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(R)-5,6-Dihydro-5-phenyl-1,4-oxazin-2-one N-oxide {(R-2} reacts with allyl alcohols 3a-c in the presence of magnesium bromide from the less hindered face via exo-mode to afford corresponding cycloadducts 4a-c with excellent stereoselection. Treatment of (R)-2 with three equivalents of racemic secondary allyl alcohols 3d-g under the same conditions causes partial kinetic resolution to give 4d-g as...
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