Preparation of 2,4-disubstituted cyclopentenones by enantioselective iridium-catalyzed allylic alkylation: synthesis of 2'-methylcarbovir and TEI-9826 |
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Authors: | Dübon Pierre Schelwies Mathias Helmchen Günter |
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Institution: | Organisch‐Chemisches Institut der Universit?t Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany), Fax: (+49)?6221‐544205 |
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Abstract: | A broadly applicable synthesis of chiral 2- or 2,4-substituted cyclopent-2-enones has been developed by combining asymmetric iridium-catalyzed allylic alkylation reactions and ruthenium-catalyzed ring-closing metathesis. Enantiomeric excesses (ee values) in the range of 95-99 % ee have been achieved. This method offers a straightforward access to biologically active prostaglandins of the PGA type. As an example, an enantioselective synthesis of the prostaglandin-analogue 13,14-dihydro-15-deoxy-Delta(7)-prostaglandin-A1-methyl ester (TEI-9826) has been carried out. Furthermore, the carbonucleoside 2'-methylcarbovir has been prepared from O-protected 4-hydroxymethyl-2-methyl-cyclopent-2-enone by Pd-catalyzed allylic amination. |
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Keywords: | allylic alkylation carbocyclic nucleosides cyclopentenones iridium phosphoramidites |
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