Rearrangement of isoxazoline-5-spiro derivatives. Part 7. Thermal rearrangement of 4,5-dihydro and tetrahydroisoxazole-5-spirocyclobutanes to azepin-4-one derivatives
作者:Andrea Goti、Alberto Brandi、Francesco De Sarlo、Antonio Guarna
DOI:10.1016/s0040-4020(01)89026-8
日期:——
respectively. When subjected to flash vacuum thermolysis conditions, the spiranic cycloadducts rearranged to afford mainly the desired azepin-4-one derivatives. In addition, the isoxazoline cycloadducts gave unexpected by-products, which were identified as 1-alkenyl-2-pyrrolidinones. Analogies and differences with respect to the lower homologue cyclopropanes are evidenced in both cycloaddition and rearrangement
一些代表性的4,5-二氢和四氢异恶唑5-螺环丁烷是通过亚烷基环丁烷的1,3-偶极环加成分别合成腈氧化物和硝酮而合成的。当经受闪蒸真空热解条件时,芳基环加合物重新排列以主要提供所需的氮杂庚-4-酮衍生物。另外,异恶唑啉环加合物产生意外的副产物,其被鉴定为1-烯基-2-吡咯烷酮。在环加成反应和重排反应中均证明了与低级同系环丙烷的相似性和差异。