A New Lithium Alkoxide Accelerated Diastereoselective Cyanation of Ketones
作者:H. Scott Wilkinson、Paul T. Grover、Charles P. Vandenbossche、Roger P. Bakale、Nandkumar N. Bhongle、Stephen A. Wald、Chris H. Senanayake
DOI:10.1021/ol0069608
日期:2001.2.1
lithium heteroatom assisted TMSCN or TBSCN addition to aldehydes and ketones has been discovered. The process provides excellent selectivities and high rates. Conformationally constrained ketones such as camphor, fenchone, and nopinone give excellent diastereoselectivities with TMSCN. Reduction of 2 provided diastereopure amino alcohol 3 in good yield. alpha- and beta-Methyl cyclohexanones with TBSCN-LiOR
Lewis Acid Rather than Brønsted Acid Sites of Montmorillonite K10 Act as a Powerful and Reusable Green Heterogeneous Catalyst for Rapid Cyanosilylation of Ketones
A practical green protocol was developed for highlyefficientcyanosilylation of various ketonescatalyzed by commercial montmorillonite K10, with excellent isolated yields (91–99%). The catalyst can be used as received, and its catalytic strength can be easily restored without loss of activity. Investigations of catalyst recycling and of the active catalytic sites indicated that Lewis acid sites were
Calcined MgAICO<sub>3</sub>-HT Catalysed Cyanosilylation of Carbonyl Compounds and Nucleophilic Ring Opening of Oxiranes Using TMSCN
作者:B. M. Choudary、N. Narender、V. Bhuma
DOI:10.1080/00397919508011830
日期:1995.9
Nucleophilic addition of TMSCN to carbonyl compounds is found to be catalysed efficiently using hydrotalcite as a solid base. The catalyst is also found to be active in the nucleophilicringopening of oxiranes giving high regioselectivity.
Neutral π-Nucleophile-Catalyzed Cyanation of Aldehydes and Ketones
作者:Shi-Kai Tian、Xiu Wang
DOI:10.1055/s-2007-980366
日期:2007.6
1-Methoxy-2-methyl-1-(trimethylsiloxy)propene, a neutral Ï-nucleophile, was found to be able to efficiently catalyze the cyanation (cyanosilylation and cyanocarbonation) of various aldehydes and ketones, and this study provided the first illustration of using a neutral Ï-nucleophile for the development of synthetically useful organocatalysis.
Reaction of cyanotrimethylsilane with various carbonyl compounds was effectively catalyzed by Yb(CN)3 to give the adducts in excellent yields; reaction with substituted cyclohexanones proceeded in a highly stereoselective manner.