A facile synthesis of homochiral 1-norbornanecarboxylic acids and 1-norbornanecarbonitriles
摘要:
A general method for the preparation of the title compounds from naturally occurring homochiral 2-norbornanones is presented. The key step is the Tf(2)O induced Wagner-Meerwein rearrangement of the corresponding cyanohydrins.
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
A Convenient Catalytic Procedure for the Addition of Trimethylsilyl Cyanide to Functionalised Ketones, Mediated by InBr3 − Insight into the Reaction Mechanism
作者:Marco Bandini、Pier Giorgio Cozzi、Andrea Garelli、Paolo Melchiorre、Achille Umani-Ronchi
This paper describes a useful and practical methodology for the addition of trimethylsilyl cyanide (TMSCN) to a large variety of functionalised and unfunctionalised ketones in the presence of catalytic amounts of anhydrous InBr3. The optimum procedure involves low catalyst loading (1 mol %) and appears general in scope and applicability for aromatic and aliphatic ketones. The desired cyanohydrins were
P(RNCH2CH2)N: efficient catalysts for the cyanosilylation of aldehydes and ketones
作者:Brandon M. Fetterly、John G. Verkade
DOI:10.1016/j.tetlet.2005.09.032
日期:2005.11
The 1,2-addition of trialkylsilylcyanides to aldehydes and ketones produces the corresponding protected cyanohydrins in good to excellent yields when carried out at 0 degrees C to room temperature in the presence of catalytic amounts of the nonionic strong base P(RNCH2CH2)N (R = Me, i-Pr) in THF. These catalysts are easily removed from the product by hydrolysis or column filtration through silica gel. (c) 2005 Published by Elsevier Ltd.
P(MeNMCH2CH2)3N: an effective catalyst for trimethylsilycyanation of aldehydes and ketones
作者:Zhigang Wang、Brandon Fetterly、John G Verkade
DOI:10.1016/s0022-328x(01)01436-x
日期:2002.3
The title non-ionic phosphazane base promotes the trimethylsilycyanation of aryl and alkyl aldehydes and ketones in moderate to high yields at room temperature. 29Si-NMR spectral evidence for the intermediacy of a phosphazane phosphorus–silicon adduct is presented.
A facile synthesis of homochiral 1-norbornanecarboxylic acids and 1-norbornanecarbonitriles
作者:A.Garcá Martínez、E.Teso Vilar、A.García Fraile、S. de la Moya Cerero、J.M.González-Fleitas de Diego、L.R. Subramanian
DOI:10.1016/0957-4166(94)80130-4
日期:1994.8
A general method for the preparation of the title compounds from naturally occurring homochiral 2-norbornanones is presented. The key step is the Tf(2)O induced Wagner-Meerwein rearrangement of the corresponding cyanohydrins.