作者:Bin Tan、Zugui Shi、Pei Juan Chua、Yongxin Li、Guofu Zhong
DOI:10.1002/anie.200805205
日期:2009.1.12
available α‐carbonyl oximes and α,β‐unsaturated aldehydes. The domino reaction proceeds through iminium activation of α,β‐unsaturated aldehydes, Michael addition using oximes as N‐selective nucleophiles, and aldolcondensation.
Electron transfer in bis-porphyrin donor-acceptor compounds with polyphenylene spacers shows a weak distance dependence
作者:Anna Helms、David Heiler、George McLendon
DOI:10.1021/ja00041a047
日期:1992.7
containing one, two, or three phenyl bridges. Complete synthetic details are provided. For studies of photochemicalelectrontransfer, mixed metals were incorporated, with zinc in one porphyrin macrocycle and Fe III (bis-imidazole) in the other macrocycle. When photoexcited, an electron is transferred from Zn to Fe III
已经合成了一系列亚苯基桥连的双卟啉加合物,包含一个、两个或三个苯桥。提供了完整的合成细节。为了研究光化学电子转移,加入了混合金属,锌在一个卟啉大环中,而 Fe III(双咪唑)在另一个大环中。当光激发时,一个电子从 Zn 转移到 Fe III
Normal and abnormal heme biosynthesis. Part 7. Synthesis and metabolism of coproporphyrinogen-III analogues with acetate or butyrate side chains on rings C and D. Development of a modified model for the active site of coproporphyrinogen oxidase
作者:Timothy D. Lash、Teresa R. Lamm、J. Andy Schaber、Wen-hsiang Chung、Eric K. Johnson、Marjorie A. Jones
DOI:10.1016/j.bmc.2010.12.053
日期:2011.2
methyl esters were synthesized by first generating a,c-biladienes by reacting a dipyrrylmethane with pyrrole aldehydes in the presence of HBr. Cyclization with copper(II) chloride in DMF, followed by demetalation with 15% H2SO4–TFA and reesterification, gave the required porphyrins in excellent yields. Hydrolysis with 25% hydrochloric acid and reduction with sodium-amalgam gave novel diacetate and dibutyrate
用与C和D吡咯亚基连接的乙酸酯或丁酸酯基制备了卟啉原III的类似物。相应的卟啉甲酯是通过在氢溴酸存在下使二吡咯基甲烷与吡咯醛反应生成α,c-胆二烯而合成的。在DMF中用氯化铜(II)环化,然后用15%H 2 SO 4 -TFA脱金属并再酯化,以极好的收率得到所需的卟啉。用25%盐酸水解并用汞齐钠还原,得到新颖的双乙酸盐和双丁酸盐卟啉原9。双乙酸酯9a将其与鸡红细胞溶血产物(CRH)一起孵育,但由于这些制剂中存在的两种酶的共同作用,给出了复杂的结果。尿卟啉原脱羧酶(URO-D)与原卟啉原氧化酶(CPO)的分离允许评估这两种酶对双乙酸酯底物的影响。卟啉原9A证明是CPO相对差的衬底相比于天然底物粪卟啉原-III,并且仅A环丙酸酯部分被加工成显著程度。用纯化的人重组CPO孵育9a可获得相似的结果。双乙酸酯9a也是URO-D的底物,在这种情况下,卟啉原单乙酸盐是主要产品;然而,第二乙酸酯单元的一些
Nitrite Ionic Liquids (IL-ONO and [bmim]NO<sub>2</sub>) as Effective Nitrosonium Sources for the Synthesis of<i>α</i>-Oximinoketones under Mild Heterogeneous Conditions
作者:H. Valizadeh、A. Shomali、H. Gholipour
DOI:10.1002/cjoc.201180452
日期:2012.1
nitrosated and converted to their corresponding α‐oximinoketones using task‐specific ionicliquids, 1‐(4‐nitritobutyl)‐3‐methylimidazolium chloride, IL‐ONO, and 1‐butyl‐3‐methylimidazolium nitrite at room temperature. The results from two ionicliquids are comparable and showed that these IL's are effectivenitrosoniumsources for the preparation of oximinoketones. The protocol is rapid, the yields are excellent
Effect of <i>M</i><i>eso-</i>Substituents on the Osmium Tetraoxide Reaction and Pinacol−Pinacolone Rearrangement of the Corresponding <i>v</i><i>ic</i>-Dihydroxyporphyrins
作者:Yihui Chen、Craig J. Medforth、Kevin M. Smith、James Alderfer、Thomas J. Dougherty、Ravindra K. Pandey
DOI:10.1021/jo0100143
日期:2001.6.1
exclusively. These results indicate that it is not possible to predict the reactivity of meso-substituted porphyrins in the osmium tetraoxide reaction nor the general substituent migratoryaptitudes in the pinacol-pinacolone rearrangement based on simple electronic arguments, most likely because many parameters (e.g., meso-beta-pyrrolic steric crowding and long-range electronic effects) ultimately determine