diphosphane 17, was performed starting from (R)-camphor. The new diphosphanes were used as ligands in the enantioselective rhodium(I)-catalyzed hydrogenation of functionalized olefins − α- and β-dehydroamino acids and their esters − in order to elucidate the effect of the oxo- and oxy-functional groups. The enantioselectivities, ranging from 2−90% ee, and the rates were strongly dependent on the type and relative
从 (R)-
樟脑开始合成两个系列的非对映异构氧代和氧代
二膦 7a-9a 和 7b-9b,以及类似的非官能化
二膦 17。新的
二膦被用作对映选择性
铑(I)催化的官能化烯烃 - α- 和 β- 脱氢
氨基酸及其酯 - 的氢化中的
配体,以阐明氧-和氧-官能团的影响。对映选择性范围为 2-90% ee,并且速率很大程度上取决于催化剂中氧代或氧代取代基的类型和相对位置。给出了可能的影响解释。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)