Polymer-Supported Stereoselective Synthesis of (1<i>S</i>,5<i>S</i>)-6-Oxa-3,8-diazabicyclo[3.2.1]octanes
作者:Eva Schütznerová、Allen G. Oliver、Jaroslav Zajíček、Viktor Krchňák
DOI:10.1002/ejoc.201300093
日期:2013.5
We describe a polymer-supported stereoselectivesynthesis of the (1S,5S)-6-oxa-3,8-diazabicyclo[3.2.1]octane-bridged scaffold by tandem iminium ion cyclization/nucleophilic addition reactions. A series of resin-bound acyclic intermediates bearing different substituents were prepared, and the scope and limitations of the chemical route leading to the bridged scaffold were evaluated. The Thr-derived
我们描述了聚合物支持的立体选择性合成 (1S,5S)-6-oxa-3,8-二氮杂双环 [3.2.1] 辛烷桥支架,通过串联亚胺离子环化/亲核加成反应。制备了一系列带有不同取代基的树脂结合无环中间体,并评估了导致桥接支架的化学途径的范围和局限性。发现 Thr 衍生的桥接支架在酸中比 Ser 衍生的支架更稳定,后者部分转化为二氢吡嗪酮。在形成亚胺的氮上的取代对酸稳定性至关重要,具有吸电子基团的 N-芳基磺酰胺通过酸介导的裂解产生最高纯度的粗产物。
Particulate construct comprising polyhydroxyalkanoate and method for producing it
申请人:——
公开号:US20030194443A1
公开(公告)日:2003-10-16
The invention provides a particulate construct such as microcapsules containing a drug, and serving a slow releasing preparation not associated with a practically unacceptable initial burst release but showing a practically acceptable zero-order release for a certain period and a producing method for such particulate construct, and a slow releasing preparation of a high drug content capable of stably incorporating the drug in the particulate construct such as microcapsules, and a producing method for such preparation.
The invention also provides a particulate construct such as microcapsules utilizing a highly functional polymer compound and incorporating oil phase and/or water phase in solid phase, and a producing method therefor.
Furthermore, the invention provides a particulate construct such as microcapsules having a hollow structure of a single polymer membrane as the outer shell and capable of containing many bubbles in the fine particles, and a producing method capable of preparing such construct with a high reproducibility.
According to the invention, a particulate construct such as microcapsules is formed with polyhydroxyalkanoate of a specified structure and a drug for a desired purpose, an oil phase and/or a water phase, or a gaseous phase is included in such construct.
Coloring composition for color filters containing microencapsulated pigment composed of polyhydroxyalkanoate
申请人:CANON KABUSHIKI KAISHA
公开号:US20030203458A1
公开(公告)日:2003-10-30
The invention provides coloring composition for color filters making use of a pigment, in which the dispersed state of the pigment is stable without using any surfactant, and so aggregation is hard to occur, and which permits formation of high-definition and high-quality images excellent in color rendition, transparency and contrast, and a simple production process thereof, by which the use of surfactants can be abolished, or the amount of surfactants used can be reduced to a great extent. The coloring composition for color filters is provided by using at least a coloring material obtained by coating at least part of surfaces of pigment particles with polyhydroxyalkanoate, and a dispersion medium for the coloring material.
Pigment containing ink and production method thereof
申请人:——
公开号:US20030203987A1
公开(公告)日:2003-10-30
A micro-capsulated pigment containing pigment ink being excellent in density, fineness, transparency, and coloring and color rendering properties required for ink solutions and having excellent dispersibility and dispersion stability with time due to the reduced particle size is provided. At least a color material with at least part of the surfaces of pigment particles covered with polyhydroxyalkanoate, and a medium for dispersion of the color material are used to obtain the pigment ink.
Particles for electrophoresis, a production method thereof and a display using the articles
申请人:——
公开号:US20030206330A1
公开(公告)日:2003-11-06
Electrophoretic particles for electrophoretic display having excellent dispersibility and dispersion stability with time for insulating media, and being protected against coagulation, settling and the like, a process for production of the electrophoretic particles having high versatility for pigments to be used in response to a full-color display, and an electrophoretic display device using the electrophoretic particles that has an excellent memory property and is highly reliable are provided. The electrophoretic particles are formed using as at least a part of structure a pigment with at least a part of the surface covered with polyhydroxyalkanoate.