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Efficient Syntheses and Ring-Opening Reactions of trans- and cis-Oxazoline-5-carboxylates

Efficient Syntheses and Ring-Opening Reactions of trans- and cis-Oxazoline-5-carboxylates

  1. Alfa
    cis- and trans-Oxazoline-5-carboxylates were synthesized efficiently from isopropyl trans-cinnamate utilizing the Sharpless AA reaction. trans-Oxazoline was much more reactive than the cis-isomer toward ring opening reactions. From ab initio molecular calculations, the cis-isomer was predicted to be less reactive than the trans-isomer by 2.7 kcal/mol. Both syn and anti acetylthio esters and anti diamino esters were synthesized from these cis- and trans-oxazoline-5-carboxylates.