TY - JOUR A1 - Schmiedel, Volker Martin A1 - Stefani, Stefano A1 - Reissig, Hans-Ulrich T1 - Stereodivergent synthesis of jaspine B and its isomers using a carbohydrate-derived alkoxyallene as C3-building block JF - Beilstein Journal of Organic Chemistry PY - 2013/// VL - 9 SP - 2564 EP - 2569 SN - 1860-5397 DO - 10.3762/bjoc.9.291 PB - Beilstein-Institut JA - Beilstein J. Org. Chem. UR - https://doi.org/10.3762/bjoc.9.291 KW - chiral auxiliaries KW - gold catalysis KW - jaspine B KW - lithiated alkoxyallenes KW - natural product synthesis KW - pachastrissamine KW - tetrahydrofurans N2 - Herein we present the synthesis of the anhydrophytosphingosine jaspine B and three of its stereoisomers using a carbohydrate-derived alkoxyallene in order to obtain the products in enantiopure form. Key step of the reaction sequence is the addition of the lithiated alkoxyallene to pentadecanal, setting the configuration at the later C-2 of the ring system. This reaction step proceeds with moderate selectivity and therefore leads to a stereodivergent approach to the natural product and its enantiomer. The gold-catalyzed 5-endo-cyclization affords the corresponding dihydrofurans, which after separation, azidation of the enol ether moiety and two subsequent reduction steps give the natural product and its stereoisomers. ER -