Abstract
Efficient assembly of substituted oxazolo-, oxazino-, and oxazepinoisoindolinones ( 5– 7 , 12– 15 and 19 ) is described in three steps according to an acidic α-oxoamidoalkylation reaction from ready available phthalic anhydride by successive imidation, sodium borohydride reduction and intramolecular cationic cyclization involving N-acyliminium species. The relative stereochemistry accompanying these reactions was also discussed.
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