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
New synthesis of azepin-4-ones by flash vacuum thermolysis of dihydro and tetrahydroisoxazole-5-spirocyclobutane derivatives
作者:Andrea Goti、Alberto Brandi、Francesco De Sarlo、Antonio Guarna
DOI:10.1016/s0040-4039(00)85188-6
日期:1986.1
Azepin-4-ones () and () are synthesized by FlashVacuumThermolysis of the isoxazolines () and of the isoxazolidine () obtained by 1,3-dipolar cycloadditions to methylenecyclobutane.
The Mo(CO)6-mediated photoinduced ring-opening reactions of adamantane isoxazolines involve novel rearrangement that provide enaminoketones as major products and β-hydroxy ketones as minor ones; in contrast, only β-hydroxy ketones and α,β-unsaturated ketones were obtained under thermal condition.