Acid-catalyzed rearrangement of some steroidal isoxazolidines
作者:Milica M. Rajković、L.jubinka B. Lorenc、Ivan O. Juranić、Željko J. Vitnik、Mihailo Lj. Mihailovic
DOI:10.1016/s0040-4020(99)00314-2
日期:1999.5
Acid-catalyzed reaction of the steroidal Δ1-unsaturated 3β,5β-epoxyimino compound 2 and Δ3-unsaturated 1β,5β-epoxyimino products 3 and 7, results in intramolecular rearrangement involving the N-CH3 group to give the corresponding perhydro-3,1-oxazine derivatives 9–11. Under similar reaction conditions, the saturated analogues 4, 6 and 8 remain unchanged. The difference in reactivity between the unsaturated