Oxidation of 3-amino-2-isobutylquinazoline-4-one (2) with lead tetraacetate at -20-degrees-C gave N-acetoxyamino-2-isobutylquinazolin-4-one (3), which selectively aziridinated olefinic esters to yield substituted 1-(2'-isobutylquinazolin-4'-one-3'-yl)-aziridine-2-carboxylates 5a-q.
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.