Visible light-promoted synthesis of pyrrolidinone derivatives <i>via</i> Rose Bengal as a photoredox catalyst and their photophysical studies
作者:Arup Dutta、Mostofa A. Rohman、Ridaphun Nongrum、Aiborlang Thongni、Sivaprasad Mitra、Rishanlang Nongkhlaw
DOI:10.1039/d1nj00343g
日期:——
Herein, we report an intramolecular radical cyclization reaction towards the synthesis of pyrrolidinone derivatives via metal-free photoredox catalysis under irradiation from blue LEDs. Some of the remarkable features of this protocol include synthetic efficiency, green reaction profile, easy isolation of products and short reaction time. The photophysical properties of synthesized compounds were investigated
Highly functionalized pyrrolidine-2,3-diones can be synthesized efficiently and stereoselectively under mild conditions using a biocatalytic approach. The reaction led to the formation of new all-carbon quaternary stereocenters from Myceliophthora thermophila laccase (Novozym 51003) catalyzed oxidation of catechols to ortho-quinones and subsequent 1,4-addition with 3-hydroxy-1,5-dihydro-2H-pyrrol-2-ones
高度功能化的吡咯烷-2,3-二酮可以在温和条件下使用生物催化方法高效且立体选择性地合成。该反应导致嗜热毁丝霉漆酶 (Novozym 51003) 形成新的全碳季立体中心,催化儿茶酚氧化为邻苯二酚,随后与 3-hydroxy-1,5-dihydro-2 H -进行 1,4-加成反应吡咯-2-一。该反应是在两种反应物上使用不同的取代基进行的,产生了 13 种中等至良好产率 (42–91%) 的产物。同样的 15 个反应也用 K 3 Fe(CN) 6作为催化剂进行了测试,但这里只有一个反应产生了产物(60% 收率)。