Preparation of 2,4-Disubstituted Cyclopentenones by Enantioselective Iridium-Catalyzed Allylic Alkylation: Synthesis of 2′-Methylcarbovir and<i>TEI-9826</i>
作者:Pierre Dübon、Mathias Schelwies、Günter Helmchen
DOI:10.1002/chem.200800495
日期:2008.7.28
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.
通过将不对称铱催化的烯丙基烷基化反应与钌催化的闭环复分解相结合,已开发出一种广泛适用的手性2-或2,4-取代的环戊-2-烯酮的合成方法。对映体过量(ee值)在ee的95-99%之间。这种方法可以直接获得PGA型生物活性前列腺素。例如,已经进行了前列腺素-类似物13,14-二氢-15-脱氧-δ(7)-前列腺素-A1-甲酯(TEI-9826)的对映选择性合成。此外,已经通过Pd催化的烯丙基胺化由O-保护的4-羟甲基-2-甲基-环戊-2-烯酮制备了碳核苷2'-甲基卡波韦。