of substituted beta-aminoxypropionic acids (AOPAs) were synthesized as analogues of antiinflammatory arylacetic acids (ArAAs), in which the Ar portion is substituted by the MAOMM, with the aim of evaluating whether any antiinflammatoryactivity could be obtained from this class of drugs after the substitution of the Ar with the MAOMM. The antiinflammatoryactivity of the AOPAs synthesized was determined
Amine-Free Approach toward<i>N</i>-Toluenesulfonyl Amidine Construction: A Phosphite-Mediated Beckmann-Like Coupling of Oximes and<i>p</i>-Toluenesulfonyl Azide
作者:Lauren M. Fleury、Erin E. Wilson、Monika Vogt、Tiffany J. Fan、Allen G. Oliver、Brandon L. Ashfeld
DOI:10.1002/anie.201305141
日期:2013.10.25
Atom hopping: A chlorophosphite‐mediated Beckmann ligation of oximes and p‐toluenesulfonyl azide gives access to N‐sulfonyl phosphoramidines in good to excellent yields. The reaction proceeds under exceptionally mild conditions and constitutes a bioorthogonal approach toward amidines by avoiding the use of amines and transition‐metal catalysts. dmp‐ol=3,3‐dimethylpropanediol.
A convenient method for converting oximes into enamides is disclosed. The process produces enamides without the concomitant production of a large volume of metallic waste.
The enamides are useful precursors to amides and amines.
Iridium‐Catalyzed Acid‐Assisted Hydrogenation of Oximes to Hydroxylamines
作者:Josep Mas‐Roselló、Christopher J. Cope、Eric Tan、Benjamin Pinson、Alan Robinson、Tomas Smejkal、Nicolai Cramer
DOI:10.1002/anie.202103806
日期:2021.7.5
stoichiometric amounts of methanesulfonic acid and reduced at room temperature, remarkably without cleavage of the fragile N−O bond. The exquisite functional group compatibility of our hydrogenation system was further demonstrated by additive tests. Experimental mechanistic investigations support an ionic hydrogenation platform, and suggest a role for the Brønstedacid beyond a proton source. Our studies
我们发现环金属化环戊二烯基铱 (III) 配合物是将肟均相氢化成羟胺产物的独特高效催化剂。稳定的铱 C,N 螯合至关重要,烷氧基取代的芳基酮亚胺配体可提供最佳催化性能。通过 X 射线晶体分析绘制了几种 Ir 配合物,以收集空间参数,这些参数可能指导更活性催化剂的合理设计。大量的肟和肟醚被化学计量的甲磺酸活化并在室温下被还原,显着地没有断裂脆弱的 NO 键。添加剂测试进一步证明了我们加氢系统的精细官能团兼容性。实验机理研究支持离子氢化平台,并建议布朗斯台德酸在质子源之外的作用。我们的研究提供了对这种新型酸性氢化的深入理解,并可能促进其改进和应用于其他具有挑战性的底物。
Compounds of Formula I: I and their pharmaceutically acceptable salts are useful for the inhibition of HIV reverse transcriptase. The compounds may also be useful for the prophylaxis or treatment of infection by HIV and in the prophylaxis, delay in the onset or progression, and treatment of AIDS. The compounds and their salts can be employed as ingredients in pharmaceutical compositions, optionally in combination with other antiviral agents, immunomodulators, antibiotics or vaccines.