nucleophilic aziridine ring opening with a lower order indolyl magnesium cuprate obtaining the α,β-substituted tryptamines 5 and secondly, a “Pictet-Spengler-like” reaction between azalactones 12 and tryptamines 5. Under the acidic reaction conditions used, the thermodynamically favoured tetrahydro β-carbolines 4 are obtained due to the conformational restrictions imposed by the tryptamine substituents
                                    通过两次选择性转化,从
吲哚6中制备了1,3,4-取代的四氢β-咔啉4:首先,用低级
吲哚基
镁铜酸盐进行亲核
氮丙啶开环,得到α,β-取代的
色胺5,其次,“氮杂内酯12和
色胺5之间的“ Pictet-Spengler样”反应。在所用的酸性反应条件下,由于
色胺的取代基所施加的构象限制,获得了热力学上优选的四氢β-咔啉4。