Journal
TETRAHEDRON-ASYMMETRY
Volume 19, Issue 12, Pages 1425-1429Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetasy.2008.06.001
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A simple and efficient method for the synthesis of allo- and threo-3,3'-dimethylcystine derivatives is reported. Various tosyl and bromo derivatives of Cbz-, Boc-, and Fmoc- Protected threonine methyl esters have been prepared and subjected to nucleophilic substitution with potassium thiocyanate in acetonitrile to yield the corresponding thiocyanate derivatives in moderate yield. The thiocyanates are readily converted to the corresponding allo- and threo-3,3'-dimethylcystine derivatives via reductive dimerization with benzyltriethylammonium tetrathiomolybdate. (C) 2008 Elsevier Ltd. All rights reserved.
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