Formal [3+2] Cycloaddition Between in situ Formed 1,4‐Benzodiazepin‐2‐One‐Based Azomethine Ylides and Azodicarboxylic Acid Derivatives: Diastereoselective Synthesis of Spiro‐1,4‐Benzodiazepin‐2‐Ones
作者:Xiao‐Zu Fan、Hui‐Hui Wu、Zhe Tang、Heng Zhang、Lu‐Yu Cai、Xiao‐Fan Bi、Hong‐Wu Zhao
DOI:10.1002/adsc.202001486
日期:2021.3.2
In the presence of PhCO2H (20 mol%), the formal [3+2] cycloaddition between in situ formed 1,4‐benzodiazepin‐2‐one‐based azomethine ylides and azodicarboxylic acid derivatives proceeded readily, thus leading to the formation of trans‐configured spiro‐1,4‐benzodiazepin‐2‐ones in up to 98% chemical yield with >20:1 dr. The relative configuration of the title compounds was unambiguously determined by
在存在PhCO 2 H(20 mol%)的情况下,原位形成的1,4-苯并二氮杂-2-2-酮基偶氮甲亚胺与偶氮二羧酸衍生物之间的正式[3 + 2]环加成反应很容易进行,从而导致形成的反式-型螺- 1,4-苯并二氮杂-2-酮在高达98%的化学产率> 20:1个 博士。标题化合物的相对构型是通过X射线单晶结构分析明确确定的。假设反应机理是考虑到了孤立的螺-1,4-苯并二氮杂-2--1-酮的非对映选择性形成。