The reaction of thiolates with 2,3-dibromo-1-propanol revisited: application to the synthesis of bis(fattyalkylthio)propanols.
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.
Gernon
M D
MD
Department of Medicinal Chemistry, University of Rhode Island, Kingston 02881, USA.
Turcotte
J G
JG
Notter
R H
RH
Mu
M
M
Lear
Y
Y
Snelgrove
J L
JL
Schwan
A L
AL
D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D020005:Propanols / Q000138:chemical synthesis* / Q000378:metabolism*; D013438:Sulfhydryl Compounds / Q000378:metabolism*
D020005:Propanols; D013438:Sulfhydryl Compounds; C016369:2,3-dibromopropanol