Enantioselective addition of methyllithium to a prochiral imine—the substrate in the Pomeranz–Fritsch–Bobbitt synthesis of tetrahydroisoquinoline derivatives mediated by chiral monooxazolines
作者:Agata Głuszyńska、Maria D. Rozwadowska
DOI:10.1016/j.tetasy.2004.08.011
日期:2004.10
monooxazoline ligands 7–24 with substituents at C-2 and C-4, differing in electronic and steric properties, has been synthesized from (+)-thiomicamine 6. The effect of the oxazoline structure on the course of addition of methyllithium to imine 1 has been studied. The addition product, amine 3, which is the key intermediate in the Pomeranz–Fritsch–Bobbitt synthesis of tetrahydroisoquinoline derivatives, has
一系列手性monooxazoline的配体7 - 24 thiomicamine -在C-2和C-4具有取代基时,在电子和空间性质不同,已经从(+)合成6。已经研究了恶唑啉结构对向亚胺1添加甲基锂的过程的影响。加成产物胺3是四氢异喹啉衍生物在Pomeranz-Fritsch-Bobbitt合成中的关键中间体,已获得了高收率(92%)和ee高达76%。