Isoxazoles. XXII. A New Synthesis of 4-Isoxazolines and Their Thermal Conversion into Pyrroles
作者:IKUO ADACHI、KIMIKO HARADA、RIE MIYAZAKI、HIDEO KANO
DOI:10.1248/cpb.22.61
日期:——
Thirteen N-substituted 4-isoxazoline derivatives were obtained by reaction of 3-unsubstituted and 3, 5-disubstituted isoxazolium salts with Grignard reagents. Similarly, 3-benzyl-2-methyl-2, 3, 4, 5-tetrahydronaphth [2, 1-d] isoxazoles and 3-benzyl-2-ethyl-2, 3-dihydrobenzisoxazole were produced by reaction of the corresponding quaternary salts with benzylmagnesium chloride. Thermal reactions of some 4-isoxazoline derivatives and 3-benzyl-2, 3, 4, 5-tetrahydronaphth [2, 1-d] isoxazole derivatives leading to substituted pyrrole derivatives and 3H-benz [e] indole derivatives were investigated. A tentative mechanism for the formation of pyrrole from 4-isoxazoline is also presented.
通过 3-未取代和 3,5-二取代的异噁唑鎓盐与格氏试剂反应,得到了 13 种 N-取代的 4-异噁唑啉衍生物。同样,相应的季盐与苄基氯化镁反应生成了 3-苄基-2-甲基-2,3,4,5-四氢萘[2,1-d]异噁唑和 3-苄基-2-乙基-2,3-二氢苯并异噁唑。研究了一些 4-异噁唑啉衍生物和 3-苄基-2,3,4,5-四氢萘[2,1-d]异噁唑衍生物的热反应,这些反应生成了取代的吡咯衍生物和 3H 苯并[e]吲哚衍生物。此外,还提出了由 4-isoxazoline 生成吡咯的初步机理。