Heterogeneous enantioselective hydrogenation of 2-pyrones over cinchona-modified palladium
作者:Wolf-Rüdiger Huck、Tamas Mallat、Alfons Baiker
DOI:10.1039/b108944g
日期:2002.1.24
Asymmetric hydrogenation of 4-alkoxy and 4-methyl derivatives of 2-pyrones to the corresponding dihydro- or tetrahydropyrones over cinchona-modified Pd/TiO2 is fast under ambient conditions and affords good yields and high ee. cis-Tetrahydropyrones are obtained with 98–99% de. The ee can be further increased by kinetic resolution.
不对称 氢化在环境条件下,在金鸡纳改性的Pd / TiO 2上2-吡喃酮的4-烷氧基和4-甲基衍生物转化为相应的二氢-或四氢吡喃酮是快速的并且提供了良好的产率和高ee。顺式-四氢吡喃酮的de含量为98-99%。ee可以通过动力学拆分进一步提高。