地合成了3-硝基邻苯二甲腈,研究了邻苯二甲酸酐的硝化反应、3-硝基邻苯二甲酰胺的脱水条件对产率的影响。目标化合物的结构用元素分析,IR和^1H NMR表征。     

立体选择性合成内型N-Boc-N-去甲托品醇

以托品酮为起始原料,与氯甲酸氯乙酯经脱甲基化反应制得脱甲基托品酮（1）; 1与Boc酸酐反应制得N-Boc-N-去甲托品酮（2）;以三仲丁基硼氢化锂为还原剂,2经还原反应立体选择性合成了内型N-Boc-N-去甲托品醇（内型/外型=6.5/1）,总收率60%,其结构经¹H NMR和ESI-MS确证。     

固体酸SO_4~(2-)/ZrO_2-MoO_3催化合成富马酸二甲酯

在固体酸SO2-4/ZrO2 MoO3催化下,由马来酸酐和甲醇催化合成了富马酸二甲酯.探讨了催化剂用量,原料配比,反应时间对产率的影响.最佳反应条件为:醇酸摩尔比为6∶1,反应时间3h,催化剂占反应物总质量的1.5%,产物收率在93%以上.     

Lipozyme TL IM催化合成Temsirolimus

在脂肪酶Lipozyme TL IM的催化下,2,2,5-三甲基-1,3-二氧六环-5-羧酸酐对抗生素西罗莫司的42-位羟基进行区域选择性酯化制得化合物4;4水解后合成了西罗莫司脂化物Temsirolimus,总产率83.7%。其结构经1H NMR和HR-MS确证。     

(5-氨基-[1,3,4]噻二唑-2-基)-丙酸乙酯的合成工艺改进

以丁二酸酐为起始原料,经醇解和酰化反应制得丁二酸单乙酯酰氯(3);3经甲烷磺酸催化与氨基硫脲环合合成了重要药物中间体——(5-氨基-[1,3,4]噻二唑-2-基)-丙酸乙酯,其结构经~1H NMR,IR和MS确证。运用正交试验对环合反应条件进行优化。最优反应条件为:3 132 mmol,n(氨基硫脲)∶n(3)∶n(甲烷磺酸)=1∶3∶3,于110℃反应3 h,总收率51.3%。     

Facile synthesis of reactive benzoazetinone by flash vacuum pyrolysis of isatoic anhydride

Pyrolysis of isatoic anhydride (3) at 550°C and ca. 1×10⁻² torr gave benzoazetinone (1, 80%) as the only product. The existence of 1 was confirmed by low-temperature NMR spectroscopy at −90°C. Above −20°C, 1 was converted to dimer (4, 50%), trimer (5, 22%), and anthranilic acid (6, 12%). Pyrolysis of 3 at 800°C and ca. 1×10⁻² torr gave 1-cyanocyclopentadiene (7) in 38% yield.     

Synthesis of caulersin and its isomers by reaction of indole-2,3-dicarboxylic anhydrides with methyl indoleacetates

1-Benzenesulfonylindole-2,3-dicarboxylic anhydride was reacted with methyl 1-benzenesulfonylindole-2-acetate to give the corresponding 2-acylindole-3-carboxylic acid as the sole product in high yield, which could be converted to caulersin in four steps. In a similar manner, three isomers A, B, and C were synthesized by reaction of indole-2,3-dicarboxylic anhydrides with methyl indoleacetates.     

吡啶联喹唑啉酮衍生物的设计、合成与抗菌活性研究

以靛红酸酐为起始原料,设计并合成了14个结构新颖的吡啶联喹唑啉酮类衍生物。所有化合物经1H NMR、13 C NMR和高分辨质谱(HRMS)表征确证其结构。初步抗菌活性结果显示,该类化合物对水稻白叶枯病菌(Xanthomonas oryzae pv.Oryzae,Xoo)、猕猴桃溃疡病菌(Pseudomonassyringae pv.actinidae,Psa)和玉米纹枯病菌(Rhizoctonia solani,Rs)均表现出一定的抑制活性。其中化合物2-([3,3′-联吡啶]-5-基)-6-氯-3,8-二甲基喹唑啉-4(3 H)-酮(3m)对Rs的抑制活性可达(51.8%)。     

4-氧代-β-紫罗兰酮合成方法的改进

对Kaiser报道的以α-紫罗兰酮为原料合成4-氧代-β-紫罗兰酮的方法进行了改进,研究了影响环氧化、开环和氧化的主要因素,探讨了分离纯化方法,其结构经MS、IR、1H-NMR、13C-NMR和元素分析进行了表征。磷钨酸可有效的催化过氧化氢氧化α-紫罗兰酮合成4,5-环氧-α-紫罗兰酮,当磷钨酸/过氧化氢摩尔比为5:100时,收率为85%;4,5-环氧-α-紫罗兰酮在甲醇钠催化下反应生成羟基紫罗兰酮,收率94％,纯度85％;经琥珀酸酐纯化,收率83％,纯度96％;再经异丙醇铝氧化、柱层析分离,4-氧代-β-紫罗兰酮的收率为93%,反应总收率从47.2%提高至61.7％。     

一锅法合成3-溴丙基乙酸酯

以1，3-丙二醇、氢溴酸（48％）和冰醋酸为原料，在带水剂的作用下，一锅法合成了3-溴丙基乙酸酯．考察了带水剂及追加醋酸或醋酸酐量对产率的影响，并通过气质联用仪对粗产品进行分析测定，推断其反应机理．结果表明：较适宜的合成条件为1，3-丙二醇0．21mol，1，3-丙二醇与氢溴酸（48％）、冰醋酸摩尔比为1：1：1．3，在带水剂甲苯（21mL）的作用下，反应2．5h，反应结束前1h追加4．8mL醋酸酐，合成效果最好，产率可达到95．7％．     

A novel methyl migration to the phosphoryl group with the formation of cyclic aminoacylphosphoramidates in electrospray ionization tandem mass spectra of amino acid ester phosphoramidates of antiviral nucleosides

The mass spectral behavior of amino acid methyl ester phosphoramidate derivatives have been investigated using electrospray ionization multistage mass spectrometry (ESI-MS(n)) and moderate theoretical calculations at the B3LYP/6-31G(d) level. A novel methyl group migration to the phosphoryl group with the formation of the intermediate cyclic aminoacylphosphoramidate was found. The proposed structures of the rearrangement ions were confirmed by high-resolution tandem mass spectrometry. A possible mechanism involving the pentacoordinate phosphoric-carboxylic phosphate anhydride was proposed, in which the metal ion coordination with the phosphoryl and carbonyl groups and the intrinsic properties of phosphoryl group might be the key factors responsible for this novel migration.     

3-羟基-4-氯-1,8-萘酐的分子设计及免溶剂微波法合成

1,8-萘酐衍生物具有优良的光电性能(固相荧光量子产率高和光热稳定性好)[1-2],它们不仅是一类性能优异的红光和绿光材料[3-5],而且还可以用作电子传输材料.     

一种新的离子液体负载的双(三氟乙酰氧基)碘苯试剂的合成

以氯乙酰氯和对碘苯胺为原料,经酰化合成了4-碘-氯乙酰苯胺,接着与1-甲基咪唑反应得到氯化1-甲基-3-(4-碘苯氨基甲酰甲基)咪唑钅翁,随后在水溶液中发生阴离子交换,合成了1-甲基-3-(4-碘苯氨基甲酰甲基)咪唑四氟硼酸盐;四氟硼酸盐在过氧化氢/三氟乙酸酐体系中氧化得到一种新的离子液体负载的双(三氟乙酰氧基)碘苯试剂1-甲基-3-[4-双(三氟乙酰氧基)碘苯氨基甲酰甲基]咪唑四氟硼酸盐。反应总收率62.3%。试剂没有吸湿性,在空气中长期放置不变质。化学结构用IR、1H NMR、13C NMR、19F NMR和元素分析表征。     

Intramolecular amidofuran cycloadditions across an indole pi-bond: an efficient approach to the aspidosperma and strychnos ABCE core

[reaction: see text] The intramolecular Diels-Alder reaction between an amidofuran moiety tethered onto an indole component was examined as a strategy for the synthesis of Aspidosperma and Strychnos alkaloids. Furanyl carbamate 13 was acylated using the mixed anhydride 16 to provide amidofuran 12 in 68% yield. Further N-acylation of this indole furnished 17 in 88% yield. Cyclization precursors were prepared by removing the carbamate moiety followed by N-alkylation with the appropriate alkyl halides. Thermolysis of 25 provided the novel tetracyclic ketone 26 in 74% yield.     

应用烯基铜锂试剂合成消旋日本丽金龟性信息素

应用烯基铜锂试剂合成消旋日本丽金龟性信息素徐章煌，黄锦霞，李焰，潘贻罕，蒋济隆，赵建洪（湖北大学化学系武汉４３００６２）（华中理工大学固态电子学系武汉）关键词日本丽金龟，性信息素，烯基铜日本丽金龟成虫对多种树木、观赏植物及农作物危害极大，１９７６年，...     

氟喹酮的合成工艺改进

以靛红酸酐为起始原料,经硝化、还原上保护、氨解开环、环合、卤素交换和脱保护共七步反应合成了氟喹酮（7）,其结构经 ¹H NMR,¹³C NMR和ESI-MS确证。研究了硝化试剂、溶剂、催化剂等对7收率的影响,结果表明：在使用浓硝酸作为硝化试剂,甲苯,乙腈等为溶剂,Raney-Ni, TBAB等为催化剂时,总收率可达58%,纯度达99%以上。     

Convenient synthesis of 5-trifluoroacetylated imidazoles by ring transformation of mesoionic 1,3-oxazolium-5-olates

Mesoionic 4-trifluoroacetyl-1,3-oxazolium-5-olates (1), obtained from the reaction of N-acyl-N-alkylglycines (2) with trifluoroacetic anhydride, react with amidines to give 5-trifluoroacetylimidazoles (3) in moderate yield. The novel ring transformations of 1 into 3 occur via an initial attack of amidines on the C-2 position of the ring.