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Investigation of the Diels−Alder Cycloadditions of 2(H)-1,4-Oxazin-2-ones

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posted on 11.11.2005, 00:00 by Kamyar Afarinkia, Akmal Bahar, Michael J. Bearpark, Yésica Garcia-Ramos, Andrea Ruggiero, Judi Neuss, Maushami Vyas
A variety of 5-chloro-2(H)-1,4-oxazin-2-ones bearing a range of substituents at their 3- and 6-positions undergo Diels−Alder cycloaddition as a 2-azadiene component with electron-rich, electron-deficient, and electron-neutral dienophiles. These reactions proceed with moderate regio- and stereoselectivity to afford relatively stable and readily isolable bridged bicyclic lactone cycloadducts. Chemical manipulation of these cycloadducts affords highly substituted and functionally rich piperidines. The regio- and stereochemical preferences of the cycloadditions of 5-chloro-2(H)-1,4-oxazin-2-ones are investigated computationally using density functional theory (B3LYP/6-31G*).