Enantioselective synthesis of 2-[(3-ethyl-4-piperidyl)methyl]indoles from a phenylglycinol-derived lactam: formal synthesis of Strychnos alkaloids
作者:Mercedes Amat、Núria Llor、Begoña Checa、Maria Pérez、Joan Bosch
DOI:10.1016/j.tetlet.2007.07.079
日期:2007.9
A diastereodivergent synthesis of enantiopure cis- and trans-2-[(3-ethyl-4-piperidyl)methyl]indole (cis-1b and trans-1b) from a common phenylglycinol-derived oxazolopiperidone lactam 3 is reported. The key step is a stereocontrolled conjugate addition, either under kinetic or thermodynamic control, of the dilithium salt of 2-(2-indolyl)-1,3-dithiane to unsaturated lactam 3.
的对映体纯甲diastereodivergent合成顺式-和反式-2 - [(3-乙基-4-哌啶基)甲基]吲哚(顺式- 1B和反式- 1B从一个共同的苯基甘氨醇衍生oxazolopiperidone内酰胺)3报道。关键步骤是在动力学或热力学控制下,将2-(2-吲哚基)-1,3-二噻吩二锂盐的立体控制共轭物添加到不饱和内酰胺3中。