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光学活性螺-环丙烷双内酯化合物的合成 总被引:3,自引:0,他引:3
描述了5-(l-孟氧基)-3-溴-2(5H)-呋喃酮新手性试剂1与氮亲核试剂发生的串联不对称双Michael加成/分子内亲核取代反应,一举生成4个新手性中心。报道了含有叔胺官能团的螺-环丙烷双内酯化合物4a-4d的合成方法以及结构测定。 相似文献
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有机锗化合物的合成及其生物活性 总被引:3,自引:0,他引:3
讨论了有机锗化合物在国内外的进展。按制备方法分类,重点介绍了烃基锗化合物、螺锗及其衍生物、有机锗倍半氧化物、有机锗倍半硫化物、介吗川类有机锗化合笔挺人有生物活性的化合物。 相似文献
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手性螺-环丙烷双内酯化合物的合成与结构 总被引:3,自引:0,他引:3
本文进一步研究了5-(l-孟氧基)-3-溴-2(5H)-呋喃酮(1)与氧的亲核试剂,如二苯甲醇、苯甲醇、α-甲基苯甲醇、薄荷醇、冰片醇发生新颖的串联不对称双Michael加成/分子内亲核取代反应,合成了一般方法难以合成的含有多个手性中心的螺[1-溴-4-l-孟氧基-5-氧杂-6-氧代双环[3.1.0]己烷-2,3'-(4'-亲核基-5'-孟氧基丁内酯)](4a-4e)。通过元素分析,IR,UV,^1HNMR,^1^3CNMR,MS,[α]~D^2^0波谱分析数据以及X四圆衍射确定了4a-4e的化学结构和绝对构型。 相似文献
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利用环己二酮单腙芳构化反应, 得到9H, 9H, 11H, 11H, 12H, 12H-六氢化苯并[9,10]-(1H, 1H, 3H, 3H, 4H, 4H, 5H, 5H, 7H, 7H, 8H, 8H-十二氢)菲-2, 6, 10-三酮腙, 然后与季戊四醇反应, 得到9H, 9H, 11H, 11H, 12H, 12H-六氢化苯并[9,10]-(1H, 1H, 3H, 3H, 4H, 4H, 5H,5H, 7H, 7H, 8H, 8H-十二氢)菲-2,6,10-三酮缩三(2,2-二羟甲基-1,3-丙二醇), 再与9-[4-(2,6-二硫杂环己基)苯基]-3-[4-(二甲酯基甲基)苯基]-2,4,8,10-四氧杂螺[5.5]十一烷反应, 制成标题化合物. 中间体和标题化合物经过IR, 1H NMR, MS和元素分析表征. 相似文献
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设计合成了几种新型螺吡喃化合物(SP), 采用1H NMR, IR 和MS 对其结构进行表征. 研究了目标产物的光致变色性能及其影响因素, 并对SP1 在高分子材料领域的应用作了初步研究. 结果表明: 苯并吡喃环连有强吸电子基时, 最大吸收峰红移; 1 位N原子上连有柔性长链基团时, 热褪色速率较慢; 采用紫外光照射目标产物不同时间, SP1 表现出较好的抗光疲劳性. 分别以SP1 为接枝组分和共混组分制备两种高分子材料SP-g-hPMMA 和SP-m-PMMA, 通过紫外光辐照动力学研究表明, SP-g-hPMMA 和SP-m-PMMA 均表现出比SP1 优异的光致变色性能, 且不影响PMMA 的机械性能. SP1 有望用于高分子光致变色材料领域. 相似文献
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按两种不同的结构类型(中性分子型和离子型)着重对五配位锗化合物的结构特点、研究进展等方面的内容进行了综述。 相似文献
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对于多螺环化合物特别是第二代稠杂螺环树枝状化合物来说,按照IUPAC有关系统命名原则,从螺结构的角度来命名由于太复杂而几乎不可能.本文通过亚基取代途径对第一代螺环结构的简化,方便地系统命名了一种第二代稠杂螺环树枝状化合物.这些六螺化合物可以系统地命名为:1,2,3,4,5,6,7,8,9,10,11,12-十二氢化-2,2:6,6:10,10-三[3,3-二(烷氧羰基)亚环丁-1,1-二甲氧基]苯并[l]菲.通过这一途径,更高代螺环树枝状化合物及其它类型多螺化合物有望可以简单地系统命名. 相似文献
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A novel lactone derived from dehydroabietic acid,C20H21BrO4,has been charac-terized by IR,1H NMR,13C NMR and single-crystal X-ray diffraction method.It crystallizes in orthorhombic,space group P212121 with a = 6.4195(15),b = 11.535(3),c = 24.654(6) ,V = 1825.5(7) 3,Z = 4,Mr = 405.28,Dc = 1.475 g/cm3,λ = 0.71075 ,μ(MoKα) = 2.27 mm-1,F(000) = 832,the final R = 0.024 and wR = 0.045 for 2152 observed reflections with I 2σ(I).The molecules of lactone are mainly linked through intermolecular hydrogen bonds. 相似文献
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Tetrabromo-p-benzoquinone reacted with excess aromatic amines to give 2,5-dirylamino-3,6-dibromo-p-benzoquinones. The latter molecules on heating with sodium sulfide in alcohol in the presence of air gave triphenodithiazinediones.
Heating with copper powder in nitrobenzene transformed these compounds into the respective indolocarbazolediones. Comparative
antimicrobial and antifungal activities of the studied compounds were determined and discussed. 相似文献
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PseudolaricacidAwasisolatedfromPseudolariXkaempferiGord,aChinesemedicinalherbwhichexhibitsantifungalandantifertilityactivities'.Itisaditerpenicacidwithatransfusedhydroazuleneskeletoncontainingfourchiralcenters'.Accordingtotheretrosyntheticanalysis,thetricyclisskeletonofIcouldbeconstructedbyastereoselectiveintramolecular[4 3]cycloadditionfromaseven-memberedlactone4(Schemel).Inthiscommunication,wewouldliketoreportanefficient,stereo-andregio-selective,synthesisoflactone4.Thesynthesisbeganwitht… 相似文献
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Synthesis of 15-demethyl brefeldin A and its 7-epimer is detailed. X-ray crystallographic structure for 15-demethyl brefeldin A is also disclosed. 相似文献
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Ahmed S. Hammam Mohamed S. K. Youssef Ferial M. Atta Thana A. Mohamed 《Chemical Papers》2008,62(2):194-206
The reaction of two equivalents of sodium azide with diarylaminodibromo-p-benzoquinone (I) in DMF for 15–24 h produced quinoxalinophenazinediones together with a byproduct identified as diarylaminodiaminobenzoquinone.
On the other hand, the reaction of bromanil with active methylenes, such as diethyl malonate and ethyl acetoacetate, resulted
in disubstitution products which, on treatment with primary amines, cyclized into benzodipyrroletetrones. Comparative antifungal
and antibacterial studies were made. 相似文献
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Tai-Ming Shao Cai-Juan Zheng Xiao-Bao Li Guang-Ying Chen 《Natural product research》2018,32(19):2268-2273
A new lactone ficusine D (1), together with six known compounds (2–7) were isolated from the stems of the Ficus auriculata. The new compound 1 was a rare 12-membered lactone containing a quinone ring skeleton. The structure of the 1 was elucidated by comprehensive spectroscopic data. The relative and absolute configurations of 1 were elucidated by the ROESY analysis and biogenesis pathway. All compounds were evaluated for their antibacterial activities against six pathogenic bacteria in vitro. Compounds 6 and 7 exhibited potent antibacterial activities against Bacillus cereus with the MIC values of 2.5 and 5 μM, respectively. 相似文献