multifunctional C3-symmetrical dendritic prolinamide with a hydrophobic aromatic core and hydrophilic triazolinium arms that exhibit high efficiency in catalyzing the asymmetricaldolreaction with cyclic ketones. The catalyst is water-compatible and remains active for five consecutive catalytic runs with a low catalyst loading (2 mol%), yielding the aldol products in high yields, diastereo- and enantioselectivities
stabilize G-quadruplex structures over duplex DNA compared to prolinamide dimers. The fluorescent intercalator displacement (FID) assay shows that a trimer with prolinamide side chains at the para-position of the benzene ring can discriminate between different quadruplex structures and exhibits the highest binding affinitytowards the c-MYC G-quadruplex structure. Molecular modeling studies reveal that
Synthesis and X-ray structural investigation of 1,3,5-tris[4-(2-propynyloxy)phenyl]benzene
作者:S. V. Lindeman、R. A. Dvorikova、I. R. Gol'ding、Yu. T. Struchkov、M. M. Teplyakov
DOI:10.1007/bf00699190
日期:1993.9
Synthesis and X-raystructuralinvestigation of 1,3,5-tris[4-(2-propynyloxy)phenyl]benzene (1) were carried out. Compound1 is a trifunctional monomer for the synthesis of cross-linked polymers and a model of a section of polymeric network of this kind. In a crystal, the molecule of1 is located on the threefold symmetry axis and has a propeller-like conformation (the dihedral angle between the central
进行了 1,3,5-三[4-(2-丙炔氧基)苯基]苯 (1) 的合成和 X 射线结构研究。化合物 1 是一种用于合成交联聚合物的三官能单体,是此类聚合物网络部分的模型。在晶体中,分子of1位于三重对称轴上,具有螺旋桨状构象(中心苯环和外围苯环之间的二面角为~35°)。1的晶体结构的一个基本特征是相邻分子的乙炔基团靠近,这可能有利于晶体中的环三聚。这个过程的空间先决条件是相邻分子围绕它们的对称轴同时旋转~10°。反应基团中原子的位移应为 ∼1.6-1.8 Å。
作者:Barada Prasanna Dash、Rashmirekha Satapathy、Barrie P. Bode、Cory T. Reidl、James W. Sawicki、Allen J. Mason、John A. Maguire、Narayan S. Hosmane
DOI:10.1021/om201255b
日期:2012.4.9
Phenylene-cored small dendrimers containing three to nine peripheral o-carborane clusters were synthesized via Cu(I)-catalyzed Huisgen-type azide alkyne cycloaddition reactions. The resulting dendrimers have been characterized by IR and NMR spectroscopy and MALDI-TOF mass spectral analysis. The biological evaluation of branched dendrimer 16 containing nine carborane cages has been carried out using human liver cancer cells (SK-Hep1). Dendrimer 16 was accumulated in the SK-Hep1 cancer cells in a concentration-dependent manner. The highest boron accumulation up to 2540 ng of boron/5 X 10(5) cells was observed at a 50 mu M concentration of 16 over a period of 20 h. The high accumulation of 16 into the tumor cell lines indicates that such dendritic boron drug delivery platforms could be possible for application in boron neutron capture therapy in cancer treatment.
Concave Macrobicycles: Absorption Spectra, Luminescence Properties, and Endocavital Complexation of Neutral Organic Guests
suggests a direct correlation between steric fit and orientation of the guest. On the basis of this hypothesis, the orientation of acetone in an endocavital inclusion of 2 was predicted and verified by X-ray analysis. Comparison of the single-crystal X-ray structures of the vacant macrobicycle 3 and of a family of macrobicycles showing endocavital or “pocket” complexation of neutral organic guests suggests