Enantiomeric phosphonate analogs of the paclitaxel C-13 side chain
摘要:
Both enantiomers of syn diethyl 2-(benzoylamino)-1-hydroxy-2-phenylethylphosphonate have been obtained by resolution via O-methylmandelate derivatives. Removal of the resolving ester moiety was easily achieved by ammonolysis with no trace of the retro-Abramov reaction. Absolute configurations of the enantiomeric phosphonate analogs were established from H-1 (the Trost model) and P-31 NMR data of the O-methylmandelate derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved.
Selective Sulfonylation of Arenes and Benzoylation of Alcohols Using Lithium Perchlorate as a Catalyst Under Neutral Conditions
作者:B. P. Bandgar、V. T. Kamble、V. S. Sadavarte、L. S. Uppalla
DOI:10.1055/s-2002-25345
日期:——
Sulfonylation of aromatics with p-toluenesulfonyl chloride and benzoylation of alcohols with benzoyl chloride using lithium perchlorate as a catalyst is described. The remarkable selectivity under neutral conditions is an attractive feature of this method
Organocatalytic selective benzoylation of alcohols with trichloromethyl phenyl ketone: inverse selectivity in benzoylation of alcohols containing phenol or aromatic amine functionality
作者:Ram N. Ram、Vineet Kumar Soni、Dharmendra Kumar Gupta
DOI:10.1016/j.tet.2012.08.051
日期:2012.11
organocatalyst at room temperature in high yields and excellent selectivity. It also shows the potential to selectively benzoylate primary alcoholic groups of aminoarylalkanols and primary-secondary diols as well as primary amino group of alkyl amines in the presence of aryl amines under similar conditions. A rationale for the selectivity and efficiency of the reaction has been provided.