Synthesis and Suzuki-Miyaura Cross-Coupling of Enantioenriched Secondary Potassium β-Trifluoroboratoamides: Catalytic, Asymmetric Conjugate Addition of Bisboronic Acid and Tetrakis(dimethylamino)diboron to α,β-Unsaturated Carbonyl Compounds
作者:Gary A. Molander、Steven R. Wisniewski、Mona Hosseini-Sarvari
DOI:10.1002/adsc.201300640
日期:2013.10.11
Enantioenriched potassium beta-trifluoroboratoamides have been synthesized via an asymmetric, copper-catalyzed 1,4-addition of tetrahydroxydiboron (BBA) and tetrakis(dimethylamino)diboron to alpha,beta-unsaturated amides. These dibora reagents provide access to the desired organotrifluoroborates using effective and atom economical sources of boron. The copper-catalyzed beta-boration is extended to
Enantioenriched 钾β-trifluoroboratoamides 已通过不对称、 铜催化1,4-加成四羟基二硼(BBA) 和四(二甲氨基) 二硼合成α,β-不饱和酰胺。这些二硼试剂使用有效且原子经济的硼源提供了获得所需有机三氟硼酸盐的途径。铜催化的 β-硼酸化扩展到 α,β-不饱和酮和酯。合成的有机三氟硼酸钾的产率高达 92%,对映体比例高达 98:2。当金属转移通过 SE2 机制通过开放过渡态进行时,富含对映体的 β-三氟硼酰胺钾与一系列芳基和杂芳基氯化物成功交叉偶联,具有完全立体化学保真度。