Enantioenriched aldehydes are produced through asymmetric hydroformylation of styrene derivatives using BIBOP-type ligands. The featured example is enantioselective synthesis of 4-methyl-3,4-dihydroisocoumarin, which was prepared in a 95.1:4.9 enantiomeric ratio from asymmetric hydroformylation of ethyl 2-vinylbenzoate followed by in situ lactonization during the reduction process. The conditions are
使用BIBOP型
配体通过
苯乙烯衍
生物的不对称加氢甲酰化制得对映体丰富的醛。典型的例子是4-甲基-3,4-二氢异
香豆素的对映选择性合成,该合成是通过
2-乙烯基苯甲酸乙酯的不对称加氢甲酰化,然后在还原过程中进行原位内酯化而以95.1:4.9的对映体比例制备的。该条件与富电子和贫电子的取代基均相容。