Synthesis of 5-aminoisoxazolines from N-allyl compounds and nitrile oxides via tandem isomerization-1,3-dipolar cycloaddition
作者:Piotr Bujak、Stanisław Krompiec、Joanna Malarz、Michał Krompiec、Michał Filapek、Witold Danikiewicz、Magdalena Kania、Katarzyna Gębarowska、Iwona Grudzka
DOI:10.1016/j.tet.2010.06.040
日期:2010.8
5-aminoisoxazolines via tandem catalytic isomerization (of N-allyl systems to N-(1-propenyl) systems)—1,3-dipolar cycloaddition (of a stable nitrile oxide to N-(1-propenyl) systems) is presented. Rhodium and ruthenium complexes, Verkade’s superbase, and 18-crown-6/KOH system were used for the syntheses of the N-(1-propenyl) systems. 4-P-substituted isoxazoline was also synthesized via cycloaddition of
通过串联催化异构化(从N-烯丙基体系到N-(1-丙烯基)体系)-1,3-偶极环加成(从稳定的腈氧化物到N-(1 )合成5-氨基异恶唑啉衍生物的新策略-丙烯基)系统)。铑和钌配合物,Verkade的超碱和18冠-6 / KOH体系用于合成N-(1-丙烯基)体系。还通过将二苯基(1-丙烯基)膦(通过烯丙基二苯基膦的异构化制备)环加成为2,6-二氯苄腈,来合成4- P-取代的异恶唑啉。所有的环加成是区域选择性的,但不是立体选择性的,并且没有协同作用。环加成至所有N-(1-丙烯基)系统产生5- N-取代的异恶唑啉,但是环加成至P-(1-丙烯基)系统导致形成4- P-区域异构体。区域选择性的这种差异是通过为模型化合物计算的相对FMO反应性指数预测的:N-(1-丙烯基)胺和N-(1-丙烯基)膦。