Journal
TETRAHEDRON LETTERS
Volume 54, Issue 13, Pages 1730-1733Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.01.072
Keywords
Nonafluoro-tert-butoxy; Fluorous tag; Chiral carboxylic acid; Mitsunobu reaction
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Three novel alpha-(nonafluoro-tert-butoxy)carboxylic esters were synthesized by two methods: the Mitsunobu reaction of optically active (S)-alpha-hydroxycarboxylic esters and the Williamson synthesis starting from the corresponding O-mesyl derivatives. Both procedures from ethyl (S)-lactate resulted in the formation of a fluorous optically active (R)-lactic acid ester derivative, while the reactions from methyl (S)-mandelate took place with racemization. The proposed mechanism of this racemization is described. The conversion of methyl (S)-phenyllactate under Mitsunobu conditions was also stereospecific, but the reaction of its O-mesyl derivative yielded a mixture of substitution and elimination products. The optical purity of the alpha-(nonafluoro-tert-butoxy)carboxylic acids prepared by the hydrolysis of the above esters was determined by H-1 NMR spectroscopy. (C) 2013 Elsevier Ltd. All rights reserved.
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