Catalytic cyanomethylation of various carbonyl compounds with (trimethylsilyl)acetonitrile (TMSCH2CN) in the presence of Lewis bases such as cesium or lithium acetate proceeded smoothly to afford t...
A Robust Nickel Catalyst for Cyanomethylation of Aldehydes: Activation of Acetonitrile under Base-Free Conditions
作者:Sumit Chakraborty、Yogi J. Patel、Jeanette A. Krause、Hairong Guan
DOI:10.1002/anie.201302613
日期:2013.7.15
room temperature coupling of aldehydes with acetonitrile under base‐free conditions. The catalytic system is long‐lived and remarkably efficient with high turnover numbers (TONs) and turnover frequencies (TOFs) achieved. The mild reaction conditions allow a wide variety of aldehydes, including base‐sensitive ones, to catalytically react with acetonitrile.
AN ALDOL-TYPE REACTION OF ACETONITRILES USING DIALKYLBORYL TRIFLATE
作者:Hiroshi Hamana、Tsutomu Sugasawa
DOI:10.1246/cl.1982.1401
日期:1982.9.5
Acetonitriles and benzaldehydes react in the presence of dialkyl boryl triflate and diisopropylethylamine in dichloromethane to give the corresponding aldol-type products in good yields under mild conditions.
Efficient Lipase-Catalyzed Kinetic Resolution and Dynamic Kinetic Resolution of β-Hydroxy Nitriles. Correction of Absolute Configuration and Transformation to Chiral β-Hydroxy Acids and γ-Amino Alcohols
Chemoenzymatic dynamickineticresolution of β-hydroxy nitriles 1 has been carried out using Candida antarctica lipase B and a ruthenium catalyst. The use of a hydrogen source to depress ketone formation in the dynamickineticresolution yields the corresponding acetates 2 in good yield and high enantioselectivity. It is shown that the ruthenium catalyst and the enzyme can be recycled when used in
Stereoselective aldol condensations of organotin reagents with aldehydes
作者:Sharada S. Labadie、J.K. Stille
DOI:10.1016/0040-4020(84)80016-2
日期:1984.1
reaction requiring isomerization of the C-Sn to the O-Sn enolate. The Pd catalyzed condensation of cyanomethyltributyltin with reactive aldehydes, such as nitrobenzaldehydes, took place at ambient temperatures in polar solvents to give high yields of condensation products. No reaction occurred with aldehydes such as benzaldehyde. Only low stereoselectivity (10-34% ee) was observed when (-) DIOP or (-)BPPM