Aza-[1,2]-Wittig rearrangements of N-benzyl glycine methyl esters. A new approach to the synthesis of N-aryl phenylalanine derivatives
摘要:
Treatment of N-(arylmethyl)-N-aryl glycine methyl ester derivatives with Bu2BOTf and (Pr2NEt)-Pr-i effects an aza-[1,2]-Wittig rearrangement that provides N-aryl phenylalanine methyl esters in good yields. Analogous substrates bearing N-carbonyl groups are converted to 1,4,2-oxazaborole derivatives under similar conditions. (C) 2015 Elsevier Ltd. All rights reserved.