Chiral N-phosphonyl imine chemistry: an efficient asymmetric synthesis of chiral N-phosphonyl propargylamines
作者:Parminder Kaur、Gaurav Shakya、Hao Sun、Yi Pan、Guigen Li
DOI:10.1039/b923914f
日期:——
A variety of substituted chiral propargylamines have been synthesized by reacting chiral N-phosphonylimines with lithium aryl/alkyl acetylides. Seventeen examples were studied to give excellent yields (>90%) and diastereoselectivities (96 : 4 to 99 : 1). It was found that the types of bases for generating acetylides and solvents are crucial for effectiveness of this asymmetric reaction. In addition, N,N-isopropyl group on chiral N-phosphonylimine auxiliary was proven to be superior to other protecting groups in controlling diastereoselectivity.
通过手性 N-膦酰亚胺与芳基/烷基乙酰化锂反应,合成了多种取代的手性丙炔胺。对 17 个实例进行了研究,结果表明它们具有极高的产率(大于 90%)和非对映选择性(96:4 至 99:1)。研究发现,生成乙酰化物的碱和溶剂类型对这一不对称反应的有效性至关重要。此外,在控制非对映选择性方面,手性 N-膦酰亚胺辅助剂上的 N,N-异丙基被证明优于其他保护基团。