Stereocontrolled (Me<sub>3</sub>Si)<sub>3</sub>SiH-Mediated Radical and Ionic Hydride Transfer in Synthesis of 2,3,5-Trisubstituted THF
作者:Simon Grélaud、Valérie Desvergnes、Yannick Landais
DOI:10.1021/acs.orglett.6b00303
日期:2016.4.1
stereoselectively through a two-step process involving the addition of an acyl radical to a β-silyloxy acrylic ester followed by an acid-catalyzed desilylation–ketalization sequence and a final oxocarbenium reduction step. High levels of 1,2- and 1,3-stereocontrol were attained when (Me3Si)3SiH was used as a radical followed by a ionic hydrogen transfer agent.
2,3,5-三取代的四氢呋喃是通过两步过程立体选择性地制备的,该过程包括向β-甲硅烷氧基丙烯酸酯中添加酰基,然后进行酸催化的甲硅烷基化-缩酮化序列和最后的氧碳鎓还原步骤。当使用(Me 3 Si)3 SiH作为自由基,随后使用离子氢转移剂作为自由基时,可以实现高水平的1,2-和1,3-立体控制。