胸腺嘧啶核苷与过渡金属配位稳定常数的测定

本文采用pH滴定法准确测定了胸腺嘧啶核苷与几种过渡金属离子的配位数和逐级稳定常数，并对其配位作用规律进行了讨论。     

微波辐射下8-取代嘌呤核苷的绿色合成

8-溴嘌呤核苷与亲核试剂在水溶液中,于400W,95℃微波辐射5min合成了10种8-取代嘌呤核苷,收率72%～92%,其结构经1HNMR和13CNMR表征。     

硫代核苷类似物合成研究进展

4′-硫代核苷类似物是核糖环中的氧原子被硫原子取代的核苷类似物。许多硫代核苷具有良好的抗病毒和抗肿瘤活性。4′-硫代核苷具有更稳定的糖基键和针对各种病毒或细胞酶的代谢稳定性的提升等固有优点。因此,对硫代核苷类似物的设计与合成,筛选出安全有效的抗病毒试剂应受到更多药物化学家们的关注,本文综述了近年来硫代核苷的合成研究进展。     

5-卤代-2’-脱氧-2’-β-氟-4’-叠氮嘧啶核苷的合成与抗乙肝病毒活性研究

以(间氯)苯甲酰基保护的2’-脱氧-2’-β-氟-4’-叠氮尿苷为起始原料,经过硝酸铈铵(CAN)介导的卤代、三氮唑活化、胺化、脱保护合成了一系列5-卤代的2’-脱氧-2’-β-氟-4’-叠氮嘧啶核苷类化合物.体外生物活性评价研究表明, 5-氯代(6a)和5-碘代(6c)核苷衍生物具有很好的抗乙肝病毒活性,而且细胞毒性较小.     

微波辐射下浓硫酸催化嘧啶酮的无溶剂合成

微波辐射下,以浓硫酸为催化剂,芳香醛、尿素和乙酰乙酸乙酯为原料,无溶剂下发生B iginelli缩合反应,高产率地合成了10个3,4二-氢嘧啶-2酮-衍生物。该方法不仅反应条件温和,反应时间短,避免使用昂贵的催化剂,后处理过程简单,而且避免了使用溶剂给环境带来的污染,具有绿色合成的特点。     

2-哌嗪基-4-苯基嘧啶衍生物的合成研究

以苯乙酮和苯胺衍生物为起始原料,通过缩合、环合、氯代反应,得到3种4-苯基-2-氯嘧啶衍生物,进而与苯基哌嗪盐酸盐反应,合成了12种带有不同取代基的2-哌嗪基-4-苯基嘧啶衍生物。该合成方法具有反应时间短、操作简便、副产物少的优点。各步产物均用MS,1H NMR,13C NMR表征。     

5′-0-三苯甲基核苷衍生物的微波合成

以DMF为溶剂,二甲氨基吡啶为碱,微波辐射下核苷衍生物与三苯甲基氯反应合成了8种选择性羟基保护的5′-O-三苯甲基核苷衍生物,收率67%～87%,其结构经1H NMR和元素分析表征.     

微波辐射合成4,4′,4″-三硝基三苯胺

以对硝基苯胺(1)和4-氯硝基苯(2)为原料,二甲基亚砜为溶剂,叔丁醇钾为缚酸剂,氟化钾和四甲基氯化铵为催化剂,在微波辐射下合成了4,4′,4″-三硝基三苯胺(3),其结构经IR表征.正交实验确定最佳反应条件为:13 mmol,n(1)∶n(2)∶n(叔丁醇钾)=1∶3∶2,在125 W下,于130℃反应30 min,3的收率达98.2%.     

微波辐射下合成芳香硫醚

本文对在微波条件下S－烃基化反应进行了研究，并提供一种硫酚和卤代烃在氧化铝作载体的条件下，不用任何有机溶剂经微波辐射简便、快速、有效合成芳香硫醚的方法。     

微波辐射下水中6-氯嘌呤(核苷)及8-溴嘌呤核苷的脱卤反应

以6-氯嘌呤,6-氯嘌呤核苷或8-溴嘌呤核苷为原料,微波辐射下与水合肼反应生成相应的6-肼嘌呤(2a～2e),6-肼嘌呤核苷(2f和2g)或8-肼嘌呤核苷(2h和2i);2在微波辐射下经Wolff-Kishner-HuangMinlon还原反应得到6-脱氯嘌呤,6-脱氯嘌呤核苷或8-脱溴嘌呤核苷,总收率46%～83%,其结构经1HNMR和13CNMR表征。     

Solvent-free synthesis of 2-amino-4-arylthiazoles under microwave irradiation

2-Amino-4-arylthiazoles were prepared in a one-pot solvent-free procedure by reaction of p-substituted acetophenones with thiourea and iodine under microwave irradiation.     

微波辐射下有效合成缩氨基硫脲类化合物

将肼基二硫代甲酸甲酯与相应的醛或酮在微波辐射下,经2~3.5m in反应得到化合物3-二取代甲(乙)撑肼基二硫代甲酸甲酯1,收率90~96%,然后将化合物1与胺在微波辐射下,经35~45m in反应得到目标化合物2~4,收率68~90%。微波辐射法比常规法显著的缩短了反应时间,提高了收率。共计合成目标化合物19个。以上化合物均经过熔点测定、质谱、红外光谱、核磁共振氢谱对其结构进行确证。     

One-pot synthesis of 5-arylidene-2-imino-4-thiazolidinones under microwave irradiation

A rapid and easy solvent free one-pot synthesis of 5-arylidene-2-imino-4-thiazolidinones by condensation of the thioureas with chloroacetic acid and an aldehyde under microwave-irradiation is described.     

Facile and efficient synthesis of quinoline-4-carboxylic acids under microwave irradiation

<正>A facile and efficient method for the preparation of 2-non-substituted quinoline-4-carboxylic acids is described via the Pfitzinger reaction of isatins with sodium pyruvate following consequent decarboxylation under microwave irradiation.     

Direct synthesis of unprotected 4-aryl phenylalanines via the Suzuki reaction under microwave irradiation

[formula: see text] 4-Aryl phenylalanines were prepared as free amino acids from the Suzuki coupling of 4-borono phenylalanine with aryl halides in high yields within 5-10 min under microwave irradiation.     

Solvent-free synthesis of functionalized flavones under microwave irradiation

[reaction: see text] Eco-friendly direct solvent-free synthesis of flavones is achieved by microwave irradiation of phloroglucinol and beta-ketoesters. Heating with microwaves versus under classical conditions was shown to be higher yielding, cleaner, and faster. The reaction goes through a cycloaddition of an alpha-oxo ketene intermediate followed by an uncatalyzed thermal Fries rearrangement.     

N-芳基吡咯烷的微波水相简便合成

微波辐射下,以芳胺和1,4-丁二醇二甲磺酸酯为起始原料,在碳酸钾水溶液中发生环缩合反应,一步生成Ⅳ-芳基吡咯烷(产率11.4%-83.6%).该反应在常压条件下进行,产品用萃取方法纯化,该工艺具有操作安全,反应条件温和,后处理简便等优点.     

An improved synthesis of alpha-carbolines under microwave irradiation

[reaction: see text]. Alpha-carbolines are interesting core structures for designing DNA-interacting small molecules. However, these compounds are not commercially available and their synthetic methods are low yielding or time consuming. The shortest synthetic route, the modified Graebe-Ullmann reaction, has been optimized by using microwave heating in four different types of apparatus to give shorter reaction times and enhanced yields. Optimized conditions enabled the preparation of a small library of alpha-carbolines.     

微波辐射固相合成4-三氟甲基-7-羟基-6-氯香豆素

分别以无水氯化锌、对甲苯磺酸为催化剂,采用微波辐射法,在无溶剂条件下由4-氯间苯二酚与三氟乙酰乙酸乙酯缩合制备标题化合物;优化了反应条件.结果表明,在微波辐射下,无水氯化锌对该反应有较好的催化活性,相应的4-三氟甲基-7-羟基-6-氯香豆素的产率可达73.0%.优化的反应条件为:4-氯间苯二酚、三氟乙酰乙酸乙酯和无水ZnCl2的摩尔比为1∶1.1∶0.9,微波辐射功率800W,辐射时间20min,反应温度85℃.     

Efficient synthesis of multi-substituted oxazoles under solvent-free microwave irradiation

A new and efficient method for the synthesis of multi-substituted oxazoles from various carbonyl compounds has been developed using sequential treatment of carbonyl compounds with HDNIB and amides such as acetamide or benzamide under solvent-free microwave irradiation conditions.