Abstract
The regioselective nitroso Diels-Alder (NDA) reactions of trans 3-butadienyl-2-azetidinones with nitrosoarenes leading to the synthesis of novel and diastereomerically pure 3-(3,6-dihydro-2H-1, 2-oxazin-6-yl) azetidin-2-one derivatives and cis 3-butadienyl-2-azetidinones resulting in a diastereoselective mixture of regioisomers are investigated. The observed regioselective behavior is supported by computational model, Ab initio [HF/6-31G (d)] and density functional theory [B3LYP/6-31G (d)] calculations. Additionally, the effect of solvation (in dichloromethane) in these reactions was also investigated in order to mimic the experimental solvent conditions. Keywords: 1, 2-oxazinyl-azetidine-2-one, 3-Dienyl-β-lactams, DFT calculations, nitroso diels-Alder reactions, nitrosoarenes, streptazolin, lepadins, 6-epitrehazolin, lyxopiperidinose, lycoricidine
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