“…71 The formation of amino ketone 79 as the sole product from isoxazoline 74 with R 1 = Me and R 2 = R 3 = R 4 = R 5 = = CO 2 Me suggests that the reaction follows pathway b. 72 However, the structures of the pyrroles obtained in most of the relevant studies correspond to the pathway passing through intermediate acylaziridine. 12,57,58,73-75 Moreover, according to NMR data, 63 thermolysis of 4 isoxazoline 80 initially leads to aziridine 81, which is transformed into pyrrole 82 (Scheme 26).…”