Abstract
Starting from 1,3-oxazoline 6 synthesis of ketene-O,N-acetals 2b, 2c is described via NBS bromination and HBr elimination. The N-sulfonyl-oxazolidines 10, 11 are synthesized by cyclization starting from aminoalcohol 7, 10d react with potassium t-butoxide to the oxazolidine 2d; 11d gives under the some conditions the ring opening product 12d, compound 10a is inert.
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