The present invention concerns prodrugs of opioid analgesics and pharmaceutical compositions containing such prodrugs. Methods for providing more consistent pain relief by increasing the bioavailability of the opioid analgesic with the aforementioned prodrugs are provided. The invention also provides for decreasing the adverse GI side effects of opioid analgesics.
Design of an Indolylphosphine Ligand for Reductive Elimination-Demanding Monoarylation of Acetone Using Aryl Chlorides
作者:Wai Chung Fu、Chau Ming So、Wing Kin Chow、On Ying Yuen、Fuk Yee Kwong
DOI:10.1021/acs.orglett.5b02344
日期:2015.9.18
elimination-demanding Pd-catalyzed mono-α-arylation of acetone is demonstrated and reported. The catalyst is tolerant of previously proven challenging electron-deficient aryl chlorides and provides excellent product yields with down to 0.1 mol % Pd. Preliminary investigations suggest that the rate-limiting step for the proposed system is the oxidative addition of aryl chlorides, in which it contradicts
C–H arylation reactions through aniline activation catalysed by a PANI-g-C<sub>3</sub>N<sub>4</sub>-TiO<sub>2</sub> composite under visible light in aqueous medium
作者:Liang Wang、Jun Shen、Sen Yang、Wenjie Liu、Qun Chen、Mingyang He
DOI:10.1039/c8gc00012c
日期:——
composite was prepared and found to be efficient for radical C–H arylationreactions. The arylation process involved coupling of in situ generated aryl diazonium salts from aniline with heteroarenes, enol acetates or benzoquinones under visible light in aqueous medium or pure water. A broad range of substrates survived the reaction conditions to provide the desired products in moderate to good yields
制备了聚苯胺(聚苯胺)-gC 3 N 4 -TiO 2复合材料,发现它对自由基CHH芳基化反应有效。芳基化过程涉及在水性介质或纯水中在可见光下将苯胺的原位生成的芳基重氮盐与杂芳烃,烯醇乙酸酯或苯醌结合。各种各样的底物在反应条件下均能幸存,以中等至良好的产率提供所需的产物。还实现了放大(10 mmol)合成。该半导体光催化剂显示出良好的光催化性能和稳定性。循环研究表明,这种复合材料很容易被回收,连续十次运行后,催化活性略有下降。
Salicylic Acid‐Catalyzed Arylation of Enol Acetates with Anilines
作者:Diego Felipe‐Blanco、Jose C. Gonzalez‐Gomez
DOI:10.1002/adsc.201800427
日期:2018.7.16
α‐Arylketones are both structure moieties commonly found in bioactive compounds and versatile synthetic intermediates for the preparation of drug‐like molecules. An operationally simple and scalable protocol has been developed to prepare α‐arylketonesfrom readily available aromatic amines and enolacetates (or silyl enol ethers). This metal‐free methodology features the use of salicylic acid as
Copper-catalyzed coupling of aryl iodides and tert-butyl β-keto esters: efficient access to α-aryl ketones and α-arylacetic acid tert-butyl esters
作者:Duo Zhao、Yongwen Jiang、Dawei Ma
DOI:10.1016/j.tet.2013.10.017
日期:2014.5
catalyzed coupling of aryl iodides with tert-butyl β-ketoesters proceeded smoothly at 40 °C in DMF, providing α-aryl ketones after acid-promoted deprotection and decarboxylation of tert-butyl ester group. While CuI/2-picolinic acid catalyzed coupling of aryl iodides with tert-butyl acetoacetate at 70 °C in dioxane delivered α-arylacetic acid tert-butyl esters upon spontaneous deacylation. A wide range of
CuI /反-4-羟基-1-脯氨酸催化的芳基碘化物与叔丁基β-酮酯的偶联在DMF中在40°C下顺利进行,在酸促进叔丁酯的脱保护和脱羧反应后得到α-芳基酮团体。CuI / 2-吡啶甲酸在二恶烷中于70°C催化芳基碘化物与乙酰乙酸叔丁酯偶合时,在自发脱酰作用下释放出α-芳酸叔丁酯。各种各样的官能团,例如乙酰基,甲氧基,腈,硝基,溴和氯与反应条件相容。