Palladium-Catalyzed Cross-Coupling of Stereospecific Potassium Cyclopropyl Trifluoroborates with Aryl Bromides
作者:Guo-Hua Fang、Zheng-Jun Yan、Min-Zhi Deng
DOI:10.1021/ol036184e
日期:2004.2.1
excess KHF(2) afforded the corresponding potassium cyclopropyl trifluoroborates in high yields, which then underwent Suzuki-Miyaura cross-coupling reactions with aryl bromides to give cyclopropyl-substituted arenes in good yields with retention of configuration. This promises to be a useful method for the synthesis of enantiomerically pure cyclopropanes.
Suzuki−Miyaura Cross-Coupling Reactions of Potassium Alkenyltrifluoroborates
作者:Gary A. Molander、Carmem R. Bernardi
DOI:10.1021/jo026236y
日期:2002.11.1
that the palladium-catalyzedcross-couplingreaction of air-stable potassium alkenyltrifluoroborates with aryl halides and triflates proceeds readily with good yields. Recent progress in outlining the scope and limitations of such reactions is described herein. The palladium-catalyzedcross-couplingreaction of potassium alkenyltrifluoroborates with aryl and heteroaryl halides and triflates proceeds
Pinene-Derived Iminodiacetic Acid (PIDA): A Powerful Ligand for Stereoselective Synthesis and Iterative Cross-Coupling of C(sp<sup>3</sup>) Boronate Building Blocks
作者:Junqi Li、Martin D. Burke
DOI:10.1021/ja205912y
日期:2011.9.7
Efficient access to chiral C(sp3) boronates in stereochemically pure form is critical for realizing the substantial potential of such buildingblocks in complex-molecule synthesis. We herein report that a pinene-derived iminodiacetic acid (PIDA) ligand enables the highly diastereoselective synthesis of a wide range of oxiranyl C(sp3) boronates from the corresponding olefins. These oxiranyl PIDA boronates
有效获取立体化学纯形式的手性 C(sp3) 硼酸酯对于实现此类构建块在复杂分子合成中的巨大潜力至关重要。我们在此报告蒎烯衍生的亚氨基二乙酸 (PIDA) 配体能够从相应的烯烃中高度非对映选择性地合成各种环氧乙烷基 C(sp3) 硼酸酯。反过来,这些环氧乙烷基 PIDA硼酸酯可以通过硼酸酯基团的新型 1,2-迁移很容易地转化为前所未有的稳定的 α-硼醛,该迁移可以完全保持立体化学纯度。含有双 sp3 杂化 C 中心的 B 保护卤硼酸可通过该平台轻松访问,
Development and Application of a Direct Vinyl Lithiation of <i>cis</i>-Stilbene and a Directed Vinyl Lithiation of an Unsymmetrical <i>cis</i>-Stilbene
作者:Juliet Cotter、Anne-Marie L. Hogan、Donal F. O'Shea
DOI:10.1021/ol070239l
日期:2007.4.1
1-lithio-1,2-diphenylethene undergoes an in situ Z-to-E isomerization, and subsequent reaction with electrophiles results in an efficient stereoselective synthesis of trisubstituted alkenes. A directed vinyl lithiation of the unsymmetrical cis-stilbene 2-styryl-phenyl-carbamic acid tert-butyl ester can be achieved regioselectively, thereby expanding this methodology for further synthetic applications in