Functionalization of Tetraorganosilanes and Permethyloligosilanes at a Methyl Group on Silicon via Iridium-Catalyzed C(sp3)–H Borylation
摘要:
In the presence of an iridium 3,4,7,8-tetramethyl-1,10-phenanthroline catalyst, a methyl group on the silicon atom of alkyltrimethylsilanes undergoes selective C-H borylation with bis(pinacolato)diboron in cyclooctane at 135 degrees C to give alkyl(borylmethyl)dimethylsilanes. The C-H borylation of tetramethylsilane takes place efficiently at 100 degrees C. Permethyloligosilanes can also undergo C-H borylation without cleavage of the Si-Si bonds.
Utilization of a Trimethylsilyl Group as a Synthetic Equivalent of a Hydroxyl Group via Chemoselective C(sp<sup>3</sup>)–H Borylation at the Methyl Group on Silicon
chemoselective C(sp3)–H borylation of the methyl group on silicon. The (borylmethyl)silylgroup formed by C(sp3)–H borylation is treated with H2O2/NaOH, and the resulting (hydroxymethyl)silylgroup is converted into a hydroxyl group by Brook rearrangement, followed by oxidation of the resulting methoxysilyl group under Tamao conditions. An alternative route proceeding through the formylsilyl group formed from
基于铱催化的硅上甲基的化学选择性C(sp 3)-H硼化,可将三甲基甲硅烷基烷烃转化为相应的醇。用H 2 O 2处理由C(sp 3)–H硼化形成的(硼甲基)甲硅烷基然后,在Tamoo条件下,将所得的(羟甲基)甲硅烷基通过布鲁克重排转化为羟基,然后将所得的甲氧基甲硅烷基氧化。还建立了通过Swern氧化通过由(羟甲基)甲硅烷基形成的甲硅烷基甲硅烷基进行的替代途径。该方法适用于取代的三甲基甲硅烷基环烷烃和1,1-二甲基-1-硅环戊烷,以转化成相应的立体定义的环烷基醇和1,4-丁二醇。
Functionalization of Tetraorganosilanes and Permethyloligosilanes at a Methyl Group on Silicon via Iridium-Catalyzed C(sp<sup>3</sup>)–H Borylation
In the presence of an iridium 3,4,7,8-tetramethyl-1,10-phenanthroline catalyst, a methyl group on the silicon atom of alkyltrimethylsilanes undergoes selective C-H borylation with bis(pinacolato)diboron in cyclooctane at 135 degrees C to give alkyl(borylmethyl)dimethylsilanes. The C-H borylation of tetramethylsilane takes place efficiently at 100 degrees C. Permethyloligosilanes can also undergo C-H borylation without cleavage of the Si-Si bonds.
Catalytic Functionalization of Methyl Group on Silicon: Iridium-Catalyzed C(sp<sup>3</sup>)–H Borylation of Methylchlorosilanes
A methylgroup of methylchlorosilanes undergoes C-H borylation in an iridium-catalyzed reaction with bis(pinacolato)diboron in cyclohexane at 80 °C, giving (borylmethyl)chlorosilanes selectively.
在 80 °C 的环己烷中,甲基氯硅烷的甲基与双(频哪醇)二硼在铱催化反应中发生 CH 硼酰化,从而选择性地生成(硼基甲基)氯硅烷。