124988-44-9Relevant articles and documents
Stereoretentive halogenations and azidations with titanium(IV) enabled by chelating leaving groups
Lepore, Salvatore D.,Mondal, Deboprosad,Song, Ye Li,Bhunia, Anjan K.
supporting information; body text, p. 7511 - 7514 (2009/03/12)
Titaniumdoes it again! With the help of nucleophile-assisting leaving groups (NALGs), alkyl bromides, iodides, and, for the first time, azides are obtained from sulfonates withcomplete retention of configuration. Critical to the design of these new titanium(IV) reactions has been the use of NALGs which are thought to chelate the Lewis acid reagent in the transition state promoting an SNi-type mechanism. (Chemical Equation Presented)
CsF in organic synthesis. Inversion of secondary mesylates and tosylates
Otera, Junzo,Nakazawa, Koichi,Sekoguchi, Koichi,Orita, Akihiro
, p. 13633 - 13640 (2007/10/03)
Clean inversion of secondary mesylates and tosylates is effected by CsF in DMF. A variety of oxygen-, sulfur-, nitrogen-, and carbon-nucleophiles are employable. The reaction conditions have been optimized. The use of CsF in DMF is crucial and the reaction proceeds on the surface of solid CsF. It is suggested that hydrogen bonding between CsF and an active hydrogen of nucleophiles is responsible for the smooth reaction. Cesium carbonate fails to give rise to high specificity of inversion indicative of superiority of CsF.
Direct Conversion of Activated Alcohols to Azides Using Diphenyl Phosphorazidate. A Practical Alternative to Mitsunobu Conditions
Thompson, Andrew S.,Humphrey, Guy R.,DeMarco, Anthony M.,Mathre, David J.,Grabowski, Edward J. J.
, p. 5886 - 5888 (2007/10/02)
Fourteen alcohols were converted to their corresponding azides with inversion of configuration using diphenyl phosphorazidate and DBU.
Zinc Azide Mediated Mitsunobu Substitution. An Expedient Method for the One-Pot Azidation of Alcohols
Viaud, Marie Claude,Rollin, Patrick
, p. 130 - 132 (2007/10/02)
In the presence of the diisopropyl azodicarboxylate/triphenylphosphine couple, alcohols react with zinc azide/bis-pyridine complex to give various azides via a Mitsunobu-type substitution.
Preparation of amino acid derivatives
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, (2008/06/13)
A hydroxy-carboxylate ester is converted to an amino-acid-amide by replacement of the --OH group with --N3, via, e.g., CH3 SO2 Cl and NaN3 ; reacting with amine to convert the ester to amide; and hydrogenating --N3 to --NH2. The present process alleviates the conventional use of blocking-deblocking procedures.