Recyclable palladium-catalyzed carbonylative annulation of 2-iodoanilines with acid anhydrides: A practical synthesis of 2-alkylbenzoxazinones
作者:Zebiao Zhou、Bin Huang、Mingzhong Cai
DOI:10.1080/00397911.2021.1966039
日期:2021.10.18
highly efficient heterogeneous palladium-catalyzedcarbonylative annulation of 2-iodoanilines and acidanhydrides has been developed. The reaction proceeds effectively in toluene using N,N-diisopropylethylamine (DiPEA) as the base at 100 °C under 2 bar of CO and provides a novel, general, and practical method for the assembly of a wide variety of 2-alkylbenzoxazinones with high functional group tolerance
摘要 已经开发了一种高效的多相钯催化的 2-碘苯胺和酸酐的羰基化环化。该反应在甲苯中使用N,N-二异丙基乙胺 (DiPEA) 作为碱在 100 °C 和 2 bar CO 下有效进行,为组装各种具有高官能团耐受性和良好的收率。这种负载的钯配合物可以很容易地从产物中分离出来,并通过反应溶液的简单过滤进行回收,并以几乎一致的催化效率重复使用多达七次。
A General Palladium-Catalyzed Carbonylative Synthesis of 2-Alkylbenzoxazinones from 2-Bromoanilines and Acid Anhydrides
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1002/chem.201202142
日期:2012.10.1
(C), its (O)K! An efficient palladium‐catalyzed carbonylativesynthesis of 2‐alkylbenzoxazinones has been developed (see scheme). By starting from 2‐bromoanilines and acidanhydrides, the corresponding products were isolated in good yields.
Rhomboid proteases form one of the most widespread intramembraneprotease families. They have been implicated in variety of human diseases. The currently reported rhomboid inhibitors display some selectivity, but their construction involves multistep synthesis protocols. Here, we report benzoxazin-4-ones as novel inhibitors of rhomboid proteases with a covalent, but slow reversible inhibition mechanism
Selective Oxidative Decarbonylative Cleavage of Unstrained C(<i>sp</i><sup>3</sup>)–C(<i>sp</i><sup>2</sup>) Bond: Synthesis of Substituted Benzoxazinones
作者:Ajay Verma、Sangit Kumar
DOI:10.1021/acs.orglett.6b02142
日期:2016.9.2
A transition metal (TM)-free practical synthesis of biologically relevant benzoxazinones has been established via a selective oxidative decarbonylative cleavage of an unstrained C(sp3)–C(sp2) bond employing iodine, sodium bicarbonate, and tbutyl hydroperoxide in DMSO at 95 °C. Control experiments and Density Functional Theory (DFT) calculations suggest that the reaction involves a [1,5]H shift and
Catalytic aza-Wittig Reaction of Acid Anhydride for the Synthesis of 4<i>H</i>-Benzo[<i>d</i>][1,3]oxazin-4-ones and 4-Benzylidene-2-aryloxazol-5(4<i>H</i>)-ones
copper-catalyzed reduction of phosphine oxide was used and found effective for this transformation. Additionally, the one-pot catalyticaza-Wittig reaction of carboxylic acids was achieved. Furthermore, NMR experiments and Hammett plot recorded the process of catalyticaza-Wittig reaction of anhydride, which provides direct proof that the copper-catalyzed reduction of waste phosphine oxide is the key step
与醛,酮,酰胺和酯的aza-Wittig反应相比,酸酐的aza-Wittig反应总是被忽略,这应该是Wittig反应的重要组成部分。在这里,酸酐的aza-Wittig反应和酸酐的aza-Wittig催化反应均以高收率开发,这为合成4 H-苯并[ d ] [1,3]恶嗪-4-酮和4-亚苄基-2-芳基恶唑-5(4 H)-那些。使用了铜催化的氧化膦还原的策略,发现该策略对这种转化有效。另外,实现了羧酸的一锅催化的氮杂-维蒂希反应。此外,NMR实验和Hammett曲线记录了酸酐的催化氮杂-维蒂希反应过程,这直接证明了铜催化的废氧化膦的还原是该转化过程中的关键步骤。