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The antibiotic β‐amino acid oxetin ( rac ‐ 1 ) has been prepared by the stereoselective Paternò‐Büchi reaction of enecarbamate 2 and n ‐butyl glyoxylate ( 5 ). The overall yield of the four‐step synthesis is 14%. The order of the deprotection steps proved to be important in minimizing possible side reactions.
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Bach et al. (1997) studied this question.
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