Efficient Rhodium-Catalyzed Conjugate Addition of Arylboronic Acids to Unsaturated Furano Esters for the Highly Stereoselective Synthesis of Four Natural Trisubstituted Furanolignans
作者:Aurélie Mondière、Guillaume Pousse、Didier Bouyssi、Geneviève Balme
DOI:10.1002/ejoc.200900643
日期:2009.9
(±)-sanshodiol methyl ether (1c) and (±)-acuminatin methyl ether (1d), were prepared stereoselectively in five steps from a 4-(arylmethylene)-2-methoxytetrahydrofuran derivative obtained by a MCR reaction. The key step of this synthesis is the microwave-assisted stereoselective addition of a boronic acid (Hayashi–Miyaura reaction) to a 4-ethoxycarbonyldihydrofuran, generating three contiguous stereogenic centers
四种天然木脂素,(±)-二氢芝麻素 (1a)、(±)-落叶松树脂甲醚 (1b)、(±)-sanshodiol 甲醚 (1c) 和 (±)-acuminatin 甲醚 (1d),在从通过 MCR 反应获得的 4-(芳基亚甲基)-2-甲氧基四氢呋喃衍生物的五个步骤。该合成的关键步骤是将硼酸(Hayashi-Miyaura 反应)微波辅助立体选择性加成到 4-乙氧基羰基二氢呋喃中,生成三个具有优异非对映选择性的连续立体中心。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)