We have successfully developed the asymmetric hydrogenation of β‐silyl‐α,β‐unsaturatedesters to prepare chiral 3‐substituted‐3‐silylpropionic esterproducts catalyzed by rhodium/bisphosphine‐thiourea (ZhaoPhos) with excellent results (up to 97% yield, >99% ee, 1500 TON). Moreover, our hydrogenation products can be efficiently converted to other important organic molecules, such as chiral ethyl (R
Copper(II)-Catalyzed Silylation of Activated Alkynes in Water: Diastereodivergent Access to<i>E</i>- or<i>Z</i>-β-Silyl-α,β-Unsaturated Carbonyl and Carboxyl Compounds
作者:Joseph A. Calderone、Webster L. Santos
DOI:10.1002/anie.201310695
日期:2014.4.14
Copper(II)‐catalyzed silylation of substituted alkynylcarbonyl compounds was investigated. Through the activation of Me2PhSiBpin in water at room temperature and open atmosphere, vinylsilanes conjugated to carbonyl groups are synthesized in high yield. A surprising diastereodivergent access to olefin geometry was discovered using a silyl conjugate addition strategy: aldehydes and ketones were Z selective
研究了铜(II)催化的取代炔基羰基化合物的硅烷化反应。通过在室温和开放气氛下在水中活化 Me 2 PhSiBpin,可以高产率合成与羰基共轭的乙烯基硅烷。使用甲硅烷基共轭加成策略发现了对烯烃几何形状的惊人非对映发散途径:醛和酮具有 Z 选择性,而酯和酰胺仅转化为E 产物。
Synthesis of multi-substituted vinylsilanes via copper(<scp>i</scp>)-catalyzed hydrosilylation reactions of allenes and propiolate derivatives with silylboronates
作者:Yun-He Xu、Liu-Hai Wu、Jun Wang、Teck-Peng Loh
DOI:10.1039/c4cc01722f
日期:——
An efficient and general copper(i)-catalyzed method for the synthesis of multi-substituted vinylsilanes is reported.
entry to the corresponding β-silylenamides and -acrylates, which were formed with high levels of regio- and stereoselectivities. A highly efficient catalytic silylcupration of activated alkynes is reported. Upon reaction with silylboronates and methanol in THF at room temperature in the presence of copper(I) fluoride tris(triphenylphosphine), a range of ynamides and propiolates were found to undergo a