Activation of Si-Si Bonds for Copper(I)-Catalyzed Conjugate Silylation
作者:Laura Iannazzo、Gary A. Molander
DOI:10.1002/ejoc.201200767
日期:2012.9
silylation of α,β-unsaturated compounds. Optimal reaction conditions were first investigated to realize the conjugate addition of a nucleophilic silicon species to poorly electrophilic acceptors such as phenylvinyl sulfone by cleavage of the Si-Si bond of a disilane reagent. The scope of this reaction was extended to various electrophiles bearing different electron-withdrawing groups and afforded the
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。
Stereoselective Silylcupration of Conjugated Alkynes in Water at Room Temperature
作者:Roscoe T. H. Linstadt、Carl A. Peterson、Daniel J. Lippincott、Carina I. Jette、Bruce H. Lipshutz
DOI:10.1002/anie.201311035
日期:2014.4.14
Micellar catalysis enables copper‐catalyzed silylcupration of a variety of electron‐deficient alkynes, thereby providing access to isomerically pure E‐ or Z‐β‐silyl‐substituted carbonyl derivatives. These reactions take place in minutes, afford high yields and stereoselectivity, and are especially tolerant of functional groups present in the substrates. The aqueous reaction medium has been successfully
Asymmetric Conjugate Addition of Grignard Reagents to 3-Silyl Unsaturated Esters for the Facile Preparation of Enantioenriched β-Silylcarbonyl Compounds and Allylic Silanes
作者:Kai Zhao、Teck-Peng Loh
DOI:10.1002/chem.201403849
日期:2014.12.8
deliver synthetically useful chiral β‐silylcarbonyl compounds was developed. The synthetic value of this methodology was further illustrated by the synthesis of enantioenriched β‐hydroxyl esters and the facile access granted to various α‐chiral allylicsilanes. A plethora of diastereoselective transformations of β‐silylenolates were also investigated and afforded manifold organosilanes that contained contiguous
Carbon−Carbon Bond-Forming Enantioselective Synthesis of Chiral Organosilicon Compounds by Rhodium/Chiral Diene-Catalyzed Asymmetric 1,4-Addition Reaction
作者:Ryo Shintani、Kazuhiro Okamoto、Tamio Hayashi
DOI:10.1021/ol051978+
日期:2005.10.1
new syntheticmethod for chiral organosilicon compounds through a rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to beta-silyl alpha,beta-unsaturated carbonyl compounds has been developed. By employing (R,R)-Bn-bod* as a ligand, a range of arylboronic acids can be coupled with these substrates in very high enantiomeric excess. The resulting beta-silyl 1,4-adducts can be converted to