Catalyst-free synthesis of spiropyrazolines from chalcones and cyclic ketone N -tosylhydrazones
Treatment of cyclic ketone N-tosylhydrazones with chalcones in the presence of cesium carbonate at 110 °C affords spiropyrazolines with high selectivity and excellent yields. This protocol possesses many advantages such as readily available and stable sta
Preparation of unsymmetrical ketones from tosylhydrazones and aromatic aldehydes via formyl C-H bond insertion
Preparation of ketones by insertion of diazo compounds into the formyl C-H bond of an aldehyde is an attractive procedure, but use of structurally diverse diazo compounds is hampered by preparation and safety issues. A convenient procedure for the synthesis of unsymmetrical ketones from bench-stable tosylhydrazones and aryl aldehydes is reported. The procedure can be performed in one pot from the parent carbonyl compound and needs only a base, with no additional promoters being required.
Allwood, Daniel M.,Blakemore, David C.,Ley, Steven V.
supporting information
p. 3064 - 3067
(2014/06/23)
Tosylhydrazines by the Reduction of Tosylhydrazones with Triethylsilane in Trifluoroacetic Acid
Tosylhydrazines were easily prepared by the reduction of tosylhydrazones with triethylsilane in the presence of trifluoroacetic acid.
Wu, Pei-Lin,Peng, Shao-Yu,Magrath, Joe
p. 249 - 252
(2007/10/03)
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