Asymmetric Hydrogenation of 2,4-Dioxo Esters: Selective Synthesis of 2-Hydroxy-4-oxo Esters and Direct Access to Chiral 2-Hydroxy-4-butyrolactones
作者:Véronique Blandin、Jean-François Carpentier、André Mortreux
DOI:10.1002/(sici)1099-0690(199908)1999:8<1787::aid-ejoc1787>3.0.co;2-o
日期:1999.8
2,4-Dioxoesters 1a–c are selectively converted into optically active 2-hydroxy-4-oxoesters 2a–c by hydrogenation with chiral rhodium-aminophosphane-phosphinite catalysts (82–88% ee) or ruthenium-bisphosphane catalysts (52–67% ee). Direct one-pot hydrogenation of 2,4-dioxoesters 1a–c to 2-hydroxy-4-butyrolactones 4a–c proceeds in high yields; catalytic activities, chemo-, dia-, and enantioselectivities
2,4-二氧代酯 1a-c 通过手性铑-氨基膦-次膦酸催化剂(82-88% ee)或钌-双膦催化剂(52-67)的氢化反应选择性地转化为光学活性的 2-羟基-4-氧代酯 2a-c % ee)。2,4-二氧代酯 1a-c 直接一锅加氢生成 2-羟基-4-丁内酯 4a-c,收率高;催化活性、化学选择性、渗析选择性和对映选择性在很大程度上取决于底物和催化剂的性质。