- Side chain impacts on pH- and thermo-responsiveness of tertiary amine functionalized polypeptides
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The systemic investigation of the structural impacts of side chains on the pH- and thermo-responsiveness of tertiary amine functionalized poly(l-glutamate)s (TA-PGs) was carried out. The TA-PGs polymers were effectively synthesized by Cu(I)-catalyzed azide-alkyne cycloaddition click reaction of azido tertiary amines with poly(γ-propargyl-l-glutamate) (PPLG). Turbimetric measurements were performed to characterize the pH- and temperature-induced phase transition of TA-PGs in aqueous solution, which suggested a structural dependence of the properties on the N-substituted groups and the "linkers" between 1,2,3-triazole ring and the tertiary amine groups in the side chains. In detail, the pH responsive properties of TA-PGs were basically determined by the hydrophobicity of the N-substituted groups in the side chains and the pH transition point (pHt) decreased as the increasing hydrophobicity of the N-substituted groups, while the temperature-responsiveness of TA-PGs were affected by either the N-substituted groups or the "linkers." TA-PGs with a moderate N-substituted amine group (e.g., DEA, PR, and PD) or a branched "linker" (e.g., iso-propylene and 2-methylpropylene group) were more likely to express the LCST-type phase transition tuned by pH variation. These structure-property relationships revealed in this study would help to develop the applications of TA-PGs in smart drug delivery systems. Copyright
- Xiao, Chunsheng,Cheng, Yilong,Zhang, Yu,Ding, Jianxun,He, Chaoliang,Zhuang, Xiuli,Chen, Xuesi
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p. 671 - 679
(2014/02/14)
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- COMPOSITIONS AND METHODS FOR THE TREATMENT OF SEVERE PAIN
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The invention relates to the compounds of formula (I) or its pharmaceutical acceptable salts, as well as polymorphs, solvates, enantiomers, stereoisomers and hydrates thereof. The pharmaceutical compositions comprising an effective amount of compounds of formula (I), and methods for the treatment of severe pain may be formulated for oral, buccal, rectal, topical, transdermal, transmucosal, intravenous, parenteral administration, syrup, or injection. Such compositions may be used to treatment of chronic pain, generalized pain disorders, leukemia, cancer, chronic pain, chemotherapy induced pain, epilepsy, migraine, neuropathic pain, post herpetic neuralgia, neuralgia, pain, drug addiction, detoxification of drugs, Alzheimer's disease, multiple sclerosis, multiple sclerosis restless legs syndrome (RLS), cluster headache, depression, fibromyalgia, amyotrophic lateral sclerosis (ALS), convulsions, partial seizures, mood-stabilizing agent and bipolar disorder.
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Paragraph 0096; 0097
(2013/12/03)
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- Considerations to the synthesis of methadone-nitrile as well as isomethadone-nitrile, and related compounds
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The 2-chloro-1-dialkylamino-propanes 4a-d are reacted with diphenylacetonitrile under phase transfer conditions to give a mixture of the nitriles la-d and 2a-d. Both chloro-dialkylamino-1-phenyl-ethanes 7a-d and 8a-d lead to 4-dialkylamino-2,2,3-triphenyl-butyronitriles 6a-d.
- Unterhalt,Coesfeld
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p. 229 - 234
(2007/10/03)
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- Modification of methadone synthesis process step
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Alkylation of diphenylacetonitrile in methadone synthesis is carried out in presence of sodium hydroxide and DMF.
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