描述了一种新的合成方法,用于合成带有四个(A 4,顺式-A 2 B 2,顺式-ABC 2,反式-A 2 B 2)或更少(A,顺式-AB,顺式-A 2,反式- A 2)内消旋取代基。该方法需要在金属盐(MgBr 2,3摩尔当量)和非配位碱(DBU,10摩尔当量)在非配位溶剂(甲苯)中加热(常规或微波辐射)并暴露于空气中。反式-A 2 B 2-或反式-A 2-卟啉的合理合成是通过两个相同的1-酰基二吡咯甲烷的缩合反应实现的。各种内消旋的统计综合通过两个不相同的1-酰基吡咯烷甲烷的缩合获得取代的卟啉。两种途径都具有吸引人的特征,包括(1)无加扰;(2)高浓度(100 mM)的大环形成步骤中的高收率(最高60%);(3)合理的范围(芳基,杂芳基,烷基或无取代基),(4)微波辐射反应时间短(〜2 h),(5)容易进行脱金属的卟啉镁产物和(6)色谱纯化简便。统计途径的主要优点是获得了顺式取代的卟啉,而没有相应的反式异构体。例如,A
[EN] PYRROLOPYRIDAZINE DERIVATIVES<br/>[FR] DERIVES DE PYRROLOPYRIDAZINE
申请人:FUJISAWA PHARMACEUTICAL CO
公开号:WO2004063197A1
公开(公告)日:2004-07-29
The invention relates to compound of the formula (I) or its salt, in which R1, R2, R3 and R4 are as defined in the description, their use of as medicament, the process for their preparation and use for the treatment of PDE-IV or TNF-α mediated diseases.
The invention relates to compound of the formula (I) or its salt, in which R
1
, R
2
, R
3
and R
4
are as defined in the description, their use of as medicament, the process for their preparation and use for the treatment of PDE-IV or TNF-α mediated diseases.
Two-Photon Oxygen Sensing with Quantum Dot-Porphyrin Conjugates
作者:Christopher M. Lemon、Elizabeth Karnas、Moungi G. Bawendi、Daniel G. Nocera
DOI:10.1021/ic4011168
日期:2013.9.16
Supramolecular assemblies of a quantum dot (QD) associated to palladium(II) porphyrins have been developed to detect oxygen (pO(2)) in organic solvents. Palladium porphyrins are sensitive in the 0-160 Torr range, making them ideal phosphors for in vivo biological oxygen quantification. Porphyrins with meso pyridyl substituents bind to the surface of the QD to produce self-assembled nanosensors. Appreciable overlap between QD emission and porphyrin absorption features results in efficient Forster resonance energy transfer (FRET) for signal transduction in these sensors. The QD serves as a photon antenna, enhancing porphyrin emission under both one- and two-photon excitation, demonstrating that QD-palladium porphyrin conjugates may be used for oxygen sensing over physiological oxygen ranges.