Cross-Coupling of Triallyl(aryl)silanes with Aryl Bromides and Chlorides: An Alternative Convenient Biaryl Synthesis
作者:Akhila K. Sahoo、Takuro Oda、Yoshiaki Nakao、Tamejiro Hiyama
DOI:10.1002/adsc.200404188
日期:2004.12
give various biaryls in good yields. It is worthwhile to note that the all-carbon-substituted arylsilanes, stable towards moisture, acid, and base and easily accessible, serve as a highly practical alternative to their aryl(halo)silane counterparts. A catalyst system consisting of [(η3-C3H5)PdCl]2 and 2-[2,4,6-(i-Pr)3C6H2]-C6H4PCy2 and use of TBAF⋅3 H2O in THF-H2O are effective especially for the cross-coupling
在DMSO-H 2 O中存在PdCl 2 / PCy 3和氟化四丁基铵(TBAF)的情况下,多种芳基溴化物与三烯丙基(芳基)硅烷的交叉偶联是有效的,以高收率得到各种联芳基。值得一提的是,全碳取代的芳基硅烷对水分,酸和碱稳定,易于获得,可作为其芳基(卤代)硅烷对应物的高度实用替代品。由[(η的催化剂体系3 -C 3 H ^ 5)的PdCl] 2和2- [2,4,6-(我-Pr)3 c ^ 6 ħ 2 ] -C 6 H ^ 4 PCY2和在THF-H 2 O中使用TBAF·3 H 2 O对于与芳基氯的交叉偶联特别有效。两种催化剂体系均能耐受多种常见的官能团。推测反应的高效率归因于用TBAF·3 H 2 O和适量的水处理后烯丙基的易裂解。二烯丙基(二苯基)硅烷还可以与各种芳基溴化物和氯化物交联,收率很高,而烯丙基(三苯基)硅烷只能以中等收率得到交联产物。通过溴氯苯与不同芳基硅烷的顺序交叉偶联,可
The catalytic asymmetric creation of silanes with silicon stereocenters is a long‐sought but underdeveloped topic, and only a handful of examples have been reported. Moreover, the construction of chiral silanes containing (more than) two stereocenters is a more arduous task and remains unexploited. We herein report an unprecedented copper‐catalyzed desymmetrizing protoboration of divinyl‐substituted
Enantioselective Synthesis of Silicon‐Stereogenic Monohydrosilanes by Rhodium‐Catalyzed Intramolecular Hydrosilylation
作者:Yu‐Hao Huang、Yichen Wu、Zile Zhu、Sujuan Zheng、Zihang Ye、Qian Peng、Peng Wang
DOI:10.1002/anie.202113052
日期:2022.1.3
An intramolecularhydrosilylation strategy was developed for the asymmetric synthesis of chiral monohydrosilanes. This protocol is suitable for the synthesis of dihydrobenzosilole-, tetrahydrobenzosiline- and oxatetrahydrobenzosiline-based monohydrosilanes with excellent diastereo-, regio-, and enantioselectivities. Notably, the catalyst loading could be reduced to 0.1 mol %.
The reaction of organotrichlorosilanes with acetic acid in acetic anhydride forming organodichloroacetoxysilanes was investigated kinetically by means of 1H-NMR spectroscopy. It was found that the reaction takes place exclusively with the acetic anhydride under the conditions used. The ϱ-value of the reaction was found to be 1.8 and the δ-value to be 1.2. A reaction mechanism is proposed.