Enantioselective Synthesis of Spirorhodanine-Pyran Derivatives via Organocatalytic [3 + 3] Annulation Reactions between Pyrazolones and Rhodanine-Derived Ketoesters
作者:Dong-Sheng Ji、Yong-Chun Luo、Xiu-Qin Hu、Peng-Fei Xu
DOI:10.1021/acs.orglett.9b04571
日期:2020.2.7
A series of novel biselectrophilic β,γ-unsaturated α-ketoesters were designed and synthesized from rhodanine. Under the catalysis of chiral squaramides, the enantioselective [3 + 3] annulation reaction of these novel ketoesters with pyrazolones was developed. This reaction offers an efficient method for the synthesis of chiral 2'-thioxo-5,6-dihydrospiro[pyrano[2,3-c]pyrazole-4,5'-thiazolidin]-4'-ones
由若丹宁设计合成了一系列新型的双亲电子的β,γ-不饱和α-酮酸酯。在手性方酰胺的催化下,开发了这些新型酮酯与吡唑啉酮的对映体选择性[3 + 3]环化反应。该反应提供了一种有效的手性2'-thioxo-5,6-dihydrospiro [pyrano [2,3-c] pyrazole-4,5'-thiazolidin] -4'-ones的合成方法。