Silylarene Hydrogenation: A Strategic Approach that Enables Direct Access to Versatile Silylated Saturated Carbo‐ and Heterocycles
作者:Mario P. Wiesenfeldt、Tobias Knecht、Christoph Schlepphorst、Frank Glorius
DOI:10.1002/anie.201804124
日期:2018.7.2
by arene hydrogenation. The scope includes alkoxy‐ and halosilyl substituents. Silyl groups can be derivatized into a plethora of functionalities and find application in organic synthesis, materials science, and pharmaceutical, agrochemical, and fragrance research. However, silylated saturated (hetero‐ ) cycles are difficult to access with current technologies. The yield of the hydrogenation depends
我们报告了一种通过芳烃加氢将易得的甲硅烷基化芳烃转化为甲硅烷基化饱和碳和杂环的方法。范围包括烷氧基和卤代甲硅烷基取代基。甲硅烷基可被衍生为多种功能,并在有机合成,材料科学以及制药,农业化学和香料研究中得到应用。但是,目前的技术很难获得甲硅烷基化的饱和(杂)循环。氢化的产率取决于硅胶添加剂的量。这种二氧化硅效应还可以显着改善以前公开的高度氟化芳烃的氢化方法(例如,氢化至全顺式C 6 H 6 F 6)。
Ambient-Temperature Cobalt-Catalyzed Cycloaddition Strategies to Aromatic Boronic Esters
作者:Anne-Laure Auvinet、Joseph P. A. Harrity、Gerhard Hilt
DOI:10.1021/jo1004907
日期:2010.6.4
The room-temperature cobalt-catalyzed [4 + 2] cycloaddition of alkynylboronates and 1,3-dienes provides a convenient and general method for the synthesis of benzene-based aromatic boronicesters. Two complementary aromatization strategies involving in situ elimination and DDQ oxidation were explored, with the latter finding more generality. Finally, the potential of this technique to generate highly
We report the first Co-catalyzed borylation of aryl halides and pseudohalides with bis(pinacolato)diboron (B(2)pin(2)). The synthesis of two new Co(II) complexes of oxazolinylferrocenylphosphine ligands is described. Upon activation with LiMe, the Co complex catalyzes the borylation reactions of aryl bromides, iodides, sulfonates, 0arenediazonium salts, and even aryl chlorides under mild conditions, providing the borylated products in excellent to moderate yields and with high functional group tolerance.
Access to C(sp3) borylated and silylated cyclic molecules: hydrogenation of corresponding arenes and heteroarenes
作者:Arzoo Chhabra、Sabrina Reich、Timothy M. Shannon、Robert E. Maleczka、Milton R. Smith
DOI:10.1039/d4ra00491d
日期:——
Readily available and bench stable catalyst. Tolerates a variety of functional groups including orthogonal functionality. Circumvents the limitations of sp3 C–H borylation.