Abstract
Cyclic secondary α-amino acids react regiospecifically, via antidipole formation, with aldehydes bearing electron withdrawing substituents to give oxazolidines in good yield. In certain cases structural features in the α-amino acid promote a 1,4-prototropic process in the intermediate azomethine ylide and divert the reaction to give 2-pyrrolines, whilst use of ninhydrin as the carbonyl component results, in favourable cases, in stable azomethine ylides.
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