Mild and Efficient Trimethylsilylcyanation of Ketones Catalysed by PNP Chloride
作者:Marie-Agnès Lacour、Nicolas J. Rahier、Marc Taillefer
DOI:10.1002/chem.201101195
日期:2011.10.24
Mild & green: The commercially and readily available PNPCl behaves as a very effective catalyst for the synthesis of various trimethylsilyl cyanohydrins from a wide range of aliphatic, cyclic, α,β‐unsaturated and aromatic ketones. The method proceeds at room temperature in solvent‐free conditions, in the presence of very small amounts of catalyst (see scheme).
revealed the formation of [VO2(CN)3]2- and [VO4TMS2]- under reaction conditions. The reaction of [VO2(CN)3]2-, trimethylsilyl cyanide (TMSCN), and water afforded [VO4TMS2]- and CN-, which reacted with ketones to yield the corresponding cyanohydrin trimethylsilyl ethers over [VO2(CN)3]2-. Compound [VO2(CN)3]2- showed high catalytic performance for cyanosilylation of various carbonyl compounds. In the case
Two aryl amino borinium cations derived from Cl(Mes)B-NR2 (NR2 = TMP, HMDS) faced divergent outcomes. As the HMDS-substituted one underwent methylmigration from silicon to boron transforming the putative borinium ion to a silylium ion, [Mes-B-TMP]+ can initiate cyanosilylation and catalyse hydrosilylation of ketones and aldehydes.
Sustainable organocatalytic cyanosilylation of ketones by PPM-level loading of triphenylcarbenium tetrakis(pentafluorophenyl)borate
作者:Muhammad Israr、Han Yong Bae
DOI:10.1039/d3gc00189j
日期:——
significant demand for sustainable homogeneous catalysis, the importance of efficient synthesis and simple purification of complex organic compounds is attracting attention. Herein, we report the cyanosilylation of ketones using tritylium tetrakis(pentafluorophenyl)borate ([Ph3C]+[B(C6F5)4]−) as an extremely active organocatalyst. The neutral, air- and moisture-tolerant nature of the solid salt is beneficial