stereoselectivities (up to >20:1 dr and 98% ee). A detailed mechanistic explanation for stereoselective protonation in the dihydrooxazine was probed computationally. In addition, the probable intermediates in α-halogenation of aldehydes (masked with enamines) were isolated to provide crystallographic evidence.
通过手性α,α- 1-二苯基脯
氨醇甲
硅烷基醚助剂,通过分离二氢恶嗪N-氧化物中间体,建立了硝基
烯丙基胺的动力学拆分。进一步
水解静置态可提供高
化学产率和高至优异的立体选择性(高达> 20:1 dr和98%ee)的四氢
吡啶。通过计算探索了二氢恶嗪中立体选择性质子化的详细机理解释。另外,分离了醛的α-卤化中可能的中间体(被烯胺掩盖),以提供结晶学证据。