Synthesis and Mesomorphic Properties of Two Series of Laterally Fluorinated Symmetric Ester Liquid Crystals
摘要:
Two series of symmetric ester liquid crystals (nAFBHQ and nADFBHQ) with lateral fluorine atoms have been synthesized. Their chemical structures were measured by FTIR, H-1 NMR, and elemental analysis (EA). Their mesomorphic properties were investigated by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). It was found that both series showed nematic phase only. And their melting point and clearing point decreased with the number of carbon atoms in alkoxy group. It can also be found that nAFBHQ have approximately the same temperatures of melting point but much higher temperatures of clearing point than their corresponding compound in nADFBHQ series.
Apolar Bimesogens and the Incidence of the Twist-Bend Nematic Phase
作者:Richard J. Mandle、Edward J. Davis、Craig T. Archbold、Constantin C. A. Voll、Jessica L. Andrews、Stephen J. Cowling、John W. Goodby
DOI:10.1002/chem.201500423
日期:2015.5.26
The nematictwist–bendphase (NTB) was, until recently, only observed for polar mesogenic dimers, trimers or bent‐core compounds. In this article, we report a comprehensive study on novel apolar materials that also exhibit NTB phases. The NTB phase was observed for materials containing phenyl, cyclohexyl or bicyclooctyl rings in their rigid‐core units. However, for materials with long (>C7) terminal
Discovery of 2,6-Dimethylpiperazines as Allosteric Inhibitors of CPS1
作者:Alan Rolfe、Shihua Yao、Toung-Vi Nguyen、Kiyoyuki Omoto、Federico Colombo、Milena Virrankoski、Frédéric H. Vaillancourt、Lihua Yu、Andrew Cook、Dominic Reynolds、Stephanos Ioannidis、Ping Zhu、Nicholas A. Larsen、David M. Bolduc
DOI:10.1021/acsmedchemlett.0c00145
日期:2020.6.11
Carbamoyl phosphate synthetase 1 (CPS1) is a potential synthetic lethal target in LKB1-deficient nonsmall cell lung cancer, where its overexpression supports the production of pyrimidine synthesis. In other cancer types, CPS1 overexpression and activity may prevent the accumulation of toxic levels of intratumoral ammonia to support tumor growth. Herein we report the discovery of a novel series of potent and selective small-molecule inhibitors of CPS1. Piperazine 2 was initially identified as a promising CPS1 inhibitor through a high-throughput screening effort. Subsequent structure-activity relationship optimization and structure-based drug design led to the discovery of piperazine H3B-616 (25), a potent allosteric inhibitor of CPS1 (IC50 = 66 nM).