Electrochemical Access to 8-(1-Phenyl-ethyl)-1,4-dioxa-8-aza-spiro[4.5]decane-7-carbonitrile. Application to the Asymmetric Syntheses of (+)-Myrtine and Alkaloid (+)-241D
作者:Van Ha Vu、Fadila Louafi、Nicolas Girard、Ronan Marion、Thierry Roisnel、Vincent Dorcet、Jean-Pierre Hurvois
DOI:10.1021/jo500104c
日期:2014.4.18
protecting group in piperidone derivatives was carried out by stirring them in a suspension of SnCl4·(Et2O)2 complex in diethyl ether. When appropriate, the er’s were determined by proton and carbon NMR spectroscopy utilizing (+)-tert-butylphenylphosphinothioic acid and (+)-DBTA as chiral solvating agents.
此处报道了反式-喹oli嗪(+)-肉豆蔻碱和顺式-2,4,6-三取代哌啶生物碱(+)-241D的两种对映体的总合成。我们的方法基于对映纯的4-哌啶酮(-)- 11的N -Boc定向金属化,该过程是从α-氨基腈6到立体选择性烷基化-还原脱氰过程四步制备的。通过4-哌啶酮(+)- 5的电化学氧化,在阳极制备了α-氨基腈6。在我们的研究中,α-苯乙胺(α-PEA)可以实现有效的1-3立体诱导,并且可以对N进行正交切割通过在SnCl 4 ·(Et 2 O)2络合物在乙醚中的悬浮液中搅拌将哌啶酮衍生物中的-Boc保护基进行。适当时,通过使用(+)-叔丁基苯基膦硫酸和(+)-DBTA作为手性溶剂化剂的质子和碳NMR光谱确定er 。