Synthesis of an Optically Active Decahydro-6-isoquinolone Scaffold with a Quaternary Stereocenter
作者:Jens Christoffers、Heiko Scharl、Wolfgang Frey、Angelika Baro
DOI:10.1002/ejoc.200400055
日期:2004.6
A straightforward synthesis of optically active decahydro-6-isoquinolone derivative 3, containing a quaternary stereocenter, is reported. The starting (R)-configured enantiopure enone 2, which is readily accessible through a copper-catalyzed, L-valine amide mediated Michael reaction and a subsequent Robinson annulation, was hydrogenated with Pd/C in iPrOH to give the decahydroisoquinolone 4. Treatment
报道了一种直接合成具有四元立体中心的光学活性十氢-6-异喹诺酮衍生物 3。起始 (R) 构型的对映纯烯酮 2 很容易通过铜催化的 L-缬氨酸酰胺介导的迈克尔反应和随后的罗宾逊环化获得,在 iPrOH 中用 Pd/C 氢化得到十氢异喹诺酮 4。在 PPTS 存在下用乙二醇对 4 进行合成,得到二氧戊环保护的衍生物 7。用 LiAlH 4 进行酯还原和随后对所得伯醇 10 进行 Ley 氧化完成合成。因此以63%的总产率获得对映异构纯的醛3,具有三个用于进一步官能化的基团。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)