Catalytic Asymmetric (3 + 3) Cycloaddition of Oxyallyl Zwitterions with α-Diazomethylphosphonates
作者:Yan Liu、Xian Peng、Rui She、Xin Zhou、Yungui Peng
DOI:10.1021/acs.orglett.1c02809
日期:2021.9.17
The unique structure of oxyallyls represents a significant challenge for their catalytic asymmetric applications. Herein, an unprecedented chiral imidodiphosphoric acid-catalytic enantioselective (3 + 3) cycloaddition between oxyallyl zwitterions generated in situ from α-haloketones and α-diazomethylphosphonates was developed. Pharmaceutically interesting chiral pyridazine-4(1H)-ones were obtained
氧烯丙基的独特结构对其催化不对称应用提出了重大挑战。在此,开发了一种前所未有的手性亚氨基二磷酸催化的对映选择性(3 + 3)环加成反应,在由 α-卤代酮和 α-重氮甲基膦酸酯原位生成的氧烯丙基两性离子之间进行了环加成反应。药学上令人感兴趣的手性哒嗪-4( 1H )-酮以高达 98% 的收率获得,具有出色的立体选择性(高达 99% ee,> 99:1 dr)。