α-重氮膦酸酯研究进展

重氮化合物作为一类重要的卡宾前体,可以在过渡金属催化下发生X—H(X=C,N,O,S,Si等)插入反应、1,2-氢迁移反应、环丙烷化反应等一系列化学转换,为构建各种药物分子、天然产物以及生物活性分子提供了有效的手段.α-重氮膦酸酯作为一类重要的重氮化合物,同样可以通过化学转化构建各种含磷功能化合物.由于有机磷化合物具有广泛的生物和药物活性,所以研究α-重氮膦酸酯的合成及相关反应性质具有重要的意义,综述了近年来α-重氮膦酸酯的研究进展和应用.     

α-重氮膦酸酯作为亲核试剂参与不对称反应的研究进展

重氮化合物作为一类重要的合成子,在有机合成、药物化学、材料化学及化学生物学等领域均有广泛应用。α-重氮膦酸酯作为α-重氮羧酸酯的电子等排物,可作为亲核试剂参与不对称反应。综述了α-重氮膦酸酯作为亲核试剂参与不对称反应（Mannich反应,Morita Baylis-Hillman反应,类Aldol反应以及［3+2］反应）的研究进展,并对其未来发展进行了展望。     

铑(Ⅱ)催化重氮苄基膦酸酯与芳香亚胺的氮杂环丙烷化反应

铑(Ⅱ)催化重氮苄基膦酸酯与芳香亚胺反应,一步合成氮杂环丙烷-2-膦酸酯．该方法立体定向地得到唯一的反式构型产物,反应历程是重氮化合物先与亚胺形成叶立德中间体,然后发生自身环丙烷化反应．     

铑(II)催化重氮苄基膦酸酯与芳香亚胺的氮杂环丙烷化反应

铑(II)催化重氮苄基膦酸酯与芳香亚胺反应, 一步合成氮杂环丙烷-2-膦酸酯. 该方法立体定向地得到唯一的反式构型产物, 反应历程是重氮化合物先与亚胺形成叶立德中间体, 然后发生自身环丙烷化反应.     

高立体选择性合成环氧乙烷-2-膦酸酯的研究

利用铑(Ⅱ)催化重氮苄基膦酸酯与芳香醛或酮化学专一地进行环氧化反应,高产率、高立体选择性地合成了顺式环氧乙烷-2-膦酸酯.反应历程是重氮化合物先与醛或酮形成羰基叶立德中间体,然后发生自身环化反应.产物经红外光谱、1H核磁共振谱、质谱和X射线衍射确定结构.     

α-羟基取代膦酸酯类化合物的合成研究进展

含磷化合物一直是有机化学研究的热点之一,许多合成药物以及天然产物都含有磷原子。其中,α-羟基取代膦酸酯类化合物是重要的有机合成中间体,其在有机合成中的应用一直受到广泛关注。文章详细综述了α-羟基取代膦酸酯类化合物的合成方法。     

重氮化合物参与的连续流动反应

重氮化合物是一种用途广泛的有机砌块,能够作为1,3-偶极子、亲核试剂以及卡宾前体参与到各种有机分子的构建之中.但重氮化合物潜在的毒性、不稳定性以及爆炸风险限制了它的应用潜力.连续流动技术在这一领域的应用能够有效保证反应的安全性,并为重氮化合物的大批量应用提供了可能.按照重氮化合物的种类分类,系统地归纳了近年来连续流动技术在重氮化合物参与的各种转化中的应用.     

钯催化重氮化合物反应的研究进展

重氮化合物在过渡金属催化剂作用下的分解以及后续反应在有机合成上得到了非常广泛的应用. 综述了近年来钯催化重氮化合物反应的研究进展, 主要包括环丙烷化反应、聚合反应、插入反应、交叉偶联反应及其机理的探讨.     

含磷二肽的合成及其除草活性的研究(Ⅱ)

用α-氨基甲基膦酸酯分别与N-氟乙酰基氨基酸酯和N-氯乙酰基胸酸酯进行亲核取代反应,合成了如下通式的新型含磷二肽,生物活性测定发现有的化合物具有较好的除草活性.     

磷硅试剂 - 三烷基硅基亚磷酸酯及磷酸酯的合成研究

1944年,Sauer用六甲基二硅氧烷与五氧化二磷反应,首次获得了分子中含有磷原子和硅原子的化合物(Me_jSiO)_3PO。六十年代初期,Canavan通过对一系列硅氧基烃基膦酸酯的热分解反应进行研究,发现引入含磷有机基     

Synthesis of α-aryl-diazophosphonates via palladium-catalyzed cross-coupling of aryl iodides with diethyl diazomethylphosphonate

An efficient procedure for the Pd-catalyzed arylation of diethyl α-diazomethylphosphonate with aryl iodides is described. It can serve as a pathway for the generation of arylated diazophosphonates, which are typically difficult to access. The significance of this methodology was demonstrated via further synthetic transformations of newly synthesized diazo compounds in cyclopropanation, epoxidation, N–H and O–H insertion reactions.     

Graphene Oxide as a Mediator in Organic Synthesis: a Mechanistic Focus

Graphene oxide (GO) is experiencing growing interest by synthetic organic chemists as a promoter of chemical transformations. The synergistic role of the multiple functionalities featuring the nanostructured carbon materials and their π-domains enables the interplay of specific activation modes towards organic compounds that can explore unprecedented chemical modifications. A detailed comprehension of the mechanistic details that govern the transformations guided by GO is a not fully solved task in the field. In this direction, more sophisticated and diversified techniques are employed, providing insights towards intriguing activation modes exerted by the π-matrix and the oxygenated/sulfonate groups decorating the functionalized nano-carbon material. The present Minireview accounts for a critical survey of the most recent developments in the area of GO-mediated organic transformations with a specific focus on mechanist aspects.     

Developments in the synthesis of α,α-dibromoacetophenones and related compounds

Increasing demand of α,α-dibromoketones, as highly reactive and easy-to-handle precursors to carry out selective organic transformations, to synthesize heterocyclic compounds of therapeutic interest and lack of any compilation on this subject prompted us to assemble the methods available for their synthesis.     

TEMPO and its derivatives mediated reactions under transition-metal-free conditions

2,2,6,6-Tetramethyl-l-piperidinyl-N-oxyl(TEMPO)and its derivatives as stable radicals can participate in many reactions.During the process,TEMPO and its derivatives could act not only as the substrates to capture or initiate new radical intermediates to provide new compounds but also as organic catalysts or oxidants for transformations of alkenes,alcohols,aldehydes and so on to synthesize various high valueadded compounds.In this review,we would introduce recent advances of the transformations of different substrates mediated by TEMPO and its derivatives under transition-metal-free conditions.     

Recent advances in radical-mediated fluorination through C–H and C–C bond cleavage

The C–H and C–C bonds are abundant in organic compounds, yet generally inert in chemical transformations. Therefore, direct functionalization of inert chemical bonds remains challenging. The fluorine-containing compounds are of special interest for their uses in medicinal chemistry. Direct fluorination of C–H and C–C bonds undoubtedly represents one of the most ideal and attractive approaches to incorporate fluorine atom into complex molecules. Herein, we summarize the recent advances in radical-mediated C–H and C–C bond fluorination. Three types of transformations are discussed: (1) direct C–H abstraction/fluorination of alkanes; (2) decarboxylative fluorination of alkyl carboxylic acids; (3) ring-opening fluorination.     

The applications of hypervalent iodine(III) reagents in the constructions of heterocyclic compounds through oxidative coupling reactions

Hypervalent iodine(Ⅲ)reagents have been vastly used in many useful organic transformations.In this review article,we highlight the strategies that used the common hypervalent iodine(Ⅲ)reagents as oxidants to synthesize the heterocyclic compounds,based on the patterns of bond formation during the construction of the heterocyclic backbones.     

Recent advances on deoximation: From stoichiometric reaction to catalytic reaction

Recent advances on the deoximation reactions are reviewed in this review. It was shown that catalytic deoximation with molecular oxygen as the mild oxidant should be the developing trend of the reaction.     

Insertion of functional groups into a Nd3+ metal-organic framework via single-crystal-to-single-crystal coordinating solvent exchange

Single-crystal-to-single-crystal (SCSC) transformations represent some of the most fascinating phenomena in chemistry. They are not only intriguing from a basic science point of view but also provide a means to modify or tune the properties of the materials via the postsynthetic introduction of suitable guest molecules or organic functional groups into their structures. Here, we describe UCY-2, a new flexible Nd(3+) metal-organic framework (MOF), which exhibits a unique capability to undergo a plethora of SCSC transformations with some of them being very uncommon. These structural alterations involve the replacement of coordinating solvent molecules of UCY-2 by terminally ligating solvents and organic ligands with multiple functional groups including -OH, -SH, -NH-, and -NH(2) or their combinations, chelating ligands, anions, and two different organic compounds. The SCSC coordinating solvent exchange is thus demonstrated as a powerful method for the functionalization of MOFs.     

Daily cycle of variability contents of phosphorus forms in surface microlayer of a light salinity Baltic Sea Lagoon lake (North Poland) — Part II

A daily cycle of tests was conducted to specify the concentration variation of phosphorous compounds and other chemical parameters at surface microlayers of a shallow lagoon lake located on the Baltic Coast. The water for analyses was collected from Lake Do?gie Wielkie in one hour cycles for the period of 24 hours. Samples were collected from the surface microlayers that had a thickness of 80–115 µm and 250–300 µm as well as from the subsurface water at the depth of 15 cm. Data analysis shows information concerning the migration of phosphorous compounds between the analyzed layers. Correlations were estimated for the obtained concentrations of phosphorous compounds and the nitrogen compounds and other physico-chemical values which were described in the first part of the cycle. The content of nutrients in the examined surface water layers correlated with the oxygen consumption due to the value of the oxygen consumption mostly depending on the concentration of organic matter.     

Nickel Catalyzed Functionalization of Allenes

Over the past few years, nickel catalysis “encountered” allenes in organic transformations, opening direct access to a plethora of chemical scaffolds in straightforward manner. The activation of allenes or their reaction partners by means of [Ni(0)] as well as [Ni(II)] species enabled chemical diversity and complexity to be achieved simultaneously through desirable concepts like selectivity, functional group tolerance and mildness. An overview of the most recent findings in the area is presented herein.