微波辐射下苯并噁唑基吡啶的合成

在微波辐射条件下,利用邻氨基酚和吡啶羧酸在多聚磷酸中的缩合反应,合成了2种苯并唑基取代吡啶 最佳反应条件为:450W辐射4min 相比于常规反应,反应时间大为缩短且产率令人满意     

微波辐射下2-芳基取代苯并噁唑的合成

邻氨基酚和芳香羧酸在微波辐射条件下缩合,合成了4种2-芳基取代苯并噁唑化合物。优化反应条件为：多聚磷酸为催化剂,辐射功率500W,辐射时间4min。     

新型苯并噁唑(噻唑)衍生物的合成与表征

通过N-氯乙酰或N、N＇-二氯乙酰取代的含氮杂环中间体，4，5-二氯-2-苯基-3-哒嗪酮分别与2-巯基苯并噁唑和2-巯基苯并噻唑反应，合成了8个未见文献报道的苯并噁唑和苯并噻唑衍生物，其结构经^1H NMR，IR，MS及元素分析确认。     

新型苯并噁唑基吡啶盐的合成及其线性光学性质

以邻氨基苯酚和对甲基苯甲酸为原料,多聚磷酸为溶剂,N₂保护下于220 ℃反应制得中间体L1; L1溴代得中间体L2; L2与三苯基膦反应得膦盐L3,L3与吡啶-3-甲醛通过Wittig反应制得中间体L4,再通过甲基化反应和阴离子置换合成了未见报导的化合物1~6,并利用¹H NMR, ¹³C NMR, FT-IR和HR-MS对化合物1~6的结构进行了表征。单晶结构测试表明:化合物1(CCDC: 1838541)的阳离子部分的平面性较好。紫外可见吸收光谱和荧光发射光谱结果表明：化合物1~6在不同极性溶剂中均具有良好的光学性质。     

苯并双噁唑类聚合物的合成

详细介绍了以4,6-二氨基间苯二酚盐酸盐(DADHB)为原料,采用多聚磷酸法、三甲基硅烷基化法、中间相聚合法、单体成盐法合成聚对苯撑苯并双噁唑(PBO),还有以4,6-二硝基间苯二酚(DNR)为原料,先选择还原制得4-氨基-6-硝基间苯二酚盐酸盐,进而与对甲氧羰基苯甲酰氯进行缩环合获得苯并噁唑化合物,再催化加氢合成AB型PBO新单体2-(对甲氧羰基苯基)-5-氨基-6-羟基苯并噁唑,最后自缩聚反应制备PBO的新路线.另外,本文还介绍了直链烯烃型、直链脂肪烷烃型、稠环芳烃型、联苯取代基型、杂环型、聚醚型等苯并双噁唑类聚合物的合成方法.     

新型苯并噁唑侧基聚酰亚胺的合成、结构与性能研究

为了改善聚酰亚胺的不溶不熔性, 一类可溶性苯并噁唑侧基聚酰亚胺树脂被成功制备. 从合成的新型二元胺单体出发, 制备了侧链为邻羟基苯胺酰胺结构的聚酰亚胺体系, 进一步催化环化邻羟基苯胺酰胺为苯并噁唑结构, 并对这两类不同结构的聚合物树脂进行了红外光谱的结构表征, 以及最终成膜的力学性能和耐热性能测试. 研究结果表明: 苯并噁唑侧基聚酰亚胺的力学性能优于相应的主链型聚酰亚胺, 且TGA分析表明, 其初始分解温度高达597 ℃, 有望用于航空航天方面高强、高模、耐高温的结构材料.     

2-取代苯并噁唑衍生物的合成及生物活性

疏基苯并噁唑;2-取代苯并噁唑衍生物的合成及生物活性     

主链含有苯并噁唑环的PPV型齐聚物的合成

以-甲基-2-氯甲基苯并(口恶)唑和对二苯甲醛为主要原料,通过两次Wittig-Horner反应,合成了未见文献报道的主链含有苯并-NFDA1-唑环的PPV型齐聚物.目的在于在PPV聚合物主链中嵌入电子传输型结构单元,提高聚对苯撑乙烯共轭链的电子传输能力,改变PPV的发光特性.分析数据表明,该齐聚物的M_w为2500,并且分子结构中的乙烯基 C＝C 双键均为反式结构特征.UV-Vis吸收光谱特征峰λ_max等于497 nm.     

含苯并噁唑的L-酪氨酸衍生物的合成

从L-酪氨酸乙酯出发,经氨基保护、硝化、还原反应制得3-氨基-L-酪氨酸乙酯(4);4与苯甲醛或取代苯甲醛完成环化反应,合成了6个新的含苯并噁唑的L-酪氨酸衍生物,其结构经1H NMR,13C NMR,IR和元素分析表征.     

微波辐射下的芳基甲酰氨基硫脲的合成

本文报道了以水为介质, 在微波辐射下的芳基甲酰氨基硫脲的合成。该法反应快, 产率高。     

微波辐射催化合成肉桂酸苄酯

肉桂酸苄酯是一种具有弱苏合香、花香等香气的香料,主要用于配制龙蜒香,在东方型香脂中作为定香剂,也可用作皂用、化妆用及果实香精的调香配料。肉桂酸苄酯的合成,在工业上,主要采用肉桂酸钠与氯化苄在二乙胺作用下反应,反应时间长达17h,产率80％以上。近年来的研究     

Synthesis of diethers derived from furoin by phase transfer catalysis under microwave irradiation

A series of new diethers were obtained by alkylation of furoin under microwave irradiation (MWI) in phase transfer catalysis (PTC) conditions. The products of alkyl halides were synthesized in good yields (>75%) within a few minutes, and the products of dihalides were synthesized in fair yields (about 45%). The yields are dramatically improved compared to conventional heating under the same conditions, in spite of similar profiles of rising in temperature.     

Fast preparation of dihydrocyclocitral from citronellal under solventless microwave irradiation

Dihydrocyclocitral, a useful reagent in organic synthesis, has been synthesized in high yield and with high stereoselectivity from citronellal under microwave irradiation in two steps, involving acetic anhydride under base catalysis, then p-toluenesulfonic acid adsorbed on silica gel under solventless conditions (80% yield, reaction time 22 min).     

Traceless synthesis of hydantoin by focused microwave irradiation

An efficient, microwave-assisted method for the liquid-phase combinatorial synthesis of 1,3-disubstituted hydantoin has been developed. Chloroacetyl chloride was directly anchored to HO-PEG-OH and subsequently reacted with various primary amines in a microwave cavity. The PEG bound secondary amine coupled with isocyanates and concomitant cyclization-cleavage step occurred in mild basic conditions by microwave flash heating. The desired products were then liberated from the soluble matrix in modest yield and high purity.     

微波合成水杨酸异丙酯

研究了微波合成水杨酸异丙酯的工艺，与常规方法相对比，发现利用微波合成 水杨酸异丙酯具有反应速度快、转化率高、杂质含量小、后处理简单、无三废排放 等优点。     

Synthesis of 1,4-diazepin-5-ones under microwave irradiation and their reduction products

A new efficient access to 1,4-diazepane derivatives is described via a microwave assisted synthesis of 7-substituted-1,4-diazepin-5-ones, which proceeds rapidly in good yields. Catalytic reduction gave 1,4-diazepan-5-ones and 1,4-diazepanes whereas a ring opening was observed by hydride reduction when a phenyl group occupies the N-benzylic position.     

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。     

Synthesis of azo-incorporated copolymers by C1/N2C1 copolymerization under microwave irradiation

Catalyst-free copolymerization of ethyl diazoacetate(EDA) with carbethoxycarbene(CEC) has been achieved through two approaches:microwave irradiation and enzyme-assisted(Novozyme-435)system.The structure of the copolymer was characterized by MALDI-TOF MS(m/z from 2000 to 2450),which suggested that the main chain of the copolymer consisted of-CH(COOEt)- and-N=NCH(COOEt)- frameworks.Fourier transform infrared(FT1R) spectrometry,elemental analysis,and Raman spectrometry proved the incorporation of azo group in the copolymer.The results indicated that the CEC radicals were generated under microwave irradiation(with or without Novozyme-435) from EDA.The mechanism study described that the generation speed of CEC radical was faster than its polymerization,and the excess CEC radicals improved the activity of the N2C1 group,thus inducing some EDA molecules as radicals.The two kinds of radicals co-coupled to result in poIy(CEC-co-EDA) through the C1/N2C1 copolymerization,but the homopolymerization of CEC radical occurred quicker than its cocoupling with activated EDA.     

Formation of monodispersed PVP-capped ZnS and CdS nanocrystals under microwave irradiation

Poly (N-vinyl-2-pyrrolidone) (PVP)-capped ZnS, CdS nanoparticles were prepared by a microwave method from Zn(Ac)₂ or Cd(Ac)₂ and thiourea in N,N-dimethylformamide (DMF) solution. The reaction process was monitored by the temporal evolution of the absorption spectrum. With PVP as stabilizer, monodispersed semiconductor nanoparticles, which showed high quantum size effect, have been obtained. Further study showed that the microwave irradiation could influence selectively the nucleation and growing rates of different semiconductor nanoparticles.