The reaction of thiolates with 2,3-Dibromo-1-propanol (cas 96-13-9) revisited: application to the synthesis of bis(fattyalkylthio)propanols

Add time:07/11/2019    Source:sciencedirect.com

This work compares two reaction schemes for preparing 2,3-bis(fattyalkylthio)-1-propanols for further synthetic adaptation as hydrophobic analogs of lung surfactant phosphatidylcholines. An attempt to prepare 2,3-bis(fattyalkylthio)-1-propanols based on the previously published methods of Bell and co-workers (B.R. Ganong, C.R. Loomis, Y.A. Hannun, R.M. Bell, 1986. Proc. Natl. Acad. Sci. USA 83, 1184–1188; B.R. Ganong, R.M. Bell, 1987. Methods Enzymol. 141, 313–320; J.P. Walsh, L. Fahrner, R.M. Bell, 1990. J. Biol. Chem. 265, 4374–4381) was found to give the rearranged 1,3-bis(fattyalkylthio)-2-propanols as major products. As a reliable alternative, the reaction of ethyl 2,3-dibromopropionate with 2 equivalents of long chain sodium n-alkanethioates gave the corresponding ethyl 2,3-bis(n-alkylthio)propionates, which were then reduced with LiAlH4 to yield the desired 2,3-bis(fattyalkylthio)-1-propanols. Both 13C and 1H NMR spectroscopy were used to differentiate the two possible 1,3- and 2,3-dithio substituted alcohol products and to rigorously assign their structures.

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