The Chiral Pool as Valuable Natural Source: New Chiral Mesogens Made From Lactic Acid
摘要:
Twenty new enantiopure chiral materials have been synthesized, showing liquid crystalline phases of smectic (SmA*), twisted grain boundary (TGB) and cholesteric (N*) type. The central ester-linkage as well as the length of the attached alkyl-chains were varied in a systematic way and the effects of these structural changes on the liquid crystalline properties have been studied. The liquid crystalline phases were characterized by means of differential scanning calorimetry, polarisation microscopy as well as small angle X-ray diffraction (SAXS).
Chiral cyclobutanone which had ethyl L-lactate as a chiral auxiliary at the 3-position reacted with aldehydes to give 2,3-dihydro-4-pyranones in up to 93% ee by combined use of titanium(IV) chloride and tin(II) chloride.
Mesomorphic and structural properties of liquid crystal possessing a chiral lactate unit
The mesomorphic and structural properties of the chiral lactic acid derivative 4'-(1-(octyloxy)-1-oxopropan-2-yloxy) biphenyl-4-yl 4-(decyloxy)benzoate have been studied. The compound shows the blue phase (BPII), the cholesteric (N*), the TGB(A) and the paraelectric SmA* phases over a broad temperature range. Polarising optical microscopy, differential scanning calorimetry, optical transmission, X-ray diffraction and dielectric spectroscopy studies have been performed. In the SmA* phase the layer spacing (d) values are found to be slightly temperature dependent and suggest that there is no bi-layer association present in the mesophase. In the TGB(A) phase, the d values show strong temperature dependence near SmA*-TGB(A) phase transition, indicating pre-transitional effect. The temperature dependence of scattered X-ray intensities indicate the appearance of long range smectic ordering at the N*-TGB(A) phase transition. Near the TGB(A)-SmA* phase boundary strong SmA* fluctuations predominate. This behaviour is also observed from the temperature dependence of the d values. The transverse correlation lengths, xi(perpendicular to), diverge near the N*-TGB(A) phase transition indicating second order phase transition. (C) 2012 Elsevier B.V. All rights reserved.
[EN] COMPOUNDS USEFUL IN HIV THERAPY<br/>[FR] COMPOSÉS UTILES DANS LA THÉRAPIE DU VIH
申请人:VIIV HEALTHCARE CO
公开号:WO2021194828A1
公开(公告)日:2021-09-30
The invention relates to compounds of Formula (I), salts thereof, pharmaceutical compositions thereof, as well as methods of treating or preventing HIV in subjects.
这项发明涉及公式(I)的化合物,其盐,药物组合物,以及治疗或预防HIV的方法。
The Chiral Pool as Valuable Natural Source: New Chiral Mesogens Made From Lactic Acid
作者:F. Brombach、J. M. Neudörfl、D. Blunk
DOI:10.1080/15421406.2011.569689
日期:2011.6.30
Twenty new enantiopure chiral materials have been synthesized, showing liquid crystalline phases of smectic (SmA*), twisted grain boundary (TGB) and cholesteric (N*) type. The central ester-linkage as well as the length of the attached alkyl-chains were varied in a systematic way and the effects of these structural changes on the liquid crystalline properties have been studied. The liquid crystalline phases were characterized by means of differential scanning calorimetry, polarisation microscopy as well as small angle X-ray diffraction (SAXS).